9
NSZ/NDZ 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)
Airflow(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
