Water Tank Refill - Bosch TW Series Installation And Maintenance Manual

Water Tank Refill

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 flows 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 specific 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.
Revised 03-11 Subject to change without prior notice
TW Series / Water to Water
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.
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