INSTALLATION INSTRUCTIONS FOR *CVC9/95 & *MVC95 - TWO-STAGE GAS FURNACE (Type FSP CATEGORY IV Direct or Non Direct Vent Air Furnace) Installer: Affix all manuals adjacent to the unit. These furnaces comply with requirements embodied in the American National Standard / National Standard of Canada ANSI Z21.47·CSA-2.3 Gas Fired Central Furnaces. ® C US RECOGNIZE THIS SYMBOL AS A SAFETY PRECAUTION.
SHIPPING INSPECTION ........................................................................................................................... 6 ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS ..................................................................................... 6 TO THE INSTALLER .............................................................................................................................. 6 IMPORTANT NOTE TO THE OWNER REGARDING PRODUCT WARRANTY ...................................
115 VOLT LINE CONNECTION OF ACCESSORIES (HUMIDIFIER AND ELECTRONIC AIR CLEANER) ............................. 29 24 VOLT HUMIDIFIER ......................................................................................................................... 30 GAS SUPPLY AND PIPING ......................................................................................................................... 30 HIGH ALTITUDE DERATE .......................................................................................
FLAME SENSOR ................................................................................................................................ TROUBLESHOOTING ................................................................................................................................. ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS ................................................................................... DIAGNOSTIC CHART .................................................................................
SAFETY PRECAUTIONS Adhere to the following warnings and cautions when installing, adjusting, altering, servicing, or operating the furnace. To ensure proper installation and operation, thoroughly read this manual for specifics pertaining to the installation and application of this product. WARNING WARNING TO PREVENT POSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH DUE TO ELECTRICAL SHOCK , THE FURNACE MUST BE LOCATED TO PROTECT THE ELECTRICAL COMPONENTS FROM WATER.
PRODUCT DESCRIPTION & APPLICATION SHIPPINGINSPECTION 4. Discharge your body to ground before removing a new control from its container. Follow steps 1 through 3 if installing the control on a furnace. Return any old or new controls to their containers before touching any ungrounded object. All units are securely packed in shipping containers tested according to International Safe Transit Association specifications. The carton must be checked upon arrival for external damage.
PRODUCT DESCRIPTION & APPLICATION Dual certification means that the combustion air inlet pipe is optional and the furnace can be vented as a: Non-direct vent (single pipe) central forced air furnace in which combustion air is taken from the installation area or from air ducted from the outside or, Direct vent (dual pipe) central forced air furnace in which all combustion air supplied directly to the furnace burners through a special air intake system outlined in these instructions.
LOCATION REQUIREMENTS & CONSIDERATIONS A copy of the National Fuel Gas Code (NFPA 54/ANSI Z223.1) can be obtained from any of the following: American National Standards Institute 1430 Broadway New York, NY 10018 • National Fire Protection Association 1 Batterymarch Park Quincy, MA 02269 • CSA International 8501 East Pleasant Valley Cleveland, OH 44131 • The rated heating capacity of the furnace should be greater than or equal to the total heat loss of the area to be heated.
LOCATION REQUIREMENTS & CONSIDERATIONS • • • • • • • If the furnace is used in connection with a cooling coil unit, install the furnace upstream or in parallel with the cooling coil unit. Premature heat exchanger failure will result if the cooling unit is placed ahead of the furnace. If the furnace is installed in a residential garage, position the furnace so that the burners and ignition source are located not less than 18 inches (457 mm) above the floor.
COMBUSTION & VENTILATION AIR REQUIREMENTS • 2. Inspect the venting system for proper size and horizontal pitch, as required by the National Fuel Gas Code, ANSI Z223.1 or the Natural Gas and Propane Installation Code, CSA B149.1-05 and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition. Unconditioned areas behind the thermostat, such as an outside wall.
HORIZONTAL APPLICATIONS & CONSIDERATIONS HORIZONTAL APPLICATIONS & CONSIDERATIONS When using the horizontal alternate vent configuration, you must use the RF000142 vent drain kit. See following illustration. Horizontal applications, in particular, may dictate many of the installation’s specifics such as airflow direction, ductwork connections, flue and combustion air pipe connections, etc. The basic application of this furnace as a horizontal furnace differs only slightly from an upright installation.
PROPANE GAS/HIGH ALTITUDE INSTALLATIONS ALTERNATE ELECTRICAL AND GAS LINE CONNECTIONS Contact the distributor for a tabular listing of appropriate manufacturer’s kits for propane gas and/or high altitude installations. The indicated kits must be used to insure safe and proper furnace operation. All conversions must be performed by a qualified installer, or service agency. This furnace has provisions allowing for electrical and gas line connections through either side panel.
