Trane 4YCZ5048E1115A - Page 32

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18-EB41D1-1B-EN
Figure 12. Pressure Curves for 4YCZ5060E
200
250
300
350
400
450
500
550
40 60 80 100 120
115
125
135
145
155
165
175
185
40 60 80 100 120
115
125
135
145
155
165
175
185
40 60 80 100 120
200
250
300
350
400
450
500
550
40 60 80 100 120
OUTDOOR TEMPERATURE (Degree F)
DISCHARGE PRESSURE (PSIG)
SUCTION PRESSURE (PSIG)
OUTDOOR TEMPERATURE (Degree F)
2ND STAGE
2ND STAGE
1ST STAGE
1ST STAGE
(1)
(1)
(3)
(3)
(4)
(5)
(2)
(2)
3
)
(
(
(
(
)
)
)
)
)
)
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, LIQUID 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 LIQUID (4) OR SUCTION (5) PRESSURE IN LEFT COLUMN .
EXAMPLE: FIRST STAGE
(1) OUTDOOR TEMP. 82 F.
(2) INDOOR WET BULB 67 F.
(3) AT INTERSECTION
(4) SUCTION PRESSURE @ 800 CFM IS 339 PSIG
(5) DISCHARGE PRESSURE @ 800 CFM IS 141 PSI
ACTUAL:
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
DISCHARGE PRESSURE SHOULD BE +/- 10 PSI OF CHART
DWG.NO 4YCZ5060E
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
Cooling with Thermal Expansion Valve
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
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