Envision Peripherals R-410A Open Loop Ground Water Systems, SV Solenoid Valve, 1 2P3

ENVISION RESIDENTIAL INSTALLATION MANUAL

Open Loop Ground Water Systems

Typical open loop piping is shown below. Always maintain water pressure in the heat exchanger by placing water control 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. Insure proper water flow through the unit by checking pressure drop across the heat exchanger and comparing it to the figures in unit capacity data tables in the specification catalog. 1.5-2 GPM of flow per ton of cooling capacity is recommended in open loop applications. 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 codes, i.e. recharge well, storm sewer, drain field, adjacent stream or pond, etc. Most local codes forbid the use of sanitary sewer for disposal. Consult your local building and zoning departments to assure compliance in your area.

Note: For open loop/groundwater systems or systems that do not contain an antifreeze solution, set SW2-Switch #2 to the “WELL” position. (Refer to the table on page 28.) Slow opening/closing solenoid valves (type VM) are recommended to eliminate water hammer.

Figure 9a: 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.

C

R

P1

Violet(2) CC

VM valve

SV

Solenoid

Valve

Acc Com

Acc NC

Acc NO

1

2 P3

3

Comfort Y1 Alert Y2

CC Blk(1) CC-GND

Violet(3)

Wht(4)CCHI

Logic Board

Note: SW2-3 should be in the Comp “ON” position.

Figure 10: Open System - Groundwater Application

Unit Supply
Aux. Heat Supply
Flexible
Duct Collar
	Rubber Bladder
	Expansion Tank
Auxiliary
Heater	Flow Control
Knockout
	Valve
Desuperheater	(on outlet of
	Solenoid Valve)
Connections	Solenoid
	Valve
	Water Out
Drain	Water In
	Shut Off Valves
Disconnects	Shut Off Valves
(IfApplicable)	(to isolate solenoid
	valve while acid flushing)

Compressor	Low Voltage	P/T Plugs
Line Voltage	to Thermostat	Vibration
	and Valve
		Absorbing Pad

Strainer

Boiler Drains

For HX Flushing

10