UNIT DAMAGE H AZARD
Failure t o follow
this caution
may
result
in equipment
damage
or improper
operation.
Never use the system
compressor
as a vacuum
pump.
Refrigerant
tubes
and indoor
coil should
be evacuated
using
the
recommended
deep vacuum
method
of 500 microns.
The alternate
triple evacuation
method
may be used
if the procedure
outlined
below is followed.
Always
break a vacuum
with dry nitrogen.
SYSTEM VACUUM AND CHARGE
Using Vacuum
Pump
1. Completely
tighten
flare nuts A, B, C, D, connect
manifold
gage charge
hose to a charge
port of the low side service
valve.
(See Fig. 16.)
2. Connect
charge hose to vacuum
pump.
3. Fully open the low side of manifold
gage. (See Fig. 17)
4. Start vacuum
pump
5. Evacuate
using
either
deep
vacuum
or triple
evacuation
method.
6. After
evacuation
is complete,
fully
close
the low
side of
manifold
gage and stop operation
of vacuum
pump.
7. The factory
charge contained
in the outdoor
unit is good for
up to 25 ft. (8 m) of line length.
For refrigerant
lines longer
than 25 ft (8 m), add 0.1 oz. per foot of extra piping
up to
the maximum
allowable
length.
8. Disconnect
charge hose from charge
connection
of the low
side service valve.
9. Fully open service valves B and A.
10. Securely
tighten
caps of service valves.
Outdoor Unit
Refrigerant
Indoor Unit
I_
_T_&
LowSide
D_
2:_ B
High Side
Service Valve
A07360
Fig. 16 -
Service
Valve
Lo:002CvT:
Charge hose
Manifold Gage
High side valve
harge hose
_- Vacuum pump
Low side valve
Fig. 17 - Manifold
A07361
Deep Vacuum
Method
The
deep
vacuum
method
requires
a vacuum
pump
capable
of
pulling
a vacuum
of 500 microns
and a vacuum gage
capable of
accurately measuring
this vacuum depth. The deep vacuum method
is the most
liquid
water.
o)
Z
O
iv.
O
m
=;
)ositive
way of assuring
a system
is free of air and
See Fig. 18)
LEAK IN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
0
1
2
3
4
5
6
7
MINUTES
Fig. 18 - Deep Vacuum
Graph
A95424
Triple Evacuation Method
The triple evacuation method should only be used when vacuum
pump is only capable of pumping
down to 28 in, of mercury
vacuum and system does not contain any liquid water.
Refer to Fig, 19 and proceed as follows:
1. Pump system down to 28 in. of mercury and allow pump to
continue operating for an additional 15 minutes.
2. Close service valves and shut off vacuum pump.
3. Connect a nitrogen cylinder and regulator to system and
open until system pressure is 2 psig.
4. Close service valve and allow system to stand for 1 hr. Dur-
ing this time, dry nitrogen will be aMe to diffuse throughout
the system absorbing moisture.
5. Repeat this procedure as indicated in Fig. 19. System will
then be free of any contaminants and water vapor.
IEVACUATE
I
l BREAK VACUUM WITH DRY NITROGEN I
IEVACUATE
I
IBREAK VACUUM
WITH DRY NITROGE" I
IEVACUATE
I
I CHECK FOR TIGHT, DRY SYSTEM
I
(IF IT HOLDS DEEP VACUUM)
I RELEASE CHARGE INTO SYSTEM I
A95425
Fig. 19 -
Triple
Evacuation
Method
Final
Tubing
Check
IMPORTANT:
Check to be certain factory
tubing on both indoor
and outdoor
unit has not shifted
during
shipment.
Ensure
tubes are
not
rubbing
against
each
other
or any sheet
metal.
Pay
close
attention
to feeder tubes,
making
sure wire ties on feeder
tubes are
secure and tight.
11
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