Manual 2100-250
Page 13
OPEN LOOP (Well System Applications)
NOTE: Low temperature thermostat factory set to 25º for open loop applications.
It is very important that an adequate supply of clean, noncorrosive water at the proper pressure be provided
before the installation is made. Insufficient water, in the heating mode for example, will cause the low
temperature control to trip, shutting down the heat pump. In assessing the capacity of the water system, it is
advisable that the complete water system be evaluated to prevent possible lack of water or water pressure at
various household fixtures whenever the heat pump turns on. All plumbing to and from the unit is to be
installed in accordance with local plumbing codes. The use of plastic pipe, where permissible, is
recommended to prevent electrolytic corrosion of the water pipe. Because of the relatively cold temperatures
encountered with well water, it is strongly recommended that the water lines connecting the unit be insulated to
prevent water droplets from condensing on the pipe surface.
Refer to piping, Figure 14. Slow closing Solenoid Valve (6) with a 24V coil provides on/off control of the water
flow to the unit. Refer to the wiring diagram for correct hookup of the valve solenoid coil.
Constant Flow Valve (7) provides correct flow of water to the unit regardless of variations in water pressure.
Observe the water flow direction indicated by the arrow on the side of the valve body. Following is a table
showing which valve is to be installed with which heat pump.
Strainer (5) installed upstream of constant flow valve (7) to collect foreign material which would clog the flow
valve orifice.
Figure 14 shows the use of shut-off valves (9) and (11), on the in and out water lines to permit isolation of the
unit from the plumbing system should future service work require this. Globe valves should not be used as
shut-off valves because of the excessive pressure drop inherent in the valve design. Instead use gate or ball
valves as shut-offs so as to minimize pressure drop.
Drain cocks (8) and (10) and tees have been included to permit acid cleaning the refrigerant-to-water coil
should such cleaning be required. See WATER CORROSION.
Drain cock (12) provides access to the system to check water flow through the constant flow valve to insure
adequate water flow through the unit. A water meter 1-10 GPM (8603-013) is used to check the water flow
rate.
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The pressure drop through the constant flow valve will vary
depending on the available pressure ahead of the valve.
Unless a minimum of 15 PSIG is available immediately
ahead of the valve, no water will flow.
TABLE 5
CONSTANT FLOW VALVES
Содержание WPV48D
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Страница 23: ...Manual 2100 250 Page 21 FIGURE 19 WATER SOURCE HEAT PUMP COOLING CYCLE MIS 1229...
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