Installation and Maintenance Manual IM-487-3 Group: Applied Systems Part Number: IM-487 Date: July 2002 RoofPak® Applied Rooftop Systems Air Handler RAH 047C - 077C 12,000 to 50,000 cfm (5663 to 23597 liters/second) RDS 800C - 802C 4,000 to 20,000 cfm (1888 to 9439 liters/second) © 2002 McQuay International IM-487 Page 1
Table of Contents Introduction .......................................................................... 3 Receiving Inspection .........................................................3 Hazard Identification Information .....................................3 Nomenclature ....................................................................3 Typical Component Locations ......................................... 4 Typical Unit Sections .......................................................
Introduction This manual provides general information about the "C" vintage McQuay RoofPak® applied rooftop unit, models RAH, and RDT. In addition to an overall description of the unit, it includes mechanical and electrical installation procedures, commissioning procedures, sequence of operation information, and maintenance instructions. For further information on the optional forced draft gas-fired furnace, refer to Bulletin No. IM 684 or IM 685.
Typical Component Locations Figure 1 shows a typical Blow-Through unit with the locations of the major components. Figure 2 on page 5 shows a typical Draw-Through unit with the locations of the major components. These figures are for reference only. See the certified submittals for actual specific dimensions. Figure 1.
Figure 2.
Figure 3.
Typical Unit Sections The individual sections that make up a rooftop can vary from unit to unit. All available sections are shown in Figure 4 and Figure 5. Figure 4.
Control Locations “Wiring Diagrams” on page 48. Figure 6 shows the blowthrough heat and blow-through coil sections. These sections are also available in the draw-through position. All controls mounted in the blow-through section would be located in the same position within the draw-through section. All controls are optional. If controls are ordered, Figure 6 shows the locations of various control components mounted throughout the unit.
Control Panel Locations The unit control panels and their locations are shown in the following figures. These figures show a typical unit configu- ration. Specific unit configurations may differ slightly from these figures depending on the particular unit options. Figure 7.
Figure 8. Main Control Panel Power Pack Only FB20 FB10 Note: See the wiring diagrams legend at the beginning of “Wiring Diagrams” on page 48 for designation /description.
Figure 9.
Figure 10. Electric Heat Control Panel TB11 Note: See the wiring diagrams legend at the beginning of “Wiring Diagrams” on page 48 for designation /description.
Controls, Settings, and Functions Table 2: Controls, settings and functions SYMBOL DESCRIPTION DAT Discharge air temperature sensor DHL Duct high limit switch EFT FS1 OAE FUNCTION RESET Senses discharge air N/A temperature. Prevents excessive VAV duct Auto pressures; shuts off fan. Entering fan air Senses entering fan air N/A temperature sensor temperature Freezestat Shuts off fans, opens heating Auto valve and closes outdoor damper if low air temperature at coil is detected.
Mechanical Installation The installation of this equipment shall be in accordance with the regulations of authorities having jurisdiction and all applicable codes. It is the responsibility of the installer to determine and follow the applicable codes. WARNING Sharp edges on sheet metal, screws and clips can cause personal injury. WARNING This equipment must be installed and operated only by experienced trained personnel. Sharp edges and coil surfaces can cause personal injury. Avoid contact with them.
Ventilation Clearance Overhead clearance Following are minimum ventilation clearance recommendations. The system designer must consider each application and provide adequate ventilation. If this is not done, the unit will not perform properly. 1. Unit(s) surrounded by screens or solid walls must have no overhead obstructions over any part of the unit. Unit(s) surrounded by a screen or a fence: 1. The bottom of the screen or fence should be at least 1 ft. (305 mm) above the roof surface. 2.
Roof Curb Assembly and Installation work to the curb before the unit is set. The gasketed top surface of the duct flanges seals against the unit when it is set on the curb. These flanges must not support the total weight of the ductwork. Refer to “Installing Ductwork” on page 22 for details on duct connections. Assembly of a typical RAH roof curb is shown in. Parts A through H are common to all units having bottom return openings.
Assembly Instructions: 1. Set curbing parts A thru H per dimensions shown over roof opening or on a level surface. Note location of return and supply air openings. 2. If applicable, set other curbing parts (D, L, M, etc.) in place making sure that the orientation agrees with the assembly instructions. Check alignment of all mating bolt holes. See Detail "A". 3. Bolt curbing parts together using fasteners provided. Tighten all bolts finger tight. 4.
