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Rinnai Corporation Hydronic Furnace (37AHB) Manual
Maintenance
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.
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. Sequential attempts to activate the Flow
Sensor will use 60 second, 120 second and 180
second de-energized periods for the circulating pump.
The de-energized period will circle back to the original
60 second off period following sequential unsuccessful
energized attempt to activate the Flow Sensor. During
this time the Status LED will rapidly flash, indicating
that a heat demand is present, but not being satisfied
because of the state of the FS input signal.
If the FS input signal again becomes present within
the same emergency heating demand (W), the pump
will begin jogging (as described in the above
paragraph), normal emergency heating operation will
resume.
Heat Blower OFF Delay:
When the heating thermostat demand is removed, the
control immediately de-energizes the circulating pump
and then de-energizes the indoor blower motor and
humidifier after a fixed 30 second blower off delay.
Blower timing begins when the thermostat is satisfied.
The control returns to standby when the blower off
time is complete.
If the thermostat call for emergency heat returns
before the blower off delay is complete, the control
resumes an emergency heating sequence as defined.
Off Season Circulation Timer
All Rinnai® Hydronic Furnace models are equipped
with a circulation timer. It is normal operation for these
models to automatically run the circulation pump for a
period of two minutes intermittently every six hours if
there has not been a call for heat within the said six
hours.
The unit also incorporates the unique feature of
learning the household schedule to determine the best
six hour intervals (periods of least flow interruption) to
run the circulator timer.
Repairs should be performed by a qualified service
technician. The appliance should be inspected
annually by a qualified service technician. Verify
proper operation after servicing.
CLEANING
It is important that compartments, filter, and circulating
air passage ways of the appliance be kept clean.
Clean as follows:
1. Turn off and disconnect electrical power. Allow to
cool.
2. Replace the air filter. (Should be done at least
quarterly. Refer to the Specifications section for
sizes.)
3. Use pressurized air to remove dust from the
components.
4. Use soft dry cloth to wipe cabinet.
SUPPLY AND RETURN AIR DUCT SYSTEMS
The supply and return air ducts should be inspected at
least annually for blockages or damage.
MOTORS
Both the fan and pump motors are permanently
lubricated and do not need periodic lubrication. Keep
free of dust and dirt by cleaning annually.
INTEGRAL CIRCULATOR PUMP
Replacing Pump Motor 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 volute.