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Page Title:
CHARGING THE REFRIGERANT SYSTEM.-Continued |
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 TM5-4120-384-14
5 - 1 6 . CHARGING THE REFRIGERANT SYSTEM.-Continued
Close low pressure (suction) charging manifold valve.
Never
g.
introduce liquid refrigerant into low pressure (suction) charging
valve.
h.
Position Refrigerant-22 tank so that liquid will be used for
(Some drums must be inverted and some are equipped with
charging.
a selector valve.)
i.
Use accurate
scales
to
measure
and
record
weight
of
Refrigerant-22 drum.
Open
Refrigerant-22
drum
valve.
j.
k.
Open high pressure charging valve on air conditioner.
Allow
liquid refrigerant to enter system until drum weight has decreased
by 3.6 pounds (1.63 Kg) for units with Carrier compressors and 2.8
pounds (1.27 Kg) for units with Keco compressors or until system
pressure has equalized.
l.
Close refrigerant
drum
valve
and
high
pressure
(discharge)
manifold valve.
Reset
low
pressure
cut
out
switch.
m.
n.
Connect power at power source.
o.
Turn air conditioner on and operate in cool mode
with
TEMPERATURE SELECTOR set at maximum COOLER position.
If 3.6 pounds (1.63 Kg) for units with Carrier compressors
p.
and 2.8 pounds (1.27 Kg) for units with Keco compressors full
charge was obtained, skip steps q. through s.
If system pressure
equalized prior to obtaining a full charge of 3.6 pounds (1.63 Kg)
for units with Carrier compressors and 2.8 pounds (1.27 Kg) for
units with Keco compressors proceed with step q.
only position.
Switch
refrigerant
drum
to gas
q.
Be sure refrigerant drum has been switched to g a s position
r.
and open refrigerant drum valve, low (suction) pressure charging
manifold valve and low (suction) pressure charging valve on air
conditioner.
Monitor weight of the refrigerant drum as air conditioner
s.
compressor pulls additional refrigerant gas into system until full
3.6 pounds (1.63 Kg) for units with Carrier compressors and 2.8
pounds (1.27 Kg) for units with Keco compressors charge is ob-
When system is fully charged, immediately close refriger-
tained.
ant drum valve and air conditioner low pressure charging valve.
t.
Run air conditioner in COOL mode (with temperature control
in coolest position) for 15 minutes.
5-36
Change 2
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