Bosch TW Series Specifications download pdf (Page 7)

6 720 220 047

Revised 03-11 Subject to change without prior notice

TW Series / Water to Water

water side pressure drop. See specication sheets

for water ow and pressure drop information.

WELL WATER SYSTEMS (Figure #2)

Water quantity should be plentiful, between 1.5

and 3.0 gpm per ton of cooling, and of good quality.

To avoid the possibility of freezing in the heating

mode, the well water should be above 50˚F.

Water pressure must always be maintained in the

heat exchanger by placing a water control valve on

the outlet of the water-to-water unit. A bladder type

expansion tank may be used to maintain pressure

on the system. All solenoid valves should be slow

closing to avoid water hammer.

The discharge water from the water-to-water unit is

not contaminated in any manner and can be

disposed of in various ways depending on the local

codes (i.e. discharge well, dry well, storm sewer,

drain eld, stream, pond, etc.) Pilot operated or

slow closing valves are recommended to reduce

water hammering.

EARTH COUPLED GEOTHERMAL

SYSTEMS (Figure #3)

Closed loop and pond applications require

specialized design knowledge. No attempt at these

installations should be made unless the dealer has

received specialized training.

Utilizing the Ground Loop Pumping Package

(GLP), makes the installation easy. Anti-freeze

solutions are utilized when entering loop

temperatures drop below 50˚F or where piping

will be routed through areas subject to freezing. A

ow rate between 2.5 to 3.0 gpm per nominal ton

of cooling is recommended for this application.

See GLP Pump Curve for sizing information.

TYPICAL LOAD SIDE APPLICATIONS

There are many load side applications for which

the water-to-water heat pump/ liquid chiller is

ideally suited.

SOME TYPICAL USES ARE AS

FOLLOWS

Hydronic baseboard heating, hydronic in-slab oor

heating, forced air fan coil heating or cooling, ice

and snow melting, heating potable water, (when

allowed by code) heating swimming pool and spa*,

process uid heating or cooling.

When specifying load side uid volume it is

important to consider the heat pump output

capacities and ow rates. Insufcient load side

uid volume may cause unstable heat pump

operation (short cycling). Pressure/temperature

ports should be used to set ow rates.

Well Water Systems

EARTH COUPLED APPLICATION (SOURCE SIDE)

1. POLYBUTYLENE OR POLYETHELENE WITH

INSULATION

2. GROUND LOOP PUMPING PACKAGE (GLP)

3. GROUND LOOP CONNECTION KIT

4. P/T PLUGS

5. LOAD SIDE CONNECTIONS*

6. LOW VOLTAGE CONTROL CONNECTION*

7. VIBRATION PAD

8. LINE VOLTAGE DISCONNECT

Figure #3

* 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 7

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