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WATER PIPING

Supply and return piping must be as large as the unit connections
on the heat pump (larger on long runs).

CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in improper

equipment operation.
Never use flexible hoses of a smaller inside diameter than

that of the fluid connections on the unit.

GZ units are supplied with either a copper or optional cupronickel
water coax coil. Copper is adequate for ground water that is not

high in mineral content.

NOTE

: Proper testing is recommended to assure the well water

quality is suitable for use with water source equipment. When in
doubt, use cupronickel. See Application Considerations notes on
page 4.
In conditions anticipating moderate scale formation or in brackish

water, a cupronickel heat exchanger is recommended.
Both the supply and discharge water lines will sweat if subjected to

low water temperature. These lines should be insulated to prevent
damage from condensation. All manual flow valves used in the

system must be ball valves. Globe and gate valves must not be

used due to high pressure drop and poor throttling characteristics.

CAUTION

EQUIPMENT

DAMAGE

AND/OR

UNIT

OPERATION HAZARD

Failure to follow this caution may result in equipment

damage and/or improper operation.
Never exceed the recommended water flow rates as serious

damage or erosion of the water--to--refrigerant heat

exchanger could occur.

Always check carefully for water leaks and repair appropriately.

Units are equipped with female pipe thread fittings.

NOTE

: Teflon tape sealer should be used when connecting water

piping connections to the units to insure against leaks and possible
heat exchanger fouling.

NOTE

: The unit is shipped with water connection O--rings. A 10

pack of O--rings (part #4026) can be ordered through Replacement
Components Division (RCD).

IMPORTANT: Do not over--tighten connections.

Flexible hoses should be used between the unit and the rigid
system to avoid possible vibration. Ball valves should be installed

in the supply and return lines for unit isolation and unit water flow
balancing (on open--loop systems).

Loop Pump Connections

Refer to the flow center installation manual for piping and wiring
instructions.
When using a flow center containing a variable speed pump, kit
#4129 is required.

Water Solenoid Valves

Open loop well water applications require a water solenoid valve.
The purpose of the valve is to allow water to flow through the

GHP only during operation.
For ground water/open loop installations, solenoid valves
MVBR3F and MVBR4F are recommended due to its fast

opening/slow closing timing feature (see Fig. 7). This valve will
open in approximately 5 seconds. Solenoid valves that are slow

opening are not recommended as water in the unit’s coax may
freeze during start--up of a heating call. A frozen coax is not

covered under warranty. MVBR3 and MVBR4F valves are also

slow closing to eliminate potential water hammer.
Information on the MVBR3F and MVBR4F valves is shown

below.

A150629

Fig. 7 -- Solenoid Valves

Table 7 – Water Solenoid Valves

Part Number