Rinnai 37AHB SERIES Installation, Operation And Maintenance Manual
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Rinnai 37AHB SERIES Installation, Operation And Maintenance Manual

37ahb series hydronic furnace sizes 045 thru 090
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Installation, Operation, and Maintenance Manual
Quality Assurance
This product is manufactured in a
facility registered by UL to ISO 9001.
HYDRONIC FURNACE
SIZES 045 THRU 090
Consumer Safety Information ................................ 2
Model Number Nomenclature ................................ 3
Physical Data ......................................................... 4
Receiving & Checking Equipment ......................... 5
Clearances ..................................................... 5
Locating and Mounting ............................... 6-9
Plumbing ................................................. 10-13
Electrical Connections ............................ 14-16
Dip Switch Options ....................................... 17
Thermostat Installation............................ 17-18
Start-Up Procedure ...................................... 19
Troubleshooting ...................................... 20-23
Sequence of Operation ................................... 24-26
Maintenance................................................... 26, 27
Selection Guide .............................................. 27, 28
Air Distribution Guide ..................................... 28, 29
Quick Reference Duct Sizing Chart .................... 30
Hydronic Furnace's Specifications ....................... 31
Air Delivery and Performance Data ................ 32-51
Accessories .......................................................... 59
Wiring Diagrams ............................................. 60-62
Parts List ......................................................... 63-64
Limited Warranty ............................................. 65-66
37AHB SERIES
2100-536 Rev A

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Summary of Contents for Rinnai 37AHB SERIES

  • Page 1: Table Of Contents

    HYDRONIC FURNACE SIZES 045 THRU 090 Installation, Operation, and Maintenance Manual Consumer Safety Information ........ 2 Overview of the Rinnai Hydronic Furnace .... 3 Model Number Nomenclature ........ 3 Physical Data ............4 Receiving & Checking Equipment ......5 Installation Clearances .............

  • Page 2: Consumer Safety Information

    The qualified installer or agent must use factory authorized kits and/or accessories when installing this product. Refer to the appropriate Rinnai® literature for listing. Read the entire instruction manual before starting the installation. Rinnai Corporation Hydronic Furnace (37AHB) Manual...

  • Page 3: Overview Of The Rinnai Hydronic Furnace

    HVAC Systems and Equipment Handbook Chapters 9 These unique Hydronic Furnaces are designed to and 16 work in combination with our line of Rinnai® tankless products to deliver a wide variety of heating capacities US and CANADA: Air Conditioning Contractors...

  • Page 4: Physical Data

    Entry (Typ. for both sides) 34" 17 13/16" Water Out 2 1/8" 17 13/16" Water In 18 5/16" 1" 7/8” Dia. KO Supply 6" Power Wire Entry (Typ. for both sides) 22" 1 3/8" Figure 1 Rinnai Corporation Hydronic Furnace (37AHB) Manual...

  • Page 5: Receiving & Checking Equipment

    If Installation The 37AHB Series Hydronic Furnace needs to be TOP/PLENUM zero installed and commissioned by a knowledgeable qualified professional.

  • Page 6: Locating And Mounting

    Installation LOCATING AND MOUNTING THE HYDRONIC FURNACE General The multi-position 37AHB Series Hydronic Furnaces are shipped in packaged configuration. This means that the units may be installed without assembly and/ or modifications when configured for bottom return air 17 15/16"...
  • Page 7 Refer to the Rinnai Accessory list for installation. If side return air inlet installation is desired details. For side filter rack installation instructions refer to Figures 3 and 4.
  • Page 8 8” MIN FOR DOOR REMOVAL USE 1” SQUARE, 1-1/4 x 1-1/4 x 1/4 (2) HEX NUTS, (2) WASHERS & (2) ANGLE IRON OR EQUIVALENT LOCK WASHERS REQ. PER ROD Horizontal Unit Suspension Figure 6: Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 9 Internal filter rack and a 1 inch disposable filter are Multiple Furnace configured for installation with a standard on all models. Refer to the Specifications single Rinnai Tankless Water Heater is prohibited. section for dimensions. Rinnai Corporation Hydronic Furnace (37AHB) Manual...

  • Page 10: Plumbing

    Copper Tubing Support: other appurtenances (exclusive of those indicted as Copper tubing must be properly supported to prevent accessories that are available through Rinnai sagging or buckling. On horizontal runs with hard distribution) called for in piping schematics to be field- temper tubing, the following maximum support spacing supplied.
  • Page 11 To prevent this from occurring, all modern hydronic systems MUST be equipped with an expansion tank. Refer to expansion tank manufacture’s instructions for proper sizing and installation. Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 12 First determine the total straight pipe lengths; next refer to table 2 to determine the equivalent straight (1) ¾” Rinnai flow sensor..1(3.2) = 3.2 ft. pipe length for each fitting shown. Add together the (2) ¾” Ball valves….….…..2(2.2) = 4.4 ft.
  • Page 13 Conversely If the circuit is open to the atmosphere at any point, it is called an open loop system. Current STEP 5: OPEN cold water supply main valve (ball Rinnai tankless products are not certified for closed valve 1 - BV ). The system will begin the prime/purge loop applications.

