20
18-BC90D1-4A-EN
STEP 8
- Verify typical performance.
Refer to System Pressure Curves in the Service
Facts or on the label inside the control panel to
verify typical performance.
STEP 6
- Adjust refrigerant level to attain
proper gage pressure.
Add refrigerant if the Liquid Gage Pressure is
lower than the chart value.
1. Connect gages to refrigerant bottle
and unit as illustrated.
2. Purge all hoses.
3. Open bottle.
4. Stop adding refrigerant when liquid
line temperature and Liquid Gage
Pressure matches the charging chart
Final Subcooling value.
Recover refrigerant if the Liquid Gage Pres-
sure is higher than the chart value.
20 MIN.
STEP 7
- Stabilize the system.
1. Wait 20 minutes for the system condi-
tion to stabilize between adjustments.
Note:
When the Liquid Line Temperature and
Gage Pressure approximately match the chart,
the system is properly charged.
2. Remove gages.
3. Replace service port caps to prevent
leaks. Tighten finger tight plus an
additional 1/6 turn.
(Example only - see Service Facts)
PRESSURE CURVES FOR 4TWR3036B1000A
TAM4A0A36S31
TAM4A0A36S31
Cooling
Heating
DI
SCHARG
E
PRESSURE
(PSI
G
)
OUTDOOR TEMPERATURE (Degree F)
SUCTI
O
N
PRESSURE
(PSI
G
)
OUTDOOR TEMPERATURE (Degree F)
COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 65 DEG F.
TO CHECK COOLING PERFORMANCE, SELECT THE PROPER INDOOR CFM, ALLOW PRESSURES TO STABILIZE. MEASURE INDOOR WET BULB
TEMPERATURE, OUTDOOR TEMPERATURE, DISCHARGE AND SUCTION PRESSURES. ON THE PLOTS LOCATE OUTDOOR TEMPERATURE (1);
LOCATE INDOOR WET BULB (2); FIND INTERSECTION OF OD TEMP. & ID W.B. (3); READ DISCHARGE OR SUCTION PRESSURE IN LEFT
COLUMN (4) or (5).
EXAMPLE: (1) OUTDOOR TEMP. 82 F.
(2) INDOOR WET BULB 67 F.
(3) AT INTERSECTION
ACTUAL:
(4) DISCHARGE PRESSURE IS 315 PSIG
DISCHARGE PRESSURE SHOULD BE +/- 10 PSI OF CHART
(5) SUCTION PRESSURE IS 135 PSIG
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
INTERCONNECTING LINES
GAS - 3/4" O.D.
LIQUID - 3/8" O.D.
DWG.NO. 4TWR3036B1
(2)
(5)
(3)
(1)
110
115
120
125
130
135
140
145
150
155
160
55
65
75
85
95
105
115
(2)
(4)
(3)
(1)
200
250
300
350
400
450
500
55
65
75
85
95
105
115
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM 71,
67, 63 AND 59 DEG F.
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
40
50
60
70
80
90
100
110
120
130
140
150
160
-5
5
15
25
35
45
55
65
250
300
350
400
450
500
-5
5
15
25
35
45
55
65
INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM 80, 70, AND 60
DEG F.
INDOOR ENTERING DRY BULB CURVESTOP TO BOTTOM 80, 70, AND
60 DEG F.
