12 | Sequence of operation WW & WT Models
WW & WT Models8733943362 (2016/08) Subject to change without prior notice
Figure # 7
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 access cover and restore
electrical or fuel supply to water heater.
Initial Start-Up
1. Turn on the heat pump. The HR pump 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 should
shut off when the water temperature entering the
heat recovery reaches 120°F.
SEQUENCE OF OPERATION
Cooling Mode
Energizing the “O” terminal energizes the unit reversing
valve thus placing the unit into cooling mode. T
When the thermostat calls for first stage cooling (Y1) the
loop pump or solenoid valve if present is energized and
the first stage of compressor capacity starts.
When the thermostat calls for second stage cooling (Y2)
the second stage (or full compressor capacity) is
initiated. Once the thermostat is satisfied, the
compressor shuts down accordingly
Heating Mode
The first two stages of heating (Y1 & Y2) operate in the
same manner as cooling, but with the reversing valve de-
energized. Once the thermostat is satisfied, the
compressor shuts down,
NOTE: Diagram for illustration purposes only.
Ensure access to Heat Pump is not restricted.
NOTICE: Make sure all valves in heat
recovery water piping system are open.
NEVER OPERATE HR PUMP DRY.
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