VENT/FLUE PIPE & COMBUSTION AIR PIPE Piping must be adequately secured and supported to prohibit sagging, joint separation, and/or detachment from the furnace. Horizontal runs of vent/flue piping must be supported every three to five feet and must maintain a 1/4 inch per foot downward slope, back towards the furnace, to properly return condensate to the furnace’s drain system. Allowances should be made for minor expansion and contraction due to temperature variations.
VENT/FLUE PIPE & COMBUSTION AIR PIPE vicing. Combustion Air and Vent piping should be routed in a manner to avoid contact with refrigerant lines, metering devices, condensate drain lines, etc. If necessary, clearances may be increased by utilizing two 45 deg. Long-Sweep Elbows and creating an “S” joint to provide additional space at connection locations. This joint can be rotated on the fitting to establish maximum clearance between refrigerant lines, metering devices, and condensate drain lines, etc.
VENT/FLUE PIPE & COMBUSTION AIR PIPE COMBUSTION AIR PIPE (DIRECT VENT ONLY) 90 PVC ELBOW (NON-DIRECT VENT) COMBUSTION AIR PIPE (DIRECT VENT ONLY) VENT/FLUE PIPE RUBBER COUPLING WITH WORM GEAR CLAMPS 90 PVC ELBOW (NON-DIRECT VENT) 4. Cut the vent/flue pipe 3.75 inches from the flanged end of the pipe (see “Vent/Flue Pipe Cuts” figure). The section of pipe attached to the coupling will reach through the side panel to the induced draft blower. Discard remaining pipe and elbows. Counterflow units.
VENT/FLUE PIPE & COMBUSTION AIR PIPE 8. Upflow and Counterflow units. For horizontal installations, externally secure the fieldsupplied vent/flue pipe directly to the vent/flue coupling using a PVC or ABS coupling or elbow. 3. Remove plastic plug from alternate combustion air intake location. Relocate and install plug in standard air intake location (basepan). Plug the remaining hole in the blower deck with the plastic plug included in the drain kit bag. 4.
VENT/FLUE PIPE & COMBUSTION AIR PIPE NON-DIRECT VENT (SINGLE PIPE) PIPING 1) One 90° elbow should be secured to the combustion air intake connection. 2) Minimum requirement for each vent pipe is five (5) feet in length and one elbow/tee. Non-direct vent installations require only a vent/flue pipe. The vent pipe can be run horizontally with an exit through the side of the building or run vertically with an exit through the roof of the building.
VENT/FLUE PIPE & COMBUSTION AIR PIPE DIRECT VENT (DUAL PIPE) PIPING In a basement installation, the vent/flue pipe can be run between joist spaces. If the vent pipe must go below a joist and then up into the last joist space to penetrate the header, two 45° elbows should be used to reach the header rather than two 90° elbows.
VENT/FLUE PIPE & COMBUSTION AIR PIPE TEE (OPTIONAL) UPFLOW Direct Vent (Dual Pipe) Maximum Allowable Length* of Vent/Flue & Combustion Air Intake Pipe (ft) Unit Input Termination (Btu) Style 45,000 VENT/FLUE COMBUSTION AIR INTAKE Number of Elbows (1)(2)(3)(5) (4) Pipe (inch) 1 2 3 4 5 6 7 8 Standard 2 or 2 1/2 71 68 65 62 59 56 53 50 Alternate 2 or 2 1/2 58 55 52 49 46 43 40 37 2 or 2 1/2 49 46 43 40 37 34 31 28 3 2 or 2 1/2 71 36 68 33 65 30 62 27 59 24 56 2
VENT/FLUE PIPE & COMBUSTION AIR PIPE VENT/INTAKE TERMINATIONS FOR INSTALLATION OF MULTIPLE DIRECT VENT FURNACES 90º MEDIUM RADIUS ELBOW If more than one direct vent furnace is to be installed vertically through a common roof top, maintain the same minimum clearances between the exhaust vent and air intake terminations of adjacent units as with the exhaust vent and air intake terminations of a single unit.
CONDENSATE DRAIN LINES & DRAIN TRAP CONDENSATE DRAIN LINES & DRAIN TRAP HOSE A QTY: 1 A condensing gas furnace achieves its high level of efficiency by extracting almost all of the heat from the products of combustion and cooling them to the point where condensation takes place. The condensate which is generated must be piped to an appropriate drain location.
