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Rinnai Corporation Hydronic Furnace (37AHB) Manual 59
Accessories
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. Electronic Air Cleaner (EAC)
Connect an auxiliary Electronic Air Cleaner (if
required); rating shall be max 1.0 Amp @ 115
VAC. This output is energized whenever any of the
four blower speeds are energized. Connections
are made via 0.250 x 0.032” male quick connect
terminals labeled "EAC" and "N3".
3. UV Lamp
Connect an auxiliary UV lamp (if required); rating
shall be max 1.0 Amp @ 115 VAC. This output is
energized whenever any of the four blower speeds
are energized. Connections are made via 0.250 x
0.032” male quick connect terminals labeled "UV"
and "N2"
4. Filter Rack & Bottom Fill Plates
Refer to Figures 3 and 4 in this manual and the
table below:
5. Thermostats
The Standard Model thermostat is an electronic
24 vac, programmable, manual changeover wall
-mount thermostat. This thermostat uses two set
points to maintain and control room temperature in
both the heating and air conditioning modes. 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.
6. Flow Sensor
Refer to the plumbing section of this manual for
installation instructions. The sensor is packaged
with the hydronic furnace in the literature bag
affixed between the filter and filter retention wire.
7. Anti-scald Thermostatic Temperature Control
Valve
Anti-scald thermostatic temperature control valves
are an important part of domestic water plumbing
because they eliminate the scalding and cold water
shocks that can occur in a shower when a toilet is
flushed or a faucet is turned on. In an Open Loop
system (dual function – space heating and
domestic water heating), an anti-scald valve should
be installed when the Tankless Water heater set
thermostat is above 120°F (49°C); refer to local
codes and/or all authority having jurisdiction. For
recommended piping configuration refer to Figure
11. Anti-Scald valve shall be thermostatically
controlled and meet at least the following
specifications:
• Dual certification ASSE 1016-T and ASSE 1017
• IAPMO Approved
• CSA Approved
Constant water temperature under different
operating conditions.
An approved anti-scald/anti-chill thermostatic
temperature control valve is available through the
Rinnai® Accessory Program.
Part Part Number
Thermostatic Mixing Valve 603000016
Sensor, Flow Actuated 603000010
Part Part Number
Bottom Fill Plate 37AHB045 603000011
Bottom Fill Plate 37AHB060 603000012
Bottom Fill Plate 37AHB075 603000013
Bottom Fill Plate 37AHB090 603000014
Side Filter Rack 37AHB 603000015
Part Model Part Number
Part Part Number
AC Thermostat 603000018
Heat Pump Thermostat 603000021