Post and Rail Mounting mediate period, take these additional precautions: When mounting by post and rail, the structural support should run the full length of the unit. Locate the structural member at the base of the unit as shown in Figure 17. 1. Support the unit well along the length of the base rail. CAUTION The unit must be level side to side and over the entire length. Equipment damage can result if the unit is not level.
Lifting Points Use Table 3 & Table 4 and Figure 19 to determine lifting cable lengths and if four or six-pint lifting is required. Figure 19. Unit Type RAH Lifting Points 4 Lifting Points Refer to Figure 19 and note that dimension A is the distance between the outer lifting points. The four outer rigging cables must be equal to or longer than dimension A. Dimension B shows the minimum distance between the outer and the inner lifting points for six-point lifting.
Reassembly of Split Units Field reassembly of a unit shipped split at the fan takes place in two places: junction box, per the unit's electrical schematics. 1. Setting the sections and mechanically recoupling the cabinet. WARNING Connect the power block correctly and maintain proper phasing. 2. Reconnecting power and control wiring if optional power pack and/or controls are used.
Step 3. Caulk and install parts as shown in Figure 21. Step 4. Install Raceway Cover as shown in Figure 22. Figure 21. Reassembly of Split Units - Step 3 Figure 22. Reassembly of Split Units - Step 4 If applicable install as shown with fasteners provided. 3.72 ref.
Installing Ductwork On bottom-supply/bottom-return units, the installing contractor should make an airtight connection. Attach field fabricated duct collars to the bottom surface of either the roof curb's duct flange or the unit's duct opening if a McQuay roof curb is not used. Do not support the total weight of the ductwork from the unit or these duct flanges. Refer to Figure 23. Units with optional back return, side discharge, or end discharge (on RFS units) all have duct collars provided.
3. Locate the duct pressure (HI) tap near the end of a long duct to verify that all terminal box take-offs along the run will have adequate static pressure. Figure 25. Pressure Sensing Tubing Installation C o n d e n s e r S e c tio n M a in C o n tr o l P a n e l 4. Locate the duct tap in a nonturbulent flow area of the duct. Keep it several duct diameters away from take-off points, bends, neckdowns, attenuators, vanes, or other irregularities. 5.
Building Pressurization Applications 1. Install a "T" fitting with a leak-tight removable cap in each tube near the sensor. This will facilitate connecting a manometer or pressure gauge if testing is required. 2. Locate the building pressure (HI) tap in the area that re quires the closest control. Typically, this is a ground level floor that has doors to the outside. 3. Locate the building tap so that it is not influenced by any source of moving air (velocity pressure).
Figure 26. Condensate Drain Connection tion of interconnecting piping. The DX coil and condensing unit are intended to be set at the same elevation, as close as possible to each other to minimize refrigerant pressure drop. Design piping to prevent liquid refrigerant carryover to the compressor and to provide a continuous return of compressor oil from the system.
Leak Testing In the case of loss of the nitrogen holding charge, check the unit for leaks prior to charging the complete system. Leak testing must be done to current EPA standards and regulations. After making any necessary repair, evacuate the system as described in the following paragraphs. WARNING Do not use oxygen to build up pressure. Using oxygen to build up pressure can cause an explosion, resulting in severe personal injury or death.
into the condenser. Approximately 75% of the total requirement estimated for the unit can be charged in this manner. 4. After 75% of the required charge has entered the condenser, reconnect the refrigerant drum and charging line to the suction side of the system. Again purge the connecting line, stand the drum with the connection side up, and place the service valve in the open position.
Unit Piping Gas Piping See the "Installation" section of the gas-fired furnace installation manual, Bulletin No. IM 684 or 685. Figure 27. Valve Assembly Fuel Oil Piping See the "Installation" section of the gas-fired furnace installation manual, Bulletin No. IM 684 or IM 685. S te m Piping for Steam, Hot Water / ChIlled Water Coils Factory installed chilled water coils are installed in a coil section which may be designed to accept a factory installed heating coil immediately upstream.
Note: The valve actuator spring returns to a stem down position upon power failure. This allows full flow through the coil. Figure 28. Hot Water Heat Section (Shown with Factory Valve and Piping) Upper Coil 2.12 " ODM Copper Coil Connections Steam Piping to Coils in the Heat Section Steam coils are provided without valves for field piping, or piped with two-way valves and actuator motors.