CONDENSATE DRAIN LINES & DRAIN TRAP 5. Cut 17 3/4 inches from the long end of Hose B and discard. Secure the remaining hose to Tube 1 with a green hose clamp. Route the other end of Hose B to front right side panel grommet hole. UPRIGHT INSTALLATIONS-TRAP ON RIGHT SIDE In a upright installation drain hoses are connected to drain ports on the rubber elbow and the recuperator coil front cover.
CONDENSATE DRAIN LINES & DRAIN TRAP ALTERNATE VENT/FLUE DRAIN HOSE CONNECTIONS 7. Secure straight end of Hose B to exposed end of Tube 1 with a green hose clamp. Route hose toward right side panel grommet holes. 8. Insert short end of one Tube 2 through rear right side panel grommet drain hole. Secure tube to Hose A with a green hose clamp. 9. Insert short end of remaining Tube 2 into Hose B from rubber elbow and secure with green hose clamp.
CONDENSATE DRAIN LINES & DRAIN TRAP 5. Cut “X” inches from the long end of Hose B and discard. Refer to table for appropriate length to cut. Secure remaining hose to Tube 1 with a green hose clamp. Route other end of Hose B to front left side panel grommet hole. UPRIGHT INSTALLATIONS-TRAP ON LEFT SIDE NOTE: For left side trap installation, grommets must be moved to the left side of the furnace and the plugs installed on the right side of the furnace. 1.
CONDENSATE DRAIN LINES & DRAIN TRAP UPRIGHT DRAIN TRAP MOUNTING (LEFT OR RIGHT SIDE PANEL) 1. Insert drain tubes into drain trap and position the drain trap against the side panel. NOTE: Drain tubes must reach the bottom of the drain trap. 2. Secure drain trap to side panel at the mounting holes (dimples or crosshairs on counterflow models) located below the grommet drain holes. 3. Attach PVC drain line to drain trap outlet with either a 90° elbow or coupling. 2. 3. 4. HORIZONTAL INSTALLATIONS 5. 6.
CONDENSATE DRAIN LINES & DRAIN TRAP LEFT SIDE DOWN 6. Cut 5 1/2 inches straight length from the long end of each Tube 2 and discard radius ends. 7. Insert approximately one inch of each Tube 2 through left side panel grommet hole. Secure tubes to Hose A and Hose B with a green hose clamps. NOTE: Tube must reach bottom of trap. Ensure hoses and tubes maintain a downward slope for proper drainage and that they are not kinked or binding.
ELECTRICAL CONNECTIONS ELECTRICAL CONNECTIONS left side panel. The furnace is shipped configured for a right side (left side for counterflows) electrical connection with the junction box located inside the burner compartment. To make electrical connections through the opposite side of the furnace, the junction box must be relocated to the other side of the burner compartment prior to making electrical connections. To relocate the junction box, follow the steps shown below.
ELECTRICAL CONNECTIONS 1. Measure resistance between the neutral (white) connection and one of the burners. 2. Resistance should measure 10 ohms or less. Thermostat Single Stage Heating with Single Stage Cooling R This furnace is equipped with a blower door interlock switch which interrupts unit voltage when the blower door is opened for servicing. Do not defeat this switch.
ELECTRICAL CONNECTIONS temperature sensor to determine the most cost efficient means of heating (heat pump or gas furnace). To use a single-stage thermostat, turn off power to the furnace, move the thermostat selection DIP switch to the OFF position. Set the desired transition time by setting the transition delay DIP switch to the desired ON/OFF position. Turn power back on. Refer to the following figure.
GAS SUPPLY AND PIPING Inlet gas supply pressures must be maintained within the ranges specified in the following table. The supply pressure must be constant and available with all other household gas fired appliances operating. The minimum gas supply pressure must be maintained to prevent unreliable ignition. The maximum must not be exceeded to prevent unit overfiring. Natural Gas Propane Gas Inlet Gas Supply Pressure Minimum: 5.0" w.c. Maximum:10.0" w.c. Minimum: 11.0" w.c. Maximum:13.0" w.c.
GAS SUPPLY Contact your distributor for a tabular listing of appropriate manufacturer’s kits for propane gas and/or high altitude installations. The indicated kits must be used to insure safe and proper furnace operation. All conversions must be performed by a qualified installer, or service agency. AND PIPING installer may also need to supply a transition piece from 1/2" pipe to a larger pipe size. The following stipulations apply when connecting gas piping.
