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Model SCM Air to Water Heat Pump — Installation, Operation & Maintenance Manual
START UP IN HEATING MODE
____ Once pump has stopped, change the thermostat to Heating (if applicable) and raise the
set point above the current room temperature.
____ Pump symbol will being to flash as a call for heat is made
____ After 1-2 minutes pump symbol will remain constant
____
Once water is outside the cooling temperature range (below 120°F) the refrigeration
system initiates and the 1, 3, or both numerals will begin flashing
____ After 1-2 minutes the 1, 3, or both numerals will remain constant, the compressor
symbol will come on and one or both compressors will start
____ Observe for any alarms, errors, or faulty operation (noise, vibration etc)
24 HOUR FOLLOW UP
24 Hours after start up the following checks should be performed:
____ Check System Pressure (add glycol/water mixture if needed to restore pressure)
____ Sample and verify glycol/water mixture
____ Inspect all piping and components for leaks
____ Close isolation valves on either side of the y-strainer at the heat pump return
connection
____ Remove the screen and inspect for sediment, clean if necessary
If the strainer is clogged determine if system needs to be drained and re-filled.
Excessive sediment buildup will cause reduced flow and the system will shut down
____ Cycle the system in both heating and cooling
____ Verify that all components operate correctly
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