2. Float and thermostatic or bucket traps are recommended for low pressure steam. Use bucket traps on systems with on-off control only. 3. Locate traps at least 12 inches (305 mm) below the coil return connection. 4. Always install strainers as close as possible to the inlet side of the trap. 5. A single trap may generally be used for coils piped in parallel, but an individual trap for each coil is preferred. Figure 31. Heating Coil Piping With Vestibule 4.
Table 10: Piping Connection Sizes / Valve Size Options For Chilled Water Piping Cabinet Size Application Code Coil Size Face Area H x 83" Sq. Ft. (2108 mm) (Sq. m) Long Blow-thru or Draw-thru Small Coil Section 33 + 33 (2 coils) (838 + 838 mm) 38.0 (3.53 m²) Blow-thru or Draw-thru Large Coil Section 39 + 39 (2 coils) (991 + 991 mm) 45.0 (4.18 m²) Face and Bypass Section With Small Coil 48 (1219 mm) 27.7 (2.57 m²) Face and Bypass Section With Large Coil 39 + 39 (2 coils) (991 + 991 mm) 45.0 (4.
Table 10 Available Circuiting Legend Column 1: These units are available with a factory installed package consisting of a three-way water valve and connecting piping. A = This combination is not available with a factory installed piping and valve package. B = 300, 2.50, or 200 inch three-way valves can be specified C = 300, 2.50, 2.00, or 150 inch three-way valves can be specified D = 250, 200, or 150 inch three-way valves can be specified E = 250, 200, 150, or 1.
Vestibule Assembly Instructions An accessory vestibule is available to provide additional piping space for coils installed in a four-foot section. A vestibule is required to maintain door access on a combination heating and cooling section. Assemble the vestibule to the unit part by part as shown in Figure 33. Note: Step 2 Remove gasketing around door flange and save for use on vestibule. See Step 4. Remove door and save for Step 4. Figure 34.
Step 3 1. Assemble side panels A and B to uprights using #10 drill screws supplied. Make certain side panels are flush against uprights before securing into place. 2. Fasten bottom panel D to base channel using #10 drill screws and to side panels A and B using #10 screws supplied. Step 4 1. Reassemble access door to vestibule by screwing hinges into side panel using screws saved from Step 1. (Access door must be attached to the vestibule in the same opening direction as it was on the unit.) 3.
Damper Assemblies The optional damper assemblies described in this section are provided with manually adjustable linkages, or may be shipped with factory installed actuators and linkages in units that include factory controls. Economizer Dampers Outside air intake is provided on both sides of the unit, and the return air path is at the center of the damper set. As the single actuator modulates the outside air dampers open, the return air dampers close.
Intake Hood Damper Intake Hood Damper (0 to 100% Outside Air, RAH 47-77 Only) (0 to 30% Outside Air) Units requiring 100% outside air are provided with a rain hood and dampers which may be controlled by a single actuator. The actuator, which may be ordered with factory controls, provides two position control for opening the dampers fully during unit operation and closing the dampers during the off cycle. No unit mounted exhaust dampers are provided.
Mixing Box (RAH 47-77 only) This section utilizes an outside air damper and a return air damper. Use of these dampers allows outside air to be blended with return air. Synchronized operation of the dampers is accomplished by interconnecting rods. As one damper section opens, the other section is being closed. Always a total of 100% CFM is drawn from this section. Damper positioning may be either manually or automati- cally adjusted. With a field installed controller, automatic operation can be obtained.
Face and Bypass Dampers Face and bypass dampers are available in a flat arrangement for use with heating coils and standard face area cooling coils, as well as a staggered arrangement for large face area cooling coils. The damper sets are linked through a jack shaft for connection to a single actuator (factory or field installed). Figure 41. Face and Bypass Dampers - RDS 800-802 only Airflow Face Dampers Open Face and Bypass Damper .75" (19mm) 90∞ Stroke 3.00" (76mm) Face Dampers Closed Figure 42.
Figure 43. Face and Bypass Dampers - Flat Arrangement - RAH 47-77 only Optional Contractor Coil Face and Bypass Damper Extended Shaft Face and Bypass Dampers Cabinet Weatherproofing This unit ships from the factory with fully gasketed access doors and cabinet caulking to provide weatherproof operation. After the unit has been set in place, inspect all door gaskets for shipping damage and replace if necessary.
