Bosch TW Series Specifications download pdf (Page 5)

6 720 220 047

Revised 03-11 Subject to change without prior notice

TW Series / Water to Water

where water released during start-up or

maintenance could cause damage below the unit.

MINIMAL SYSTEM VOLUME

Bosch recommends that the total uid volume in the

system be not less than 6 gallons per nominal ton of

cooling capacity on both the load and source sides.

ELECTRICAL

Caution

Always disconnect power to the unit before

servicing to prevent injury or death due to

electrical shock.

All eld wiring must comply with local and national

re, safety and electrical codes. Power to the unit

must be within the operating voltage range

indicated on the unit’s nameplate. On three phase

units, phases must be balanced within 2%.

Properly sized fuse or HACR circuit breakers must

be installed for branch circuit protection. See

equipment rating plate for maximum size. The unit

is supplied with an opening for attaching conduit.

Be certain to connect the ground lead to the

ground lug in the control box. Connect the power

leads as indicated on the unit wiring diagram

(Refer to Figure #6).

PIPING

Supply and return piping must be as large as the

unit connections on the heat pump (larger on long

runs). Never use exible hoses of a smaller inside

diameter than that of the water connections on

the unit. The Water-to-Water series units are

supplied with either a copper or optional cupro-

nickel condenser. Should your well driller express

concern regarding the quality of the well water

available or should any known hazards exist in

your area, we recommend proper testing to assure

the well water quality is suitable for use with

water source equipment. In conditions

anticipating moderate scale formation or in

brackish water a cupro-nickel heat exchanger is

recommended.

Galvanized pipe or ttings are not recommended

for use with these units due to the possible

galvanic corrosion.

Both the supply and discharge water lines will

sweat if subject to low water temperature. These

lines should be insulated to prevent damage from

condensation.

All manual ow valves used in the system must be

ball valves. Globe and gate valves must not be

Minimal System Volume

COOLING TOWER/BOILER APPLICATION

(SOURCE SIDE)

1. BALL VALVES

2. HOSE KITS

3. P/T PLUGS

4. LOAD SIDE CONNECTIONS*

5. LOW VOLTAGE CONTROL CONNECTION*

6. VIBRATION PAD

7. LINE VOLTAGE DISCONNECT

8. SUPPLY AND RETURN LINES OF

CENTRAL SYSTEM

Figure #1

* NOTE: Water and electrical connection locations vary depending on model. Connect as required per unit labels.

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Bosch TW Series Specifications Page 5

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