Fan Motor Options
13.4 Water Tank Refill
1. Open the cold water supply to the tank.
2. Open a hot water faucet to vent air from the system until
water flows from the faucet, then close.
3. Depress the hot water tank pressure relief valve handle to
ensure there is no air remaining in the tank.
4. Carefully inspect all plumbing for water leaks. Correct as
required.
5. Purge all air from HR through an external purge valve. Allow
all air to bleed out until water appears at the valve. Locate
the external purge value at the highest point in the
installation.
6. Before restoring the power or fuel supply to the water
heater, adjust the temperature setting on the tank
thermostat(s) to ensure maximum utilization of the heat
available from the refrigeration system and conserve the
most energy. On tanks with both upper and lower elements
and thermostats, the lower element should be turned down
to 100° F, while the upper element should be adjusted to
120° F. Depending upon the specific needs of the customer,
you may need to adjust the upper element differently. On
tanks with a single thermostat lower the thermostat setting
to 120° F or the “LOW” position.
After thermostat adjustments are completed, replace the
access cover and restore the electrical or fuel supply to the
water heater.
13.5 Initial Start-Up of a HRP System
CAUTION
Make sure all valves in the heat recovery water piping system
are open. NEVER OPERATE THE HEAT RECOVERY PUMP DRY.
1. Turn ON the heat pump. The Heat Recovery ump should not
run if the compressor is not running.
2. Turn HR switch to the “ON” position. The pump will operate
if entering water temperature to HR is below 120°F.
3. The temperature difference between the water entering and
leaving the heat recovery should be 5° to 15°F.
4. Allow the unit to operate for 20 to 30 minutes to ensure it is
functioning properly. The pump will shut off when the Heat
Recovery entering water temperature reaches 120°F.
14 Fan Motor Options
14.1 Constant Torque Motors (ECM)
For installations where the efficiency of an electronically-
commutated, brushless DC motor (ECM) motor is required, but
the features of a constant airflow motor are not required, the RF
series is offered with a constant torque ECM motor option.
Constant Torque motors are wired as follows from factory:
For unit sizes 7, 9, and 12 motors are provided with 4 speed
taps:
Tap 1: F
an Only operation
Tap 2: Passive Dehumidification
Tap 3: Full Load
Tap 4: Extra speed tap. Not connected from factory
About Passive Dehumidification (Tab 2): A passive
dehumid
ification mode reduces fan airflow when
dehumidification is requested by the thermostat—this reduces
the sensible heat ratio of the cooling coil and extends cooling run
time to more effectively dehumidify.
Refer to the constant torque motor performance tables below
for heat pump blower performance with the constant torque
motor option.
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RF Series Heat Pumps — 8733980022 (2024/12)
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