Electrical Installation Field Power Wiring Without Optional Electrical Power Package All of the unit side panels are hinged. Disconnect switches and/or motor starters must not be mounted on panels which provide access to internal components. Wiring conduits can penetrate the cabinet bottom, base frame or through the hinge and latch cap without interfering with the access panels. Note: All holes cut into the unit must be sealed to prevent water leakage.
Table 11: Recommended 3-phase power wiring* FOR MCA Up to (Amps) Wire Gauge Qty./ Pole Insulation rating (°C) No. of Conduits Conduit/ (Trade, Size, In.
The preferred entrance for power cables is through the bottom knockouts provided on the unit. If side entrance is the only option, a drilling location is provided. The drilling dimensions must be followed exactly to prevent damage to the control panel. The dimensions provided are the only possible point of side entrance for the power cables. Field Control Wiring CAUTION Wiring must comply with applicable codes and ordinances and these specifications.
Preparing Unit for Operation Figure 49. Supply Fan Assembly WARNING Moving machinery hazard. Can cause severe injury or death. H o ld - d o w n F a s te n e rs Lock out and tag out all power and lock off before servicing equipment. More than one disconnect may be required to de-energize unit. Relief Damper Tie-Down (RDS 800-802 units only) Economizer sections with a 30" or 40" return fan have a relief damper that is tied down for shipping.
Adjustment of Supply Fan Thrust Restraints Thrust restraints are provided when housed double-width fans are mounted on springs. After the spring mounts have been adjusted for level operation when the fan is running, check the thrust restraints. With the fan off, set the adjustment nuts so the spring is slightly compressed against the angle bolted to the fan housing frame. When the fan is turned on, the fan will move back to a level position and the thrust restraint springs will compress.
angle and the snubber neoprene bumper. However, in a "seismic event," the snubber will limit movement of the spring mounted fan assembly to .25" (6 mm) in any direction, thereby helping to prevent the fan from being tossed about and damaged, or causing damage. The seismic restraint is adjustable in all directions. Vertical slots in the restrainer angle and horizontal slots in the blower base allow the restrainer angle to be adjusted up and down and back and forth.
Sequences of Operation The following sequences of operation are for a typical "C" vintage applied rooftop unit that is equipped with MicroTech II, an economizer, 4 compressor / 8 stage cooling, 3 to 1 turn down burner, variable frequency drives (VFD), a return air fan and an external time clock. These sequences describe the ladder wiring diagram logic in detail; refer to “Wiring Diagrams” on page 48 as you read them. Note that your unit's sequences of operation may vary from those described here.
drives the outdoor air dampers towards the open position, and MCB-BO5 towards the closed (line 338). If the outdoor air dampers are wide open and more cooling is required, the dampers will hold their positions and mechanical cooling will be activated (see below).
Wiring Diagrams Legend Designation Description Std. Location ACT1 .....................................................................Actuator Motor, Supply Fan Vanes......................................................................................... Supply Air Sect. ACT2 .....................................................................Actuator Motor, Return Fan Vanes ......................................................................................... Return Air Sect. ACT3, 4 ................
Legend DesignatIon Description Std. Location PB1 ...................................................................Powerblock. Total Unit or Cond/Heat .........................................................................................Main Control Box PB2 ................................................................... Powerblock, SAF/RAF/Controls .................................................................................................Main Control Box PB3 ...................................
Typical Control Circuit with Power Pack Only Typical Power Circuits Page 50 IM-487
Typical Compressor Staging Outputs For Remote Condensing Unit with MicroTech II Controls (All Terminals located on TB5) IM-487 Page 51
Typical Main Control Circuit (VAV Units) Page 52 IM-487
IM-487 Page 53
Typical Main Control Schematic (CAV Units) Page 54 IM-487
IM-487 Page 55
Typical Actuator Circuit Page 56 IM-487
Typical Supply/Return Fan Control Circuit IM-487 Page 57
Typical Gas Furnace Control Circuit (Modulating Burner, Mixed Air Intake) Page 58 IM-487
Typical Electric Heat Control Circuit (Multi-Stage) IM-487 Page 59
Unit Options Enthalpy Control Outside Air Enthalpy Control (OAE) Units with MicroTech II control and an economizer come standard with an electromechanical enthalpy control device (OAE) which senses both the humidity and temperature of the outside air entering the unit. This device has an enthalpy scale marked A through D. Table 12 shows the control points at 50% RH for settings A through D. Figure 55 shows this scale on a psychrometric chart.
