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2100-536 Rev A
37AHB SERIES
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 ..................................................... 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
To register your hydronic furnace or tankless water heater,
please visit www.rinnairegistration.com
.
Quality Assurance
This product is manufactured in a
facility registered by UL to ISO 9001.