Envision NSZ Installation Manual download pdf (Page 13)

NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL

Figure 11: Hot Water Generator Installation

in Preheat Tank

Figure 10: Typical Hot Water Generator Installation

Drain V a lve

P/T Relief

V a lve

Cold

Wa ter In

Hot

Wa ter Out

DHW

Wa ter In

DHW

Wa ter Out

Venting Waste V a lve

or Vent Coupling

3/4˝ x 3/4˝ x 1/2˝ tee

Drain Valve Drain Valve

P/T Relief

Valve

Venting Waste Valve

or Vent Coupling

DHW

3/4˝ x 3/4˝ x 1/2˝ tee

Water In

Hot

Water Out

Cold

Water In

Water Out

P/T Relief

Valve

The heat reclaiming hot water generator coil is vented

double-wall copper construction and is suitable for potable

water. To maximize the benefits of the hot water generator

a minimum 50-gallon water heater is recommended. For

higher demand applications, use an 80-gallon water heater

or two 50-gallon water heaters connected in a series as

shown below. A geo storage tank should not be used in this

application unless it is plumbed in a series with an electric

water heater. The geo storage tank is equipped with a

single 4500 Watt element and will not be able to provide

adequate water heating if used as a standalone water

heater. Electric water heaters are recommended. Make sure

all local electrical and plumbing codes are followed when

installing a hot water generator. Residential units with hot

water generators contain an internal circulator and fittings. A

water softener is recommended for hard water applications

(greater than 10 grains or 170 ppm total hardness).

CAUTION: Elements will burn out if energized dry.

Water Tank Preparation

To install a unit with hot water generator, follow these

installation guidelines.

Turn off the power to the water heater.1.

Attach a water hose to the water tank drain connection 2.

and run the other end of the hose to an open drain or

outdoors.

Close the cold water inlet valve to the water heater 3.

tank.

Drain the tank by opening the valve on the bottom 4.

of the tank, then open the pressure relief valve or hot

water faucet.

Hot Water Generator Connections

NOTE: Under certain conditions, Envision dual capacity

units operate with very low refrigerant discharge

temperatures, producing little or no water heating

capability. This scenario occurs when the unit is operating

with cold entering source water (loop or well). Allowing

the hot water generator pump to operate during

these conditions actually removes heat from the DHW

circulating through the unit. To overcome this, Envision unit

microprocessors have been programmed to disengage the

hot water generator pump during such conditions. (During

low capacity cooling operation, the pump will operate only

if the DHW temperature entering the unit is less than the

liquid line temperature plus 35° F. During high capacity

cooling operation, the pump will operate only if the DHW

temperature is less than the liquid line temperature plus

60°F.) Using a preheat tank, as shown in Figure 11, will

maximize hot water generator capabilities.

Flush the tank by opening the cold water inlet valve to 5.

the water heater to free the tank of sediments. Close

when draining water is clear.

Disconnect the garden hose and remove the drain 6.

valve from the water heater.

Refer to Plumbing Installation and Hot Water Generator 7.

Startup.

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Envision NSZ Installation Manual Page 13

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