Bosch TW Series Specifications download pdf (Page 13)

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Revised 03-11 Subject to change without prior notice

TW Series / Water to Water

reset to DE. The ND setting could be selected at

start-up to avoid prolonged waiting periods during

commissioning.

Once selected hit the “mode” key to advance.

Setting:______________________

Sixth display eld

Compressor setting, (Si) single or (Du) dual. Use

the up or down arrows to select. Hit the “mode” key

to advance. This is only applicable on multi stage

units. If set to Si on a dual circuit unit the second

stage will not come on. Must be set to “DU” for al

TW models.

Setting:______________________

Seventh display eld

Lead\lag setting (dual compressor only). Set point

is 0 to 14 days on lead compressor rotation se-

quence. Use up or down arrows to select. Hit

“mode” key to advance. Must be set to “0” for all

TW models.

Setting:______________________

Eighth display eld

Malfunction output setting, (Pu) pulsed or (St)

standard constant on. This sets the malfunction

output relay to mimic the fault blink code that is

causing the safety lock-out. This can be used for

remote monitoring and remote trouble shooting.

Use the up or down arrows to select. Hit the

“mode” key to advance.

Setting:______________________

The controller is now congured and is fully

operational.

A copy of this conguration sheet should be left

with the home owner or building manager for their

records of initial control settings.

SYSTEM CHECKOUT

After completing the installation, and before

energizing the unit, the following system checks

should be made:

• Verify that the supply voltage to the unit is in

accordance with the nameplate ratings.

• Make sure that all electrical connections are tight

and secure.

• Check that the eld wiring and the electrical

fusing are the correct size.

• Verify that the low voltage wiring between the

primary controller and the unit is correct.

• Verify that the water piping is complete and

correct.

• Check that the water ow is correct, adjust if

necessary.

• Verify that vibration isolation has been provided.

• Be certain that the unit is serviceable, and all

access panels are secured in place.

UNIT START-UP

1. Set the primary controller to the highest set-

ting.

2. Set the primary controller system switch to

“COOL”. The reversing valve solenoid should

energize. The compressor should not run.

Reduce the primary controller setting approxi-

mately 5 degrees below return uid temperature.

4. Verify the heat pump is operating in the cooling

mode.

5. Check the cooling refrigerant pressures against

the values listed in Table #1.

6. Turn the primary controller system switch to the

“OFF” position. The unit should stop running

and the reversing valve should de-energize.

7. Leave the unit off for approximately (5) minutes

to allow for system equalization.

8. Turn the primary controller to the lowest setting.

9. Set the primary controller switch to “HEAT”.

10. Increase the primary controller setting

approximately 5 degrees above the return uid

temperature.

11. Verify the heat pump is operating in the heating

mode.

12. Check the heating refrigerant pressures against

the values listed in Table #2.

13. Set the primary controller to maintain the

desired return uid temperature.

14. Check for vibrations, leaks, etc...

15. Instruct the owner on the unit and control

operation.

System Checkout

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Bosch TW Series Specifications Page 13

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