Bosch SM070 Specifications download pdf (Page 44)

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44 | System Checkout SM Series Heat Pump

SM Series Heat Pump6 720 220 406 (2013/9) Subject to change without prior notice

SYSTEM CHECKOUT

After completing the installation, and before

energizing the unit, the following system checks

should 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.

4. Verify that the low voltage wiring between the

thermostat and the unit is correct.

5. Verify that the water piping is complete and

correct.

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

provided.

9. Unit is serviceable. Be certain that all access

panels are secured in place.

Considerations:

• 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 of 18

volts secondary control voltage. 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 insure 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.

UNIT START-UP

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 5

degrees below the room temperature.

4. Verify the heat pump is operating in the cooling

mode.

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 (5)

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

mode.

11. Set the thermostat to maintain the desired

space temperature.

12. Check for vibrations, leaks, etc.

Ensure cabinet and Electrical Box are

properly grounded.

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Bosch SM070 Specifications Page 44

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