Trane GEH, GEV manual Installation, The example incorporates the Hays, system design

Installation

Supply/Return Pipe Connections Connect the supply and return hoses to the water-inlet (from supply) and water-outlet (to return)

of the unit. For vibration isola- tion, it is rec- ommended that flexible steel braided hoses be in- stalled instead of hard piping the equipment to the main loop system. Figure 7 shows connection of a Hays Measurf- lo balancing hose kit to the water-in and water-out of a vertical unit.

Types of Hose Connections Whether installing the units in a central pump (main/auxiliary pump for the en- tire zone) design, or as a distributed pump (1-pump per unit) design, a shut- off device and flexible hose is recom- mended to transition from the hard pip- ing of the closed or open loop water system to the unit. There are multiple hose combinations which may be used to fit the design or specification criteria for the installation.

(1)A steel braided hose without a shut- off device is the least expensive means of connecting the heat pump to the sup- ply/return water loop.

(2)With the addition of a shut-off device on the supply and return of the system, the unit may be isolated during service or maintenance situation. This system may be installed as a wide open (full wa- ter flow to the equipment) design, or manually balanced by utilizing the pres- sure/temperature ports on the top of the ball valve/shut-off device.

Note:

The Figure 7 example incorporates the Hays

Measurflo balancing hose kit and a 2-posi- tion isolation valve into the system design. An isolation valve is often used in variable speed pumping applications. The isolation valve is designed to stop water flow to the unit during non operation times. This al- lows the loop water pumps to run only when a requirement for pumping is needed for greater energy efficiency of the overall

system design.

Figure 7: Supply/Return pipe connections

Option 1: Flexible hoses

Option 2: Flexible hoses with ball valves

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