37AHA SERIES HYDRONIC AIR HANDLER SIZES 045 THRU 090 Installation, Operation, and Maintenance Manual Consumer Safety Information................................ 2 Overview of the Rinnai Hydronic Air Handler........ 3 Model Number Nomenclature ............................... 3 Physical Data......................................................... 4 Receiving & Checking Equipment ......................... 5 Installation Clearances .................................................... 5 Locating and Mounting .
Consumer Safety Information SAFETY DEFINITIONS Indicates safety alerts. When this symbol is seen on the Hydronic Air Handler and in all instructions and/or manuals, be alert to the potential for personal injury. Recognize signal words DANGER, WARNING, and CAUTION. These words are used with the safety alert symbol. DANGER Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
Overview of the Rinnai Hydronic Air Handler INTRODUCTION: The optimum in hydronic technology: the newly designed Rinnai® multi-position Hydronic Air Handlers offer a unique solution for a wide variety of small and medium sized residential and light commercial applications. They are compact and ready to fit in tight spaces which may include, but not limited to, attics, basements, closets, crawlspaces, and utility rooms.
Table 1 - Physical Data DIMENSIONS A UNIT SIZE B C D E in. mm in. mm in. mm in. mm in. mm 37AHA04508KA5 14 355.6 18 457.2 12 304.8 10 - 1/2 266.7 19 482.6 37AHA06012KA5 17 -1/2 444.5 18 457.2 16 406.4 16 - 11/16 423.9 19 - 1/4 489.0 37AHA07514KA5 21 533.4 18 457.2 20 508 18 - 11/16 474.7 19 - 1/2 495.3 37AHA09016KA5 24 - 1/2 622.3 18 457.2 24 609.6 21 - 1/8 536.6 19 482.6 C B 1" 7/8” Dia. KO Thermostat Wire Entry (Typ.
Receiving and Checking Equipment IDENTIFY UNIT The unit model number and serial number are stamped on the unit identification / name plate (located on the top right side of unit). Check this information against shipping papers and job requirements. INSPECT SHIPMENT Upon receipt of a 37 Series Hydronic Air Handler the packaging should be checked for peripheral signs of transportation damage while unit is still in the shipping package.
Installation LOCATING AND MOUNTING THE HYDRONIC AIR HANDLER General The multi-position 37AHA Series Hydronic Air Handlers are shipped in packaged configuration. This means that the units may be installed without assembly and/or modifications when configured for bottom return air inlet application; however, some modifications and assembly are necessary if units are to be installed in an application that requires side return air inlet arrangement.
Installation Blower located below coil section. Conditioned air is discharged upward. Blower located to the right of coil section. Conditioned air is discharged to the left. Blower located to the left of coil section. Conditioned air is discharged to the right. Blower located above coil section. Conditioned air is discharged downward.
Installation CLOSET INSTALLATION (RETURN AIR THRU OPENING OR GRILL) The 37AHA Hydronic Air Handler can be installed in a closet on a supporting stand or be mounted from the closet wall using the closet as the return air plenum. Unit should be high enough from the floor to provide unimpeded return air flow into the bottom of the cabinet.
Installation Attachment Methods Using Straps AIR DISTRIBUTION SYSTEM Method 1 Existing Ductwork Use (4) #8 x 3/4 sheet metal screws for each strap. The straps should be vertical against the Air Handler sides and not pull away from the Air Handler sides. It is the responsibility of the installer to inspect all previously installed air distribution system to determine its suitability for the new heating and/or cooling system.
Installation PLUMBING Mechanical Joining of Tubing: Codes: Where used, refer to respective mechanical system manufacturer’s installation instructions. Observe all local sanitary codes when installing water lines. The water supply mating connection to the 37AHA Hydronic Air-Handling Units are made via the two (3/4 in. Dia. X 2-1/2 in. Long) copper stubs to the front-left of the unit labeled “WATER IN” and “WATER OUT” (see Figure 1). Mating connectors to be two field supplied 3/4 in.
Installation Hydraulic Resistance of Fittings, Valves, and Other Devices: Before the total hydraulic resistance of a piping circuit can be found, the individual hydraulic resistances of all fittings, valves, or other such components must be determined. One approach is to consider each fitting, valve, or other device as an equivalent length of copper tube of the same pipe size (see Table 2).