GAS SUPPLY AND PIPING GAS VALVE MANIFOLD MANUAL SHUT OFF VALVE (UPSTREAM FROM BURNERS GAS LINE PIPE UNION) PLUG IN GAS LINE HOLE PLUG IN ALTERNATE GAS LINE HOLE HEIGHT REQUIRED BY LOCAL CODE GROMMET IN STANDARD GAS LINE HOLE GAS VALVE PIPE UNION DRIP LEG BURNERS DRIP LEG MANUAL SHUT-OFF VALVE (UPSTREAM FROM GROUND JOINT PIPE UNION) GROUND JOINT PIPE UNION DRIP LEG GAS VALVE GAS VALVE GROMMET IN STANDARD GAS LINE HOLE BURNERS BURNERS DRAIN TRAP DRAIN TRAP MANIFOLD MANIFOLD ALTERNATE GAS LI
GAS SUPPLY AND PIPING PROPANE GAS TANKS AND PIPING DIRECT/STANDARD INLET PIPING WARNING WARNING IF THE GAS FURNACE IS INSTALLED IN A BASEMENT, AN EXCAVATED AREA OR CONFINED SPACE , IT IS STRONGLY RECOMMENDED TO EDGES OF SHEET METAL HOLES MAY BE SHARP. USE GLOVES AS A PRECAUTION WHEN REMOVING HOLE PLUGS. CONTACT A PROPANE SUPPLIER TO INSTALL A GAS DETECTING WARNING DEVICE IN CASE OF A GAS LEAK.
GAS SUPPLY AND PIPING ing, Warm Air Heating and Ventilating Systems. Pamphlets No. 90A and 90B. Sizing Between First and Second Stage Regulator* Maximum Propane Capacities listed are based on 2 psig pressure drop at 10 psig setting. Capacities in 1,000 BTU/hour.
CIRCULATING AIR & FILTERS 4. Consult proper tables for the quantity of air. CUT USING TIN SNIPS If the total external static pressure exceeds the maximum listed on the furnace rating plate, check for closed dampers, registers, undersized and/or oversized poorly laid out duct work.
STARTUP PROCEDURE & ADJUSTMENT The following figure shows possible filter locations.
STARTUP PROCEDURE & ADJUSTMENT HEAT ANTICIPATOR SETTING GAS SUPPLY PRESSURE MEASUREMENT The heat anticipator in the room thermostat must be correctly adjusted to obtain the proper number of cycles per hour and to prevent “overshooting” of the setting. Set the heat anticipator setting to 0.7 amps. Follow the thermostat manufacturer’s instructions on how to adjust the heat anticipator setting.
STARTUP PROCEDURE & ADJUSTMENT Honeywell Model VR9205 (Two-Stage) Manometer Hose Open to Atmosphere Gas Line Common Terminal(C) High Fire Coil Terminal (HI) Gas Shutoff Valve Low Fire Coil Terminal (LO) Gas Line To Furnace i Open To Atmosphere Inlet Pressure Tap 1/8 NPT Drip Leg Cap With Fitting Manometer Manometer Hose Manometer Outlet Pressure Tap 1/8 NPT Measuring Inlet Gas Pressure (Alt.
STARTUP PROCEDURE & ADJUSTMENT Installation’s gas heating (HTG) value: 1,000 BTU/ft3 (Obtained from gas supplier) Installation’s seconds per cubic foot: 34 sec/ ft3 Conversion Factor (hours to seconds): 3600 sec/hr Input = (Htg. value x 3600) ÷ seconds per cubic foot Input = (1,000 BTU/ft3 x 3600 sec/hr) ÷ 34 sec/ ft3 Input = 106,000 BTU/hr 9. Close thermostat “R” and “W2” contacts to provide a call for high stage heat. 10.
STARTUP PROCEDURE & ADJUSTMENT The cooling system manufacturer’s instructions must be checked for required air flow. Any electronic air cleaners or other devices may require specific air flows, consult installation instructions of those devices for requirements. 3. Knowing the furnace model, locate the high stage cooling air flow charts in the Specification Sheet applicable to your model. Look up the cooling air flow determined in step 2 and find the required cooling speed and adjustment setting.
STARTUP PROCEDURE & ADJUSTMENT • Profile B ramps up to full cooling demand airflow by first stepping up to 50% of the full demand for 30 seconds. The motor then ramps to 100% of the required airflow. A one (1) minute OFF delay at 100% of the cooling airflow is provided. Model *MVC950453BX* 100% CFM 100% CFM 50% CFM OFF OFF 1/2 min 1 min *MVC950704CX* • Profile C ramps up to 85% of the full cooling demand airflow and operates there for approximately 7 1/2 minutes.