Freeze Protection Duct High Pressure Limit An optional freezestat is available on units with MicroTech II control that have hot water or steam heating coils. The sensing element is located on the downstream side of the heating coil in the heating section of the unit. If the freezestat detects a freezing condition and closes, the MicroTech II controller will take different action, depending on whether the fans are on or off.
Note: NOTICE Inlet vanes must not be adjusted to close tight during fan operation. A minimum operating position of 5 degrees open is recommended to avoid pulsation. Units with factory installed MicroTech II controls will automatically open vanes 5 degrees prior to start-up. Actuator Rotation Adjustment The counterclockwise (as viewed from shaft end of actuator) limit switch is adjustable on the Barber-Colman actuator. The clockwise limit is not adjustable.
Figure 56. DWDI Housed Supply Fan Vane Assembly View #3 Open X = 3.00" - 20" Wheel (800C) 2.80" - 24" Wheel (802C) 180∞ CW to Open X Both Sides Closed Floating Link 24∞ View #1 Open View #2 Adjustable 1-1/8" (28mm) Slot Open 27"-33" Wheel/5-40HP 36" Wheel/5-40HP 40" Wheel/15-40HP 36" Wheel/50HP 40" Wheel/50-60HP 180∞ CW to Open 180∞ CW to Open 2.80" (71mm) 2.
Figure 57. Supply Fan Assembly (40" Wheels) A B 2 .5 5 C lo s e d 1 8 0 ° C W O p e n 1 8 ° A O p e n Figure 58. Supply Fan Assembly (44" Wheels) B A C lo s e d 2 4 ° 2 .
Figure 59. Supply Fan Assembly (49" Wheels) B A C lo s e d C lo s e d 2 4 ° A A 1 .9 0 1 .9 0 1 8 0 ° C W to O p e n 1 8 0 ° C W to O p e n O p e n O p e n 1 0 to 4 0 H P 5 0 to 7 5 H P Figure 60. Return Fan Vane Assembly (40" Wheels) A A A 1 8 0 ° C W T o O p e n C lo s e d B V IE W A -A O p e n 2 .
Figure 61. Return Fan Vane Assembly (44" Wheels) A A B B 1 8 0 ° C W T o O p e n 1 8 ° 2 .6 5 " Figure 62. Return Fan Vane Assembly - RDS 800-802 Return Fans (30" and 40" Wheels) C lo s e d O p e n V ie w # 1 3 0 " W h e e l (0 1 8 C - 0 4 0 C ) 2 .8 0 " B 1 8 0 ° C C W T o O p e n C lo s e d 6 0 ° A C lo s e d O p e n 1 8 0 ° C C W T o O p e n 2 0 ° O p e n V ie w # 2 4 0 " W h e e l (0 3 6 C , 0 4 0 C ) 2 .
Variable Frequency Drive Operation Refer to the vendor instructions supplied with the unit. Convenience Receptacle/Section Lights A convenience receptacle is provided in the main control box on all units. To utilize this receptacle, a separate field supplied 115V power wiring circuit must be connected to the 115V field terminal block TB1, located in the main control box. Note that the National Electrical Code requires that this circuit be protected by a ground fault circuit interrupter (GFCI) device.
Figure 65. Tape Fulcrum Alignment Plate to Vane Figure 66.
Propeller Exhaust Fan Option Figure 67. Leveling Adjustment T h r e a d e d A d ju s te r A s s e m b ly J a m L o n g A d ju s te r N u t N u ts T o In c re a s e L e v e l P o s itio n R e a d in g R IG H T H A N D Economizer units may include propeller exhaust or centrifugal return fan options. This section covers maintenance and operating instructions for the propeller exhaust option.
Figure 69. Fan Rotation Figure 70. Belt Adjustment D e fle c tio n = A ir flo w B e lt S p a n A ir flo w R o ta tio n B e lt S p a n 6 4 R o ta tio n Once the fan has been put into operation, set up a periodic maintenance program to preserve the reliability and performance of the fan. Items to be included in this program are: • • • • • • Belts Bearings Fasteners Setscrews Lubrication Removal of Dust/Dirt Figure 71.
