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Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual
3. Inspect the water piping for any signs of leakage.
Repair all system leaks. Leakage will cause pressure
to drop, preventing the heat pump from operating.
Leaks also allow introduction of excess make-up
water, whether lled automatically or manually.
4. Check system pressure. The pressure should be at least
15 PSIG with heat pump not in operation.
5. Check all wiring connections to ensure terminal connections
are tight and all wiring is in place.
Start the SpacePak heat pump
Start in cooling mode.
1. Apply power to the unit
2. The display (Figure 1) should show the start sequence —
uC2, then 2.0, then the current water temperature. No other
symbol should appear.
3. When the display shows only temperature, lower the
thermostat setpoint below the current room temperature.
4. This begins a call for cooling, and the pump symbol will begin
to ash.
5. After 1 to 2 minutes, the pump symbol will change to constant
display, and the pump will begin circulating.
6. Assuming the water is outside of the cooling temperature
range (above 42°) the refrigeration system will initiate and
the 1, or 3, or both numerals will begin ashing.
7. After 1 to 2 minutes, the 1, or 3, or both numerals will change
to constant, the compressor symbol will turn on and one or
both compressors will start.
8. Observe for any alarms, errors, or faulty operation (noises,
vibration, etc)
9. When operation is deemed satisfactory, raise the thermostat
set-point or turn it off.
10. The pump will run for approximately two minutes after the
compressor shutdown.
Start in heating mode.
1. When the pump has stopped, change the thermostat to Heat-
ing (if applicable) and raise the set point above current room
temperature.
2. This initiates a call in Heating mode. The pump symbol will
begin ashing.
3. After 1 to 2 minutes, the pump symbol will change to constant
display, and the pump will begin circulating.
4. Assuming the water is outside of the heating temperature
range (below 120°) the refrigeration system will initiate and
the 1, or 3, or both numerals will begin ashing.
5. After 1 to 2 minutes, the 1, or 3, or both numerals will change
to constant, the compressor symbol will turn on and one or
both compressors will start.
6. Observe for any alarms, errors, or faulty operation (noises,
vibration, etc).
See the above illustration; note this is not intended to include all
components in the system, just the minimum to properly purge
air from the heat pump.
1. With the heat pump isolated and dry, valves A & B closed,
charge the “system”(that is, all the plumbing not shown), and
remove as much air as possible through the air separator.
2. Apply a static pressure to the system, with all pumps off, of
15-25 PSI.
3. Very gradually open the lower ball valve, B, to allow water un-
der pressure to begin to ll the heat pump from the bottom.
4. Crack the manual vent valve until you hear air escaping.
5. Allow the water to continue to ll the heat pump, displacing air.
This should go very slowly, and could take a minute or more.
6. When all the air has been displaced and a steady stream of
water is owing out of the vent valve, fully open ball valve B.
7. Open ball valve A, a small amount of air might escape the
vent valve from the heat pump supply line.
8. When all the air has escaped, close the vent valve.
Note, this procedure lls the heat pumps in the opposite direction
of normal ow, so it must be done when all pumps are off.
BEFORE starting the unit
Electrical shock hazard — Disconnect all electrical
power before proceeding with the following.
1. Verify that the system and all components have been in-
stalled in accordance with this manual and all applicable
codes and instructions.
2. Inspect the SpacePak heat pump and all other system com-
ponents. All components should be in good condition and
operational.
PURGE VALVE
(MANUAL)
A
B
Section 8: Start-up and Test
Figure 14
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