Installation ¾” Tubing (total straight pipe length)....68 ft. PROCEDURE FOR CALCULATING THE TOTAL EQUIVALENT LENGTH OF PIPE (6) ¾” 90 deg. Elbows….……..6(2) = 12 ft. Given piping assembly as shown in Figure 10 below, what is the total equivalent length of the system? (2) ¾” Side port tee……….…..2(3) = 6.0 ft. (1) ¾” Taco air separator….1(0.3) = 0.3 ft. First determine the total straight pipe lengths; next refer to table 2 to determine the equivalent straight pipe length for each fitting shown.
Installation Piping Configuration STEP 1: CLOSE the air separator venting valve. When employing a Tankless Water Heater in a hydronic system, the system is considered an Open Loop System when configured to simultaneously deliver both domestic hot water and space heating. By definition, if the circuit is sealed off from the atmosphere at all locations (as is true for most modern hydronic systems) it is called a closed loop system.
Installation ELECTRICAL CONNECTIONS side) follow steps 1 thru 7 below: Line-Voltage Connections: 1. Remove and keep one screw and cover from the Control Box. U.S. INSTALLATIONS: Make all electrical connections in accordance with National Electrical Code (NEC) ANSI/NFPA 70 and all local codes or ordinances having jurisdiction. CANADIAN INSTALLATIONS: Make all electrical connections in accordance with Canadian Electrical Code CSA C22.1 and all authorities having jurisdiction.
Installation NOTES: W 1. Connect Y1 terminal as shown for proper operation. R C Single Stage Thermostat (Available Accessory) Y1 5 Wire 2. Rinnai thermostats require a “C” terminal connection as shown. 3. If any of the original wire, as supplied, must be replaced, use the same type or equivalent wire.
Installation System Low Voltage Wiring Diagrams NOTE: Local codes may require thermostat wiring to be routed through conduit or raceways. In such instances splices can be made inside the Hydronic Air Handler. All wiring must be NEC Class l and must be separated from incoming power leads. IMPORTANT: Where possible, use a Rinnai factory authorized thermostat with the 37AHA series hydronic Air Handlers. If a thermostat other than specified is used then refer to the manufacturer’s installation instructions.
Installation Dip Switch Options (Smart Operating System): THERMOSTAT INSTALLATION: The Rinnai® exclusive Smart Operating System is a feature of your 37AHA series Hydronic Air Handler’s control system that is designed to allow the installer (via DIP Switch – SW1) to configure the unit for single or two stage, A/C or Heat pump systems with selectable heat bower off delay.
Installation THERMOSTAT WIRING DIAGRAMS HEAT/COOL & COOL ONLY THERMOSTATS FIRST STAGE HEAT/COOL Y1 SINGLE STAGE AIR-HANDLER SINGLE SPEED CONDENSING UNIT Y1 Y1 Y2 AUX HEATING W W FAN G G Shunt Jumper Options: An additional feature of the 37AHA series is its selectable operating sequence option; the 3-pin shunt header (P7) allows the control to operate the proper heating logic based on the following system requirements: The 37AHA unit in Open Loop configuration: O 24VAC HOT R R 24 VAC COMMON
Installation START-UP PROCEDURE (HEATING ONLY): START-UP PROCEDURE (COOLING SYSTEM) The following conditions must be met prior to unit start-up. Refer to field supplied evaporator coil and outdoor unit manufacturer’s Installation Instructions for system hook-up, start-up instructions and refrigerant charging method details. Debris from soldering and/or other installation activities can cause equipment failure. Ensure that all associated lines and appurtenances are free of debris.
Installation NOTES: 1 2 3 4 5 6 7 8 START SYSTEM PURGED NO Pipe system between Tankless Water Heater and Air Handler ‡ Leak check piping system Purge and prime plumbing system Perform required electrical work Check system operation with power to condensing unit off (if installed) Control board is sometimes refered to as 'PCB' Air Handler is sometimes refered to as 'AHU' Typical for all check, ensure system is in the following operating mode: AC / SINGLE STAGE RETURN TO PURGE & PRIME STEPS ‡ 9 For Amp
Installation START WITH DOOR SWITCH CLOSED (SET SYSTEM IN HEATING MODE; CALL FOR HEAT) NO GO TO AHU START-UP & 'LED' TROUBLESHOOTING IS 'LED' ON YES PULSING FLASH WITH PUMP AND FAN ENERGIZED (associated with contactor clicking sound) - WRONG SHUNT POSITION FOR OPERATING MODE - REFER TO FIG.