COMFORTNET™ SYSTEM COMFORTNET™ SYSTEM 7. Select the heating speed for your model from the heating speed chart in the Specification Sheet. The adjust setting (already established by the cooling speed selection) determines which set of speeds are available. The selected speed must provide a temperature rise within the rise range listed with the particular model. Example: The *MVC950704CX is set for 990 CFM on cooling, the “ADJUST” is set to “+” (plus).
COMFORTNET™ SYSTEM demand and transmits the demand along with a fan request to the indoor unit. The indoor unit then sends the demand to the ECM motor. The table below lists the various ComfortNet™ systems, the operating mode, and airflow demand source.
COMFORTNET™ SYSTEM 40VA Transformer (included in CTK01AA kit) • CTK01AA Thermostat 1 2 R C 1 2 CT™ Compatible R C Furnace Integrated Control Module 1 2 R C Touch and hold the Installer Config key again for approximately 3 seconds to enter the Advanced Installer Configuration menu.
COMFORTNET™ SYSTEM FURNACE ADVANCED FEATURES MENUS CONFIGURATION Submenu Item Number of Heat Stages (HT STG) Indication (for Display Only; not User Modifiable) Displays the number of furnace heating stages Input Rate (BTU/HR) Motor HP (1/2, ¾, or 1 MTR HP) Displays the furnace input rate in kBtu/hr Displays the furnace indoor blower motor horsepower DIAGNOSTICS Submenu Item Fault 1 (FAULT #1) Indication/User Modifiable Options Most recent furnace fault Comments For display only Fault 2 (FAULT #2) Fa
COMFORTNET™ SYSTEM NON-COMM (APPLIES ONLY TO A CT COMPATIBLE FURNACE MATCHED WITH A NON-CT COMPATIBLE SINGLE STAGE AIR CONDITIONER) Submenu Item User Modifiable Options Comments Cool Airflow (CL CFM) 18, 24, 30, 36, 42, 48, or 60, default is 18 Selects the airflow for the non-CT compatible single stage AC unit Cool Airflow Trim (CL TRM) -10% to +10% in 2% increments, default is 0% A, B, C, or D, default is A Cool ON Delay (CL ON) 5, 10, 20, or 30 seconds, default is 5 seconds Selects the airflow t
NORMAL SEQUENCE LED LED Status Off 1 Flash Indication Possible Causes Notes & Cautions x None x Depress once quickly for a powerup reset x Depress and hold for 2 seconds for an out-of-box reset x None x None x Communications Failure x None x Depress Learn Button x Verify that bus BIAS and TERM dipswitches are in the ON position.
OPERATIONAL CHECKS & SAFETY CIRCUIT DESCRIPTION • Integrated control module performs safety circuit checks. • Induced draft blower is energized on high speed for a 15• the balance of the heat off delay period (60, 90, 120 or 150 seconds). • Circulator blower and electronic air cleaner terminal is de- second prepurge. Humidifier terminal is energized with induced draft blower. Induced draft blower steps to low speed following prepurge. Low stage pressure switch contacts are closed. energized.
TROUBLESHOOTING & MAINTENANCE OPERATIONAL CHECKS the coil front cover. These switches guard against insufficient airflow (combustion air and flue products) through the heat exchanger and/or blocked condensate drain conditions. The burner flames should be inspected with the burner compartment door installed. Flames should be stable, quiet, soft, and blue (dust may cause orange tips but they must not be yellow).
TROUBLESHOOTING & MAINTENANCE RESETTING FROM LOCKOUT FILTERS Furnace lockout results when a furnace is unable to achieve ignition after three attempts during a single call for heat. It is characterized by a non-functioning furnace and a E0 code displayed on the dual 7-segment display. If the furnace is in “lockout”, it will (or can be) reset in any of the following ways. 1. Automatic reset.
MISCELLANEOUS BEFORE LEAVING AN INSTALLATION CONDENSATE TRAP AND DRAIN SYSTEM (QUALIFIED SERVICER ONLY) • Cycle the furnace with the thermostat at least three times. Verify cooling and fan only operation. Annually inspect the drain tubes, drain trap, and field-supplied drain line for proper condensate drainage. Check drain system for hose connection tightness, blockage, and leaks. Clean or repair as necessary.
