– 12 –
P/N SCM2-0111
Model
SCM
Air to Water Heat Pump — Installation, Operation & Maintenance Manual
Section 7: Start-up and test
BEFORE starting the unit
Electrical shock hazard
— Disconnect all electri-
cal power before proceeding with the following.
❑
Verify that the system and all components have been in-
stalled in accordance with this manual and all applicable
codes and instructions.
❑
Inspect the SpacePak heat pump/chiller and all other system
components. All components should be in good condition
and operational.
❑
Inspect the water piping for any signs of leakage.
Repair all system leaks. Leakage will cause pressure
to drop, preventing the heat pump/chiller from oper-
ating. Leaks also allow introduction of excess make-
up water, whether filled automatically or manually.
❑
Check system pressure. The pressure should be at least
15 PSIG with heat pump/chiller not in operation.
❑
Check all wiring connections to ensure terminal connections
are tight and all wiring is in place.
Start the SpacePak heat pump/chiller
Start in cooling mode.
1. Apply power to the unit
2. The display (Figure 12, page 13) should show the start se-
quence — uC2, then 2.0, then the current water tempera-
ture. No other symbol should appear.
3. When the display shows only temperature, lower the thermo-
stat setpoint below the current room temperature.
4. This begins a call for cooling, and the pump symbol will begin
to flash.
5. After 1 to 2 minutes, the pump symbol will change to con-
stant display, and the pump will begin circulating.
6. Assuming the water is outside of the cooling temperature
range (above 42 deg) the refrigeration system will initiate
and the 1, or 3, or both numerals will begin flashing.
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
Heating (if applicable) and raise the set point above current
room temperature.
2. This initiates a call in Heating mode. The pump symbol will
begin flashing.
3. After 1 to 2 minutes, the pump symbol will change to con-
stant display, and the pump will begin circulating.
4. Assuming the water is outside of the heating temperature
range (below 120 deg) the refrigeration system will initiate
and the 1, or 3, or both numerals will begin flashing.
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).
Anti-freeze cycle
1. Should the water temperature drop to 34°F during periods of
non-use, the pump will start and the antifreeze heater (op-
tional, when installed) will energize and continue to operate
until the temperature reaches 38°F.
2. If the water temperature continues to fall and reaches 33°F,
the Alarm symbol and Fault Code AL will be displayed, and
the unit will automatically start in heating mode. It will con-
tinue to run until the water temperature reaches 38°F.
3. NOTE: This provides the maximum level of protection in all
cases, but may use energy unnecessarily when a suitable
concentration of glycol anti-freeze is installed. When freeze
protection is sufficient, these value can be adjusted to low-
er temperatures. Contact technical support for guidance in
re-configuring these parameters, however it must be under-
stood that the installer is responsible for ensuring sufficient
freeze protection to the lowest temperature allowed.
24-Hour follow-up
Approximately 24 hours after start-up and testing, return to the
installation to verify proper operation. Perform the following
checks.
❑
Check system pressure. Add additional glycol/water mixture
if needed to restore pressure. (Pressure can drop as air is
removed from the system by the air vents.)
❑
Sample the glycol/water mixture in the system. Verify inhibi-
tor and glycol levels.
❑
Inspect the piping and components to ensure there are no
leaks. Repair any leaks immediately.
❑
Close the isolation valves on either side of the y-strainer at
the SpacePak heat pump/chiller return connection. Remove
the screen and inspect for sediment. Clean if necessary.
• If the strainer has become clogged with sediment, deter-
mine whether the system needs to be drained, cleaned
and re-filled. Excessive sediment accumulation in the
strainer will reduce flow and cause the unit to shut down.
❑
Cycle the system on heating and cooling. Verify that all com-
ponents operate correctly.