Bearings Bearings are the most critical moving part of the fan and should be inspected at periodic intervals. Locking collars and set screws, in addition to fasteners attaching the bearings to the bearing plate, must be checked for tightness. In a clean environment and temperatures above 32°F/below 200°F, lubricate fan shaft bearings with grease fittings semi-annually using a high quality lithium based grease.
Propeller Exhaust Fan Control Exhaust Fan On/Off Control The Exhaust fans are turned on and off based on building static pressure, outdoor air damper position, and discharge fan capacity. Exhaust fans do not have to always run while the supply fan is on, as the does a return fan. They are turned on and off through DO # 2 on the Mod DCU as described below. The Exhaust Fans are turned on when: • All of the following are true for longer than the Min Start Time (Default Time = 120 Seconds).
DANGER Electric shock and moving machinery hazard. Can cause severe equipment damage, personal injury, or death. Lock out and tag out electrical power before servicing this equipment. All start-up and service work must be performed trained, experienced technicians. Read and follow this manual: "MicroTech II Applied Rooftop Unit Controller" manual (Bulletin IM 696), and operation manual (Bulletin OM 137 or OM 138) before operating or servicing.
Note: The supply and return fan drives are usually selected for operation in the drive's midspeed range. The return fan drives are usually shipped with fixed pitch sheaves that will provide the selected fan speed; however, the supply fan drives are usually shipped with variable pitch sheaves that are adjusted to provide the minimum fan speed. Adjust both drives for proper airflow during air balancing. For more information, refer to “Air Balancing” on page 75.
ture \ Zone Cooling \ Occ Clg Spt = will need to be adjusted below the temperature shown in Temperature \ Zone Cooling \ Control Temp =. In addition, on DAC units, the value in Temperature \ Discharge Cooling \ DAT Clg Spt = will need to be adjusted below the temperature shown in Temperature \ Discharge Cooling \ Disch Air =. 3. The chilled water value (VMS) will modulate to maintain set point as follows: See also “Typical Actuator Circuit” on page 56.
Figure 73. Sheave Alignment (adjustable shown) 4. Keep belts free from foreign material which may cause slippage. M u s t b e p a r a lle l 5. Make V-drive inspection on a periodic basis. Adjust tension if the belt is slipping. Do not apply belt dressing. This may damage the belt and cause early failure. Tension Measurement Procedure 1. Measure the belt span. See Figure 74. B e a r in g 2. Place belt tension checker squarely on one belt at the center of the belt span.
Mounting and Adjusting Motor Sheaves Figure 75. VM and VP variable pitch sheaves A 3. Adjust the sheave pitch diameter for the desired fan speed by opening the moving parts by half or full turns from closed position. Do not open more than five full turns for "A" belts or six full turns for "B" belts. Adjust both halves of two-groove sheaves by the same number of turns from closed to verify that both grooves have the same pitch diameter.
Adjusting: 1. Slack off belt tension by moving the motor toward the driven shaft until the belts are free from the grooves. For easiest adjustment, remove the belts. 1. Slack off all belt tension by moving the motor toward the driven shaft until the belts are free from the grooves. For easiest adjustment, remove the belts. 2. Loosen both locking screws "A" in outer locking ring, but do not remove them from the sheave. There is a gap of approximately .2" (1 mm) between the inner and outer locking rings.
Figure 77. MVP variable pitch sheaves (type A-B) C e n te r F la n g e s G a p O u te r L o c k in g R in g L o c k in g S c re w s "A " In n e r L o c k in g R in g S p a n n e r W re n c h H o le 3 C a p s c re w s "B " Figure 78.
Final Control Settings When all start-up procedures have been completed, set the controls and program the MicroTech II controller for normal operation. Use the following list as a guide; some items may not apply to your unit. For more detail, refer to OM696. 14.Set the economizer control parameters as required in keypad menu Temperature \ OA Damper \. 1. Turn system switch S1 & S7 to "on." 2. Turn gas furnace switch S3 to "auto" or turn electric heat switch HS1 to "on." 16.
IM-487 CANCEL BACK Sub Menus 2 3 4 5 6 7 Airflow Temperatures Schedules Setup/Service Active Alarms Previous Alarms Occupancy= _____ Occ Mode= Auto Occ Src= _____ Bypass Time= 0min Emerg Override= Norm UnitStatus= _____ Clg Capacity= xxx% Htg Capacity= xxx% Clg Status= _____ Htg Status= _____ Disch Air= xxx.x°F Clg Capacity= xxx% Eff Clg Spt= xxx.x°F DAT Clg Spt= 55.0°F Clg Db= 1.0°F Min Clg Spt= 55.0°F Max Clg Spt= 65.0°F Clg Reset= None Min Clg Spt@= 90 Max Clg Spt@= 70 Control Temp= xxx.
