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Post-Installation System Checkout; Unit Start-Up; Initial Start-Up Of A Hrp System - Bosch Greensource SM024 Installation, Operation And Maintenance Manual

Greensource cdi series sm model water-to-air heat pumps
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Greensource CDi Series SM Model
After completing the installation and before
energizing the unit, the following system checks
MUST be made:
1. Verify that the supply voltage to the heat pump
is in accordance with the nameplate ratings.
2. Make sure that all electrical connections are
tight and secure.
3. Check the electrical fusing and wiring for the
correct size.
DANGER: Ensure the cabinet and electrical box
are properly grounded.
4. Verify that the low-voltage wiring between the
thermostat and the unit is correct.
5. Verify that the water piping is complete and
6. Check that the water flow is correct and adjust
if necessary.
7. Check the blower for free rotation and that it is
secured to the shaft.
8. Verify that vibration isolation has been
9. Confirm that all access panels are secured in
Always check incoming line-voltage power
supply and secondary control voltage for
adequacy. Transformer primaries are dual
tapped for 208 and 230 volts. Connect the
appropriate tap to ensure a minimum
secondary control voltage of 18 volts. 24 volts
is ideal for best operation.
Long-length thermostat and control wiring
leads may create voltage drop. Increase wire
gauge or up-size transformers may be required
to ensure minimum secondary voltage supply.
FHP recommends the following guidelines for
wiring between a thermostat and the unit: 18
GA up to 60 foot, 16 GA up to 100 ft and 14 GA
up to 140 ft.
Do not apply additional controlled devices to
the control circuit power supply without
consulting the factory. Doing so may void
equipment warranties.
Check with all code authorities on
requirements involving condensate disposal/
over flow protection criteria.
Greensource CDi Series SM Model


1. Set the thermostat to the highest setting.
2. Set the thermostat system switch to "COOL,"
and the fan switch to the "AUTO" position. The
reversing valve solenoid should energize. The
compressor and fan should not run.
3. Reduce the thermostat setting approximately
five degrees below the room temperature.
4. Verify the heat pump is operating in the cooling
5. Turn the thermostat system switch to the
"OFF" position. The unit should stop running
and the reversing valve should de-energize.
6. Leave the unit off for approximately five
minutes to allow for system equalization.
7. Turn the thermostat to the lowest setting.
8. Set the thermostat switch to "HEAT."
9. Increase the thermostat setting approximately
5 degrees above the room temperature.
10. Verify the heat pump is operating in the heating
11. Set the thermostat to maintain the desired
space temperature.
12. Check for vibrations, leaks, etc.

Initial Start-Up of a HRP System

NOTICE: Make sure all valves in the heat
recovery water piping system are open.
1. Turn on the heat pump. The HR pump should
not run if the compressor is not running.
2. Turn HR switch to the "ON" position. The pump
will operate if entering water temperature to
HR is below 120°F.
3. The temperature difference between the water
entering and leaving the heat recovery should
be 5° to 15°F.
4. Allow the unit to operate for 20 to 30 minutes
to ensure it is functioning properly. The pump
should shut off when the water temperature
entering the heat recovery reaches 120°F.
Subject to change without prior notice

Post-Installation System Checkout | 27

8733819578 (2019/02)

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