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CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves
and protective clothing.
General Information
These instructions are intended as a general guide and do
not supersede national or local codes in any way. Consult
authorities having jurisdiction before installation.
with all-aluminum coil, designed for use with HFC-410A
refrigerant only.
The NS23A24M, 36M and 48M feature a variable capacity
rotary compressor. The NS23A60M model features a
variable capacity scroll compressor.
This unit must be installed with an approved indoor air
expanded ratings, visit www.AHRIdirectory.org. These
instructions are intended as a general guide and do not
supersede local codes in any way. Consult authorities
having jurisdiction before installation.
This outdoor unit is designed for use in systems that use a
Thermal expansion valve (TXV).
NOTE: Special procedures are required for cleaning the
all-aluminum coil in this unit.
WARNING
Electric shock hazard.
Can cause injury or death. Before attempting
to perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
Operating Gauge Set and Service Valves
Torque Requirements
When servicing or repairing heating, ventilating, and
air conditioning components, ensure the fasteners are
appropriately tightened. Table 1 lists torque values for
fasteners.
31-5000746 Rev. 0
- Rockwell Harness Scale minimum). Fully insert the
wrench into the valve stem recess.
Service valve stems are factory-torqued (from 9 ft-lbs
for small valves, to 25 ft-lbs for large valves) to prevent
refrigerant loss during shipping and handling. Using an
Allen wrench rated at less than 50Rc risks rounding
recess.
To prevent stripping of the various caps used, the
snugly over the cap before tightening.
Parts
Service valve cap
Sheet metal screws
Machine screws #10
Compressor bolts
Gauge port seal cap
Table 1. Torque Requirements
Using Manifold Gauge Set
When checking the system charge, only use a manifold
Manifold gauge set used with HFC-410A refrigerant
systems must be capable of handling the higher system
operating pressures. The gauges should be rated for use
with pressures of 0 - 800 psig on the high side and a low
side of 30" vacuum to 250 psig with dampened speed to
500 psi. Gauge hoses must be rated for use at up to 800
psig of pressure with a 4000 psig burst rating.
Operating Service Valves
The liquid and vapor line service valves are used for
checking charge and charging. Each valve is equipped
with a service port which has a factory-installed valve stem.
Figure 4 through Figure 6 provide information on access
and operation of both angle and ball service valves.
Page 9
IMPORTANT
IMPORTANT
Recommended Torque
8 ft.-lb.
11 NM
16 in.-lb.
2 NM
28 in.-lb.
3 NM
90 in.-lb.
10 NM
8 ft.-lb.
11 NM
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