Installation START WITH DOOR SWITCH CLOSED (SET SYSTEM IN HEATING MODE -CALL FOR HEAT) YES YES STEADY 'LED' FLASH RAPID 'LED' FLASH IS 'LED' ON NO PUMP ENERGIZED GO TO AHU START-UP & 'LED' TROUBLESHOOTING YES PUMP AMP DRAW NORMAL NO ADJUST THERMOSTAT SET TEMPERATURE HIGHER THAN ROOM TEMPERATURE PUMP ENERGIZED YES NO CHECK CAPACITOR; IF DEFECTIVE, REPLACE COMPONENT AND RE-CHECK AMP DRAW PUMP AMP DRAW NORMAL NO YES REPLACE PUMP MOTOR AND RETURN TO START NO CHECK FOR LOOSE OR BROKEN WIRES YE
Installation START WITH DOOR SWITCH CLOSED (SET SYSTEM IN HEATING MODE -CALL FOR HEAT) NO YES GO TO AIR HANDLER START UP AND 'LED' TROUBLESHOOTING IS 'LED' ON 24V BETWEEN THERMOSTAT AND PCB CHECK TRANSFORMER FOR CORRECT VOLTAGES PRI:VAC = 115V +/SEC: VAC = 24V +/- NO (1) CHECK FOR WIRING PROBLEM(S) (2) CHECK TRANSFORMER; IF DEFECTIVE, REPLACE FAULTY COMPONENT NO (1) CHECK FOR WIRING PROBLEM(S) (2) CHECK FUSE; IF DEFECTIVE, REPLACE FAULTY COMPONENT YES CHECK 3 AMP FUSE; IS FUSE INTACT YES CHECK
Sequence of Operation SEQUENCE OF OPERATION: Single-Stage Heat-Pump (HP) Cooling Demand: NOTE: Air Handler control must be grounded for proper operation; control is grounded through green wire routed to control box screw. When the thermostat calls for cooling (Y and O), the control waits for the 1 second cooling on delay period and energizes the COOL_HI blower tap.
Sequence of Operation If the FS signal is NOT present, the control will energize the circulating pump for 60 seconds in an attempt to activate the Flow Sensor (FS). If the FS signal does not become active during the time, the control will de-energize the circulating pump for 60 seconds and then start another 60 seconds with the circulating pump energized to try to activate the Flow Sensor.
Sequence of Operation If the FS input signal remains (indicating that there is adequate hot water flow) the circulator pump will remain energized, the HEAT blower speed and HUM outputs will then be energized. If the emergency heat demand (W) is removed, the HEAT blower speed will immediately be de-energized and the blower will return to the appropriate speed based on any remaining thermostat demand.
Maintenance 4. Install new motor, and reassemble circulator using the new gasket and bolts supplied. 5. Follow the “installation” procedure to start up the circulator. Replacing Pump Cartridge Assembly: 1. Disconnect the electrical supply. 2. Reduce system pressure to 0 psi and allow system to return to room temperature. Isolate the circulator by closing the service valves or draining the system. 3. Remove the body bolts and swing motor assembly away from the body. 4.
Selection Guide SELECTION PROCEDURE (WITH EXAMPLE) I. Define hot water load for the total required domestic hot water usage. To help with the sizing and selection of your new Rinnai Tankless Water Heater (TWH), refer to our website at: http://www.foreverhotwater.
Table 3: Hydronic Air Handler Specifications UNIT MODELS Trade Name RATING AND PERFORMANCE Nominal Output Capacity (BTU/h) † Air Side Temperature Rise Rate in oF ( 68ºF Entering Air @ 150ºF Entering Water) External Static Pressure Nominal Airflow (CFM) 37AHA04508KA5 37AHA06012KA5 37AHA07514KA5 37AHA09016KA5 AH45 AH60 AH75 AH90 Descriptor (Typ.) 45,000 60,000 75,000 90,000 Heat Speed 50 50 50 50 (in. W.C.) Heating Cooling Range 0.5 800 ‡ 650 - 800 0.5 1200 ‡ 650 - 1200 0.5 1400 ‡ 1000 - 1600 0.
