Payne PA13NR018 Installation Instructions Manual page 6

NOTE: These are not back-seating valves. It is not necessary to
force the stem tightly against the rolled lip.
The service valve cap is a primary seal for the valve and must be
properly tightened to prevent leaks. Make sure cap is clean and
apply refrigerant oil to threads and sealing surface on inside of cap.
Tighten cap finger tight and then tighten additional 1/6 of a turn (1
wrench flat) to properly seat the sealing surfaces.
I NOTE: Using the service ports (or gauge set), release the I
nitrogen pressure from the system before attaching vacuum
pump.
I. EVACUATING CONDENSER, LINE SET, AND
INDOOR COIL
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product damage.
Never use the outdoor unit compressor as a vacuum pump.
Doing so may damage the compressor.
Condenser, line set, and indoor coil should be evacuated using the
recommended deep vacuum method of 500 microns. If deep
vacuum equipment is not available, the alternate triple evacuation
method may be used by following the specified procedure.
If vacuum must be interrupted during the evacuation procedure,
always break vacuum with dry nitrogen.
UNIT OPERATION HAZARD
Failure to follow this caution may result in improper unit
operation..
This unit is filled with a Nitrogen charge. Prior to starting
this unit, evacuate to 500 microns and charge with
refrigerant listed on rating label. Purge nitrogen before
connection to vacuum pump.
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of
pulling a vacuum to 500 microns and a vacuum gauge capable of
accurately measuring this vacuum level. The deep vacuum method
is the most positive way of assuring a system is free of air and
water.
Watch the vacuum gauge as the system is pulling down. The
response of the gauge is an indicator of the condition of the system
(refer to Fig. 7).
With no leaks in the system, allow the vacuum pump to run for 30
minutes minimum at the deep vacuum level.
5000
4500
4000
3500
g3000
_2500
m
2000
1500- VACUUM TIGHT
TOO WET
1000
500 TIGHT
DRY SYSTEM
0 1 2 3 4 5 6 7
MINUTES
Fig. 7 - Deep Vacuum Gauge Response
and System Conditions
A95424
Triple Evacuation Method
The triple evacuation method should only be used when system
does not contain any water in liquid form and vacuum pump is
only capable of pulling down to 28 inches of mercury (711 mm
Hg). Refer to Fig. 8 and proceed is as follows:
1. Pull system down to 28 inches of mercury (711 mm Hg)
and allow pump to continue operating for an additional 15
minutes.
2. Close manifold valves or valve at vacuum pump and shut
off vacuum pump.
3. Connect a nitrogen cylinder and regulator to system and fill
with nitrogen until system pressure is 2 psig.
4. Close nitrogen valve and allow system to stand for 1 hour.
During this time, dry nitrogen will diffuse throughout the
system absorbing moisture.
5. Repeat this procedure as indicated in Fig. 8.
6. After the final evacuate sequence, confirm there are no leaks
in the system. If a leak is found, repeat the entire process
after repair is made.
IEVAOUATE I
IBREAKVACUUM
W ITH DRY NITROGEN
I
r- Tq
IEVACUATE I
IBREAK VACUUM WITHDRYNITROGEN
I
IEVACUATE I
ICHECK FOR TIGHT' DRY SYSTEM I
(IF IT HOLDS DEEP VACUUM)
I CHARGESYSTEM I
Fig. 8 - Triple Evacuation Sequence
A95425
J. GAUGE PORTS
Check for leaks at the schrader ports and tighten valve cores if
necessary. Install plastic caps finger tight.