Bosch TW Series Specifications download pdf (Page 15)

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Revised 03-11 Subject to change without prior notice

TW Series / Water to Water

WATER TANK REFILL:

1. Open the cold water supply to the tank.

2. Open a hot water faucet to vent air from the system

until water ows from the faucet, then close.

3. Depress the hot water tank pressure relief valve

handle to ensure there is no air remaining in the tank.

4. Carefully inspect all plumbing for water leaks.

Correct as required.

5. Purge all air from HR by depressing the schrad-

er valve on the HR Unit. Allow all air to bleed out

until water appears at the valve.

6. Before restoring the power or fuel supply to the

water heater, adjust the temperature setting on

the tank thermostat(s) to ensure maximum

utilization of the heat available from the refrig-

eration system and conserve the most energy.

On tanks with both upper and lower elements

and thermostats, the lower element should be

turned down to 100° F, while the upper element

should be adjusted to 120° F. Depending upon

the specic needs of the customer, you may

need to adjust the upper element differently. On

tanks with a single thermostat lower the thermo-

stat setting to 120° F or the “LOW” position.

7. After thermostat adjustments are completed,

replace access cover and restore electrical or

fuel supply to water heater.

INITIAL START-UP:

1. Make sure all valves in heat recovery water

piping system are open. NEVER OPERATE HR

PUMP DRY.

2. Turn on the heat pump. The HR pump should

not run if the compressor is not running.

3. Turn HR switch to the “ON” position. The pump

will operate if entering water temperature to HR

is below 120° F.

4. The temperature difference between the water

entering and leaving the heat recovery should

be 5° to 15° F.

5. 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.

Water Tank Rell

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Bosch TW Series Specifications Page 15

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