7
1. Break vacuum by fully opening liquid and suction base
valves.
2. Set thermostat to call for cooling. Check indoor and out-
door fan operation and allow system to stabilize for 10
minutes for fixed orifices and 20 minutes for expansion
valves.
Charge Verification
REFRIGERANT UNDER PRESSURE!
•
Do not overcharge system with refrigerant.
•
Do not operate unit in a vacuum or at negative pres-
sure.
Failure to follow proper procedures may cause
property damage, personal injury or death.
WARNING
Use refrigerant certified
standards. Used refrigerant
may cause compressor damage. Most portable machines
cannot clean used refrigerant to meet
tandards.
to AHRI
AHRI s
CAUTION
NOTICE
Violation of EPA regulations may result in fines or other
penalties.
Damage to the unit caused by operating the compressor with the
suction valve closed is not covered under the warranty and may
cause serious compressor damage.
CAUTION
Final Charge Adjustment
The outdoor temperature must be 60
°
F or higher. Set the room
thermostat to COOL, fan switch to AUTO, and set the tem-
perature control well below room temperature.
Purge gauge lines. Connect service gauge manifold to base-
valve service ports. Run the system (on low stage for two-
stage units) for 10 minutes to allow pressures to stabilize,
then check subcooling and/or superheat as detailed in the fol-
lowing sections.
Superheat = Suct. Line Temp. - Sat. Suct. Temp.
Subcooling = Sat. Liquid Temp. - Liquid Line Temp.
CAUTION
To prevent personal injury, carefully connect and disconnect
manifold gauge hoses. Escaping liquid refrigerant can cause
burns. Do not vent refrigerant into the atmosphere. Recover
all refrigerant during system repair and before final unit
disposal.
SUPERHEAT FORMULA = SUCT. LINE TEMP. - SAT. SUCT. TEMP.
55
57
59
61
63
65
67
69
71
10
13
17
20
23
26
29
30
31
8
11
14
16
19
22
26
27
29
5
8
10
13
15
19
23
24
25
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6
9
11
15
20
21
23
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7
12
17
18
20
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8
13
15
16
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7
10
11
13
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7
8
10
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7
8
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7
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SYSTEM SUPERHEAT (+/- 1°F)
Indoor Wet Bulb Temperature, °F
Outdoor Dry Bulb
Temperature, °F
60
65
70
105
110
115
75
80
85
90
95
100