Start-up
10 Start-up
Use the procedure below to initiate a proper start-up.
DANGER
Electrical Shock
Disconnect switch is only to be closed when the electrical box
cover is
secured to electrical box and all exterior panels are
secured on the unit.
1. Restore power to system.
2. Turn thermostat fan position to ON. Blower should start.
3. Balance airflow at registers.
4. Adjust all valves to the full-open position and turn ON the line
power to the heat pump unit.
5. Operate unit in the cooling cycle first, then the heating cycle
for unit operating limits. Allow 5 minutes between cooling
and heating tests for pressure to equalize.
10.1 Unit Start Up Cooling Mode
1. Adjust the unit thermostat to the warmest position. Slowly
reduce the thermostat position until the compressor
activates.
2. Check for cool air delivery at unit grille a few minutes after
the unit has begun to operate.
3. Verify that the compressors are ON and that the water flow
rate is correct.
4. Check elevation and cleanliness of the condensate lines; any
dripping could be a sign of a blocked line. Be sure the
condensate trap includes a water seal.
5. Check the temperature of both supply and discharge water.
6. Check air temperature drop across the coil when
compressors are operating.
10.2 Unit Start Up Heating Mode
Operate the unit in heating cycle after checking the cooling
cycle. Allow 5 minutes between tests for the pressures to
equalize.
1. Turn thermostat to lowest setting and set thermostat switch
to HEAT position.
2. Slowly turn the thermostat to a higher temperature until the
compressor activates.
3. Check for warm air delivery at the unit grille within a few
minutes after the unit has begun to operate.
4. Check the temperature of both supply and discharge water.
If temperature is within range, proceed. If temperature is
outside the range, check the heating refrigerant pressures.
5. Once the unit has begun to run, check for warm air delivery
at the unit grille.
6. Check air temperature rise across the coil when compressor
is operating.
7. Check for vibration, noise, and water leaks.
11 Commissioning
Record all system vitals using the “checkout sheet” and keep with
equipment. (See page #83.)
24 |
EC Series Heat Pumps — 8733841499 (2024/05)
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