Table 4 - Dry Coil Air Delivery (CFM w/ Filter) UNIT SIZE OPERATING MODE BLOWER SPEED ESP (in. w.c.) 0.00 0.10 0.20 37AHA04508KA5 (AH45) (Bottom or Right Side Return w/ Optional Side Filter Rack) 1-1/2 Ton A/C or HP 2 Ton A/C or HP Hydronic Heat 2 Ton A/C or HP Hydronic Heat 0.70 0.
Accessories 6. Flow Sensor FIELD SUPPLIED ACCESSORIES 1. Humidifier (HUM) Connect an auxiliary 2.5 FLA, 2.5 LRA @ 115 VAC max Humidifier (if required). Connections are made via the “HUM” quick connects. The humidifier output is on whenever a heating demand is being satisfied. The contacts of this output are isolated to allow field personnel to apply 24 VAC or 115 VAC to one terminal and the humidifier load to the other. 2.
Table 5: Performance Data with V-Series EHS 37AHA045 & 37AHA060 Nominal Heating Capacity (MBH) 37AHA06012KA5 (AH60) 37AHA04508KA5 (AH45) UNIT MODEL EHS PART NUMBER TRADE NAME BLOWER SPEED‡ ESP (in. W.C.) AIR DELIVERY (CFM)‡ 130 140 150† 160 C42e 34.2 38.0 45.8 51.1 57.0 REU-V2020WC C53e 35.3 38.2 46.4 50.7 57.5 REU-V2532WC C85e 31.0 37.0 45.3 50.0 52.6 REU-V2532WCD C85e PLUS 31.0 37.0 45.3 50.0 52.6 REU-V2520FFUC C53i 34.6 40.6 46.2 52.3 58.3 HIGH 0.
Table 6: Performance Data with V-Series EHS Unit Sizes: 37AHA075 & 37AHA090 Nominal Heating Capacity (MBH) 37AHA09016KA5 (AH90) 37AHA07514KA5 (AH75) UNIT MODEL EHS PART NUMBER TRADE NAME BLOWER SPEED‡ ESP (in. W.C.) AIR DELIVERY (CFM)‡ ENTERING WATER TEMPERATURE (OF) 120 130 140 150† 160 REU-V1616WC C42e 46.9 55.8 65.1 74.6 83.5 REU-V2020WC C53e 46.4 55.2 64.4 73.6 83.0 REU-V2532WC C85e 50.2 59.3 68.6 78.2 87.4 REU-V2532WCD C85e PLUS 50.2 59.3 68.6 78.2 87.
Table 7: Performance Data with LS-Series EHS Unit Sizes: 37AHA045 through 090 Nominal Heating Capacity (MBH) 37AHA06012KA5 (AH45) (AH60) (AH75) 37AHA07514KA5 37AHA09016KA5 (AH90) 37AHA04508KA5 UNIT MODEL EHS PART NUMBER TRADE NAME REU-VA2528WD R75LSe REU-VA2528FFUD R75LSi BLOWER SPEED‡ ESP (in. W.C.) HIGH 0.5 AIR DELIVERY (CFM)‡ ENTERING WATER TEMPERATURE (OF) 120 130 140 150† 160 33.1 39.2 45.3 51.4 58.2 32.6 38.4 44.5 50.6 56.2 800 REU-VA2535WD R94LSe 32.2 37.8 43.
37AHA045 Wiring Diagram WHITE 15 26 20 BLACK/WHITE BLACK WHITE YELLOW 4 CONTROL BOARD 19 RED/WHITE 11 BLUE BLOWER CAPACITOR RED BLACK BROWN BROWN WHITE BLACK 26 COM 5 BLACK RED 16 20 120V WHITE TRANSFORMER 10 14 BLK- HI BLU- MED. HIGH ORG-MED. LOW RED- LOW BRN- CAP. WHT- COM. 24V GREEN 13 PUMP CAPA CITOR 24V 13 7 15 DOOR SWITCH 115/60/1 FIELD WIRING 18 17 ! DANGER *ELECTRICAL SHOCK HAZARD *DISCONNECT POWER BEFORE SERVICING.
