Envision NSZ Installation Manual download pdf (Page 9)

NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL

Water Piping

The proper water flow must be provided to each unit

whenever the unit operates. To assure proper flow, use

pressure/temperature ports to determine the flow rate.

These ports should be located at the supply and return

water connections on the unit. The proper flow rate cannot

be accurately set without measuring the water pressure

drop through the refrigerant-to-water heat exchanger.

All source water connections on residential units are

swivel piping fittings (see Figure 3) that accept 1 in. male

pipe threads (MPT). The swivel connector has a rubber

gasket seal similar to a rubber hose gasket, which when

mated to the flush end of any 1 in. threaded pipe provides

a leak-free seal without the need for thread sealing tape

or compound. Check to ensure that the rubber seal is in

the swivel connector prior to attempting any connection.

The rubber seals are shipped attached to the waterline.

To make the connection to a ground loop system, mate

the brass connector (supplied in CK4L connector kit)

against the rubber gasket in the swivel connector and

thread the female locking ring onto the pipe threads, while

maintaining the brass connector in the desired direction.

Tighten the connectors by hand, then gently snug the

fitting with pliers to provide a leak-proof joint. When

connecting to an open loop (ground water) system, thread

the 1 in. MPT fitting (SCH80 PVC or copper) into the swivel

connector and tighten in the same manner as noted above.

The open and closed loop piping system should include

pressure/temperature taps for serviceability.

Locking

Ring

Stainless

Steel

Snap Ring

Gasket

Support

Sleeve

Gasket

Material

Figure 3: Swivel Connections

(Residential Units)

General Installation Information cont.

Never use flexible hoses smaller than 1 in. inside diameter

on the unit. Limit hose length to 10 ft. per connection.

Check carefully for water leaks.

Air Handler Sizing Selection

The Envision Air Handlers are designed for R410a refrigerant and should be matched with Envision Split series compressor

section according to the table below.

Air Handler

Indoor Split Model

(Single)

Indoor Split Model

(Dual Capacity)

Outdoor Split Model

(Dual Capacity)

Airow(CFM) Electric Heat (kW)

NAH022A***1R

NSZ022 - 800 5

NAH026A***1R

- NDZ026 NDS026 925 5

NAH030A***1R

NSZ030 - - 980 5, 10

NAH036A***1R

NSZ036 - - 1225 5, 10

NAH036A***1R

- NDZ038 NDS038 1225 5, 10

NAH042A***1R

NSZ042 - - 1425 10, 15

NAH048A***1R

NSZ048 - - 1625 10, 15

NAH048A***1R

- NDZ049 NDS049 1625 10, 15

NAH060A***1R

NSZ060 - - 1760 10, 15, 20

NAH060A***1R

- NDZ064 NDS064 1760 10, 15, 20

NAH060A***1R

NSZ070 - - 1760 10, 15, 20

NAH060A***1R

- NDZ072 NDS072 1760 10, 15, 20

6/9/08

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Envision NSZ Installation Manual Page 9

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