  • Page 14: Electrical Connections

    7. Route Control Box wiring within unit away from hot factory location of Control Box is suitable, proceed to surfaces, sharp edges and rotating parts. next section. To relocate the Control Box to an alternate location (blower compartment upper right Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 15 WARNING Failure to follow this warning could result in a fire. Do not use aluminum wire between the Hydronic Furnace and the disconnect switch. USE COPPER WIRE ONLY. Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 16 Installation IMPORTANT: Where possible, use a Rinnai factory System Low Voltage Wiring Diagrams authorized thermostat with the 37AHB series Hydronic NOTE: Local codes may require thermostat wiring to Furnaces. If a thermostat other than specified is used, be routed through conduit or raceways. In such refer to the manufacturer’s installation instructions for...

  • Page 17: Dip Switch Options

    Installation Dip Switch Options (Smart Operating System): THERMOSTAT INSTALLATION: The Rinnai® exclusive Smart Operating System is a Safety Considerations: feature of your 37AHB series Hydronic Furnace’s All wiring must conform to local and national electrical control system that is designed to allow the installer codes.
  • Page 18 Installation THERMOSTAT WIRING DIAGRAMS Shunt Jumper Options: An additional feature of the 37AHB series is its SINGLE SPEED HEAT/COOL & COOL ONLY SINGLE STAGE CONDENSING THERMOSTATS HYDRONIC FURNACE UNIT selectable operating sequence option; the 3-pin shunt header (P7) allows the control to operate the proper...

  • Page 19: Start-Up Procedure

    Motor vibrates or is Loose or Turn off motor. Tighten fan excessively defective fan set screw or replace fan. noisy Rinnai Corporation Hydronic Furnace (37AHB) Manual...

  • Page 20: Troubleshooting

    AND RETURN TO START GO TO 24 VOLTS TROUBLESHOOTING CHART IS 'LED' ON ‡ Refer to plumbing section in this manual Hydronic Furnace Start-Up and ‘LED’ Troubleshooting - Flow Sensor (FS Configuration) Figure 20: Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 21 AMP DRAW RETURN TO START RECONNECT WIRES AND CONFIRM THAT WIRING IS AS PER WIRING DIAGRAMS SYSTEM CONTACT TECH. WORKING SUPPORT SYSTEM FINISH WORKING Blower System 115V Troubleshooting - Flow Sensor (FS) Configuration Figure 21: Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 22 AMP DRAW RETURN TO START RECONNECT WIRES AND CONFIRM THAT WIRING IS AS PER WIRING DIAGRAMS SYSTEM CONTACT TECH. WORKING SUPPORT SYSTEM FINISH WORKING Circulating Pump 115V Troubleshooting - Flow Sensor (FS) Configuration Figure 22: Rinnai Corporation Hydronic Furnace (37AHB) Manual...

  • Page 23: Troubleshooting

    FINISH 24V BETWEEN CONDENSING UNIT AND PCB If a condensing unit and cased coil set is used in conjunction with the Rinnai Hydronic Furnace for cooling, refer to air conditioning manufacturer's instructions for hook-up and troubleshooting details. 24V Troubleshooting - Flow Sensor (FS) Configuration...

  • Page 24: Sequence Of Operation

    If the call for cool goes away while a call for energizes the circulating pump if the FS signal is heat exists, the cooling off delay is canceled and the present. blower operation reverts to the heat cycle. Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 25 (W), de-energizes the indoor blower motor and humidifier the circulator pump will immediately be energized. after a delay time as defined by the dip switch settings in Figure 15. Rinnai Corporation Hydronic Furnace (37AHB) Manual...

  • Page 26: Maintenance

    60 Off Season Circulation Timer seconds and then start another 60 seconds with the All Rinnai® Hydronic Furnace models are equipped circulating pump energized to try to activate the Flow with a circulation timer. It is normal operation for these Sensor.

  • Page 27: Selection Guide

    1. Replacement capacitor must have same rating as originally furnished. 4. Pull cartridge out of the motor housing. Selection Guide Hydronic Furnace and Tankless Water heater Sizing Guidelines Figure 24: Rinnai Corporation Hydronic Furnace (37AHB) Manual...

  • Page 28: Air Distribution Guide

    REU-KA2530FFUD-US (RC80HPi) and your Filter Pressure Drop………..0.0 in. WC calculated heat gain and heat loss values are as (0.0 inches if the included Rinnai filter is used; 0.08 if stated in section II. another filter is used. Refer to the filter’s manufacturer’s instructions).

  • Page 29: Air Distribution Guide

    Additionally, when laying out the header section for a information about duct sizing (specific to hi-velocity typical high velocity system, the following factor must system) and the redesigned 37AHB series furnaces be considered: respectively. Unless space conditions dictate otherwise, the...

