Typical Unit Parts Arrangement; Operating Gauge Set And Service Valves - Haier GE Appliances NS18AT Service Manual

Typical Unit Parts Arrangement

Operating Gauge Set and Service Valves

TORQUE REQUIREMENTS
When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. Table 1 provides
torque values for fasteners.
IMPORTANT
Only use Allen wrenches of sufficient hardness (50Rc
- 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
or breaking off the wrench, or stripping the valve stem
recess.
See the GE Appliances Service and Application Notes
#C-08-1 for further details and information.
IMPORTANT
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and fitted
snugly over the cap before tightening.
FIGURE 1. Typical Plumbing Arrangement
Parts
Service valve cap
Sheet metal screws
Machine screws #10
Compressor bolts
Gauge port seal cap
USING MANIFOLD GAUGE SET
When checking the system charge, only use a manifold
gauge set that features low loss anti-blow back fittings.
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 pres-
sures 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 remov-
ing refrigerant, flushing, leak testing, evacuating, checking
charge and charging. Each valve is equipped with a service
port which has a factory-installed valve stem. Figure 2 pro-
vides information on how to access and operating both an-
gle and ball service valves
Page 6
TABLE 1. Torque Requirements
Recommended Torque
8 ft.- lb.
16 ft.- lb.
28 ft.- lb.
90 in.- lb.
8 ft.- lb.
11 NM
2 NM
3 NM
10 NM
11 NM
31-5000747 Rev. 0