Envision Peripherals Geothermal Indoor Split Heat Pumps Open Loop Well Water Systems

ENVISION SERIES INSTALLATION MANUAL

Open Loop - Well Water Systems

Typical open loop piping is shown below. Always maintain water pressure in the heat exchanger by placing water con- trol valves at the outlet of the unit to prevent mineral precipitation. Use a closed bladder type expansion tank to minimize mineral formation due to air exposure. Ensure proper water flow through the unit by checking pressure drop across the heat exchanger and comparing it to the figures in the unit capacity data tables in the specification catalog. Usually 1.5-2 GPM of flow per ton of cooling capacity is recommended in open loop applications. In dual capacity units, stage 1 is 70% of the total tonnage. Therefore, due to only minor differences in flow rate from low to high, only one solenoid valve should be used. The valve should be sized for full flow.

Discharge water from the unit is not contaminated in any manner and can be disposed of in various ways depending

on local building codes (i.e.

recharge well, storm sewer,	Figure 4: Typical Split System Application Open Loop - Well Water
drain field, adjacent stream or
pond, etc.). Most local codes
forbid the use of sanitary sewer		Thermostat Wire
for disposal. Consult your local		From Air Handler		Rubber Bladder
				Pressure Tank
building and zoning depart-
			Disconnect	Lineset
ments to ensure compliance in				To Air Handler
your area.				Water Solenoid
				Control Valve

Notes: For open loop/ground- water systems or sytems that

Boiler Drains for System Flushing

Flow

do not contain an antifreeze solution, set SW2-Switch #2 to the “WELL” position (Refer to the table on page 21.) Slow opening/closing solenoid valves (type VM) are recommended to eliminate water hammer.

Regulator

Water Out

Water In

From W ell

Shut-Off Valves

P/T Plugs

Vibration Absorbing Pad or Air Pad

Figure 5: Open Loop Solenoid Valve Connection Option

Typical quick operating external 24V water solenoid valve (type PPV100 or BPV100) wiring.

Figure 9b: Open Loop Solenoid Valve Connection Option

Typical slow operating external 24V water solenoid valve (type VM) wiring.

SV

Solenoid

Valve

C

R

Acc Com

Acc NC

Acc NO

P1

1

2 P3

3

		Violet(2)	CC
	VM valve
	CC	Blk(1)	CC-GND
Comfort	Violet(3)
	Y1
Alert	Y2	Wht(4)	CCHI
			Logic Board

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