Envision NSZ Installation Manual download pdf (Page 10)

NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL

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. 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.

Figure 4: Typical Split System Application Open Loop - Well Water

Disconnect

Thermostat Wire

From Air Handler

Vibration Absorbing Pad or Air Pad

P/T Plugs

Boiler Drains for

System Flushing

Water Solenoid

Control Valve

Rubber Bladder

Pressure Tank

Lineset

T o Air Handler

Flow

Regulator

Shut-Off Valves

Water Out

Water In

From W ell

Acc Com

Acc NC

Acc NO

Solenoid

Valve

CC-GND

CCHI

Comfort

Alert

Logic Board

Violet(3)

Blk(1)

Wht(4)

VM valve

Violet(2)

Figure 9b: Open Loop Solenoid Valve Connection Option

Typical slow operating external 24V water solenoid valve

(type VM) wiring.

Figure 5: Open Loop Solenoid Valve Connection Option

Typical quick operating external 24V water solenoid valve

(type PPV100 or BPV100) wiring.

Open Loop - Well Water Systems

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,

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 ensure

compliance in your area.

NOTES: 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 DIP Switch

Settings table.) Slow opening/closing solenoid valves (type

VM) are recommended to eliminate water hammer.

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Envision NSZ Installation Manual Page 10

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