37AHA060 Wiring Diagram WHITE 15 26 20 BLACK/WHITE BLACK WHITE YELLOW 4 CONTROL BOARD 19 RED/WHITE 11 RED ORANGE BLUE BLACK BROWN BROWN WHITE BLACK BLOWER CAPACITOR 26 COM 5 BLACK RED 16 20 120V WHITE TRANSFORMER 10 14 BLK- HI BLU- MED. HIGH ORG-MED. LOW RED- LOW BRN- CAP. WHT- COM. 24V GREEN 13 PUMP CAPA CITOR 24V 13 7 15 DOOR SWITCH 115/60/1 FIELD WIRING 18 17 ! DANGER *ELECTRICAL SHOCK HAZARD *DISCONNECT POWER BEFORE SERVICING.
AHA075 and 37AHA090 Wiring Diagram WHITE 15 26 20 BLACK/WHITE WHITE YELLOW 4 CONTROL BOARD BLUE RED ORANGE BLACK BROWN BROWN WHITE BLACK RED/WHITE 11 BLOWER CAPACITOR 26 COM 5 BLACK RED 16 20 120V WHITE TRANSFORMER 10 14 BLK- HI BLU- MED. HIGH ORG-MED. LOW RED- LOW BRN- CAP. WHT- COM. 24V GREEN 13 PUMP CAPA CITOR 24V 13 7 15 DOOR SWITCH 115/60/1 FIELD WIRING 18 17 ! DANGER *ELECTRICAL SHOCK HAZARD *DISCONNECT POWER BEFORE SERVICING.
Parts List Figure 28: Unit Assembly UNIT ASSEMBLY Balloon Number 1 Part Number 608000010 608000011 608000012 608000013 2 3 609000018 4 607000011 607000010 5 609000019 6 609000052 609000020 609000021 609000022 609000023 609000024 609000025 609000026 609000027 7 8 38 UNIT ASSEMBLY MODEL 37AHA 37AHA 37AHA 37AHA Description 045 060 075 090 Complete Blower X Assembly-See X blower assembly X section for individual parts X Filter Retention Wire X X X 2 3/4” Pump Adaptor Set 2 2 2 2 Hydronic Pump X
Parts List 1 CONTROL PANEL Balloon Number Part Number 1 605000010 Description Control Board X X 2 605000015 Transformer X X X 3 605000014 X X X 4 605000018 Door Switch Pump Capacitor X X X 5 5 605000016 605000017 Blower Capacitor 605000011 605000012 605000013 (sizes 045, 060) (size 075) (size 090) X X X Blower Capacitor X 2 4 3 SEXP-492 Figure 29: Control Panel BLOWER ASSEMBLY Balloon Number Part Number Description 609000053 609000054 Blower 1 Housing 609000055 609000056
Limited Warranty Warranty Information The installer is responsible for the correct installation of your Hydronic Air Handler. Please complete the information below to keep for your records: Purchased from: _________________________________________________________________ Address: _____________________________ Phone: _________________________________ _____________________________ Date of Purchase: __________________________________ Model No.: ________________________________________ Serial No.
Limited Warranty What will Rinnai do? Rinnai will repair or replace the covered product or any part or component that is defective in materials or workmanship as set forth. Labor will only be covered when the Air Handler is connected to a Rinnai tankless water heater. Labor is not covered if connected to any other type or brand of unit. Rinnai will pay reasonable labor charges associated with the repair or replacement of any such part or component. All repair parts must be genuine Rinnai parts.
Notes 42 Rinnai Corporation Hydronic Air Handler Manual
Notes Rinnai Corporation Hydronic Air Handler Manual 43
Rinnai’s other fine products Rinnai America Corporation 103 International Drive Peachtree City, GA 30269 TOLL FREE: 1-800-621-9419 www.rinnai.us Tankless Water Heaters • • • • • • • • Residential and Commercial Applications Continuous Hot Water Up to 9.
