Trane 4TWX8 Installer's Manual page 20

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.
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 ad-
ditional 1/6 turn.
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.
20
20 MIN.
(Example only - see Service Facts)
PRESSURE CURVES FOR 4TWR3036B1000A
TAM4A0A36S31
Cooling
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM 71, INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM 80, 70, AND 60
67, 63 AND 59 DEG F. DEG F.
500
(2) 500
450
450
400
400
350
(4) (3)
350
300
300
250
(1)
200 250
55 65 75 85 95 105 115 -5 5
OUTDOOR TEMPERATURE (Degree F)
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM INDOOR ENTERING DRY BULB CURVESTOP TO BOTTOM 80, 70, AND
160 160
71, 67, 63 AND 59 DEG F. 60 DEG F.
150
155
140
150
(2)
130
145
120
140
110
(5) (3)
135 100
90
130
80
125
70
120
60
115
50
(1)
110 40
55 65 75 85 95 105 115 -5 5
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.
TAM4A0A36S31
Heating
15 25 35 45 55 65
15 25 35 45 55 65
DWG.NO. 4TWR3036B1
18-BC91D1-6B-EN