Start-Up; Unit Start Up Cooling Mode; Unit Start Up Heating Mode; Commissioning - Bosch CL Series Installation, Operation And Maintenance Manual

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 15 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 compressor is ON and that the water flow rate
is correct by measuring pressure drop through the heat
exchanger using P/T plugs.
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
compressor is operating. Air temperature drop should be
between 15° and 25°F.

10.2 Unit Start Up Heating Mode

Operate the unit in heating cycle after checking the cooling
cycle. Allow five minutes between tests for the pressure or
reversing valve 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.
30 |
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. Air temperature rise should be between 20°F
and 30°F after 15 minutes load.
7. Check for vibration, noise, and water leaks.

11 Commissioning

Record all system vitals using the "checkout sheet" and keep with
equipment. (See page #98.)
CL Series Heat Pumps — 8733838716 (2024/05)