DIP SWITCHES Sw itch Bank Function Pur pos e Heat OFF Delay S1 Thermostat Setup S2 2 3 4 5 6 7 8 9 OFF OFF --- --- --- --- --- --- --- 10 --- 120 seconds ON OFF --- --- --- --- --- --- --- --- 150 seconds* OFF ON --- --- --- --- --- --- --- --- 180 seconds ON ON --- --- --- --- --- --- --- --- 1-Stage T-stat --- --- OFF --- --- --- --- --- --- --- 2-Stage T-Stat --- --- ON --- --- --- --- --- --- --- 5-Min Delay --- --- --- OF
x Furnace fails to operate. x Integrated control module LED display provides E1 error code. x ComfortNet™ thermostat “Call for Service” icon illuminated. x ComfortNet™ thermostat scrolls “Check Furnace” message. x Induced draft blower runs continuously with no further furnace operation. x Integrated control module LED display provides E2 error code. x ComfortNet™ thermostat “Call for Service” icon illuminated. x ComfortNet™ thermostat scrolls “Check Furnace” message.
x Furnace fails to operate. x Integrated control module LED display provides E7 error code. x ComfortNet™ thermostat “Call for Service” icon illuminated. x ComfortNet™ thermostat scrolls “Check Furnace” message. E7 x Problem with igniter circuit. x Flame sense micro amp signal is low E6 E7 WEAK FLAME IGNITER FAULT Not Displayed Not Displayed x Open Fuse E5 E6 E4 IMPROPER FLAME x Flame sensed with no call for heat.
E8 E9 EA d0 x Furnace fails to operate on high stage; furnace operates normally on low stage. x Integrated control module LED display provides E9 error code. x Furnace fails to operate. x Integrated control module LED display provides EA error code. x ComfortNet™ thermostat “Call for Service” icon illuminated. x ComfortNet™ thermostat scrolls “Check Furnace” message. x Furnace fails to operate. x Integrated control module LED display provides d0 error code.
b3 x Furnace operates at reduced performance. x Airflow delivered is less than expected. x Integrated control module LED display provides b3 error code. b1 x Furnace fails to operate. x Integrated control module LED display provides b1 error code. x ComfortNet™ thermostat “Call for Service” icon illuminated. x ComfortNet™ thermostat scrolls “Check Furnace” message. b2 b0 x Furnace fails to operate. x Integrated control module LED display provides b0 error code.
x Airflow is lower than demanded. b9 b9 b7 MOTOR PARAMS x Circulator blower motor does not have enough information to operate properly. x Motor fails to start 40 consecutive times. b7 LOW ID AIRFLOW b6 MOTOR VOLTS x Circulator blower motor shuts down for over or under voltage condition. x Circulator blower motor shuts down due to over temperature condition on power module. b6 x Furnace fails to operate. x Integrated control module LED display provides b7 error code.
STATUS CODES INTERNAL CONTROL FAULT/NO POWER O E E E E E E E E P 0 1 2 3 4 5 6 7 NORMAL OPERATION E E E d d b b b b 8 9 A 0 4 0 1 2 3 HIGH STAGE PRESSURE SWITCH STUCK CLOSED AT START OF HEATING CYCLE b b b b b C C 4 5 6 7 9 1 2 BLOWER MOTOR CURRENT TRIP OR LOST ROTOR LOCKOUT DUE TO EXCESSIVE RETRIES LOW STAGE PRESSUE SWITCH STUCK CLOSED AT START OF HEATING CYCLE LOW STAGE PRSSURE SWITCH STUCK OPEN OPEN HIGH LIMIT SWITCH FLAME DETECTED WHEN NO FLAME SHOULD BE PRESENT OPEN FUSE LOW FLAME SIGNAL IGN
*CVC9_AA, *MVC95_AA WIRING DIAGRAM HIGH VOLTAGE! Disconnect ALL power before servicing or installing this unit. Multiple power sources may be present. Failure to do so may cause property damage, personal injury or death. TO 115 VAC/ 1Ø /60 HZ POWER SUPPLY WITH OVERCURRENT PROTECTION DEVICE GND 24V HUM.
WIRING DIAGRAM *CVC9_AB, *MVC95_AB HIGH VOLTAGE! Disconnect ALL power before servicing or installing this unit. Multiple power sources may be present. Failure to do so may cause property damage, personal injury or death. TO 115 VAC/1 Ø /60HZ POWER SUPPLY WITH OVERCURRENT PROTECTION DEVICE GND 24V HUM.