  • Page 30: Quick Reference Duct Sizing Chart

    Air Distribution Guide Rinnai Corporation Hydronic Furnace (37AHB) Manual...

  • Page 31: Hydronic Furnace's Specifications

    UNIT WEIGHT Shipping Installed (with water) Rinnai is continually updating and improving products. Therefore, specifications are subject to change without prior notice. † Tested in accordance with ANSI/ASHRAE Standard 37-Latest edition. Side intake filter to be (1) 20”x20”x1” typical for all models.

  • Page 32: Air Delivery And Performance Data

    (WD)-US REU-KA3237FFUD 37AHB04508KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 33 REU-KA2530FFUD(WD)-US 37AHB04508KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 34 REU-KA3237FFUD(WD)-US 37AHB06012KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 35 REU-KA2530FFUD(WD)-US 37AHB06012KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 36 REU-KA3237FFUD(WD)-US 37AHB07514KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 37 REU-KA2530FFUD(WD)-US 37AHB07514KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 38 REU-KA3237FFUD(WD)-US 37AHB09016KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 39 REU-KA2530FFUD(WD)-US 37AHB09016KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 40 REU-VB2020FFUD-US 37AHB04508KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 41 REU-VB2528FFUD(WD)-US 37AHB04508KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 42 REU-VB2735FFUD(WD)-US 37AHB04508KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 43 REU-VB2020FFUD-US 37AHB06012KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 44 REU-VB2528FFUD(WD)-US 37AHB06012KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 45 REU-VB2735FFUD(WD)-US 37AHB06012KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 46 REU-VB2528FFUD(WD)-US 37AHB07514KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 47 REU-VB2735FFUD(WD)-US 37AHB07514KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 48 REU-VB2528FFUD(WD)-US 37AHB09016KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 49 REU-VB2735FFUD(WD)-US 37AHB09016KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 50 REU-VA3237FFU(W)-US/ASME 37AHB04508KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 51 REU-VA2024WD(A)-UC 37AHB04508KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 52 REU-VA2019FFUD 37AHB04508KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 53 REU-VAM1620W 37AHB04508KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 54 REU-VA3237FFU(W)-US/ASME 37AHB06012KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 55 REU-VA2024WD(A)-UC 37AHB06012KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 56 REU-VA2019FFUD 37AHB06012KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 57 REU-VA3237FFU(W)-US/ASME 37AHB07514KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 58 REU-VA3237FFU(W)-US/ASME 37AHB09016KA5 Rinnai Corporation Hydronic Furnace (37AHB) Manual...

  • Page 59: Accessories

    The thermostat is designed to maintain +/-2°F accuracy. No batteries are required; temperature, blower, mode, and installer configuration settings are preserved with power off. Part Part Number AC Thermostat 603000018 Heat Pump Thermostat 603000021 Rinnai Corporation Hydronic Furnace (37AHB) Manual...

  • Page 60: Wiring Diagrams

    37AHB045 Wiring Diagram Figure 27 Rinnai Corporation Hydronic Furnace (37AHB) Manual...
  • Page 61 37AHB060 Wiring Diagram Figure 28 Rinnai Corporation Hydronic Furnace (37AHB) Manual...

  • Page 62: Wiring Diagrams

    37AHB075 and 37AHB090 Wiring Diagram Figure 29 Rinnai Corporation Hydronic Furnace (37AHB) Manual...

  • Page 63: Parts List

    609000052 Compartment 607000012 Cover 607000013 Water Coil 609000020 607000014 609000021 607000015 Lower Front Fill 609000022 609000044 Coil 609000023 609000045 Attachment 609000024 609000046 Bracket 609000025 Lower Front 609000047 Service Door 609000026 609000048 Coil Support 609000027 Rinnai Corporation Hydronic Furnace (37AHB) Manual...

  • Page 64: Parts List

    608000020 609000058 Right Blower 605000025 1/2 HP Motor 605000027 3/4 HP Motor 605000028 1 HP Motor 609000059 Motor Mount 608000021 608000022 Blower Wheel 608000023 608000024 605000030 Fan Motor Harness 605000031 Figure 32: Blower Assembly Rinnai Corporation Hydronic Furnace (37AHB) Manual...

  • Page 65: Limited Warranty

    * In order to receive full warranty coverage on the furnace when connected to any other type or brand of product other than a Rinnai tankless water heater, the flow rate through the furnace must not exceed a maximum of 5 GPM.

  • Page 66: Limited Warranty

    Replacement of the product may be authorized by Rinnai only. Rinnai does not authorize any person or company to assume for it any obligation or liability in connection with the replacement of the product. If Rinnai determines that repair of a product is not possible, Rinnai will replace the product with a comparable product at Rinnai’s discretion.
  • Page 67 Notes Rinnai Corporation Hydronic Furnace (37AHB) Manual...

This manual is also suitable for:

37ahb04508ka537ahb06012ka537ahb07514ka537ahb09016ka5

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