A Page 82 DF Min w/Exh= 20% Start Init= 180sec Post Heat= 0min Min Exh On= 120sec Min Exh Off= 120sec Comp 4= xxxxx hr Heating= xxxxx hr Economizer= xxxxx hr Bypass= xxxxx hr Clg Period= 30sec Stage Time= 5min Lead Circuit= #1 Comp Ctrl= Cross Circ Clg Method= Average Cond Fan1 Spt= 0°F BSP Propbd= 1.0"WC BSP IntTime= 10sec BSP Period= 5sec Stage Time= 5min Cond Fan Diff= 10°F Cond Fan4 Spt= 0°F Parameters Common to Both Control Methods Period= 60sec Clg IntTime = 700sec Htg Propbd = 12.
B IM-487 Return Sensor= Slow Ent Fan Sens= Slow Lo Airflow= Slow Heat Fail= Slow Space Sensor= Fast Return Sensor= Fast Disch Sensor= Fast Duct Hi Limit= Fast Fan Operation= Off Alarm= Normal OA Damper= Auto Mod Cooling= Auto Disch VFD= Auto Sensor Loc = Return Active Alarm 2 Alarm Name Alarm Type dd-mmm-yyy hh:mm:ss Previous Alarm 5 Alarm Name Alarm Type dd-mmm-yyy hh:mm:ss Active Alarm 1 Alarm Name Alarm Type dd-mmm-yyy hh:mm:ss Previous Alarm 4 Alarm Name Alarm Type dd-mmm-yyy hh:mm:ss 6
Maintenance 11. Check and adjust all temperature and pressure controls as needed. Installation and maintenance must be performed only by trained personnel who are experienced with this type of equipment and familiar with local codes and regulations. 12.Check and adjust all damper linkages as needed. 13.Check the operation of all safety controls. 14.Examine the gas furnace (see Bulletin No. IM 684 or685). 15.Lubricate the door latch mechanisms. DANGER Moving machinery and electrical power hazards.
2. It may be necessary to put a heat source (light bulb) in the main control panel to prevent the accumulation of atmospheric condensate within the panel. Table 16: Recommended greases MANUFACTURER PRODUCT NAME TEMP. RANGE (°F) -30 to 300 3. The location and wattage of the heat source will be dependent on local environmental conditions. Texaco Lubricants Co. Premium RB Keystone Ind. Lubricants 84EP-2 -40 to 200 Mobil Oil Corporation Mobilith AW2 -40 to 325 4.
Setscrews Setscrews lock bearings, sheaves, locking collars, and fan wheels to their shafts. It is very important that all setscrews be checked periodically to provide that they have not loosened. If this is not done, severe equipment damage could occur. Using Table 19, check the tightness of all setscrews with a torque wrench. Note that if the return fan bearings setscrews must be retightened, a special procedure is required to equally load both bearings (see “Return Fan Bearing Setscrews” ).
Table 20: Airfoil Wheel-to-Funnel Tolerances Wheel-to-Funnel Relationship (In Inches) Wheel Diameter Inches) “A” +0.3/ —0.0 27 .31" (8mm) 30 .31" (8mm) 33 .31" (8mm) 36 .44 (11mm) 40 .62" (16mm) Figure 86. 44" & 49" Airfoil Wheel-to-Funnel Alignment Table 21: 44" & 49 Airfoil Wheel-to-Funnel Tolerances WHEEL-TO-FUNNEL RELATIONSHIP WHEEL DIA. (IN.) “A” (IN INCHES) 40 16.21 (412 mm) 49 17.
Replacement Parts List Table 22: Microtech II Components Parts List Component Designation Description McQuay Part Number MCB Main Control Board 060006101 CCB1 Auxiliary Cooling Control Board (DX Circuit #1 or Generic Condenser) 106102701 CCB2 Auxiliary Cooling Control Board (DX Circuit #2) 106102701 EHB1 Auxiliary Electric Heat Control Board 106102801 ERB1 Auxiliary Energy Recovery Control Board 106102701 - Keypad/Display 060006301 - Keypad-Main Control Board Cable 111044601 Zone Tem
