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U U n n i i t t S S t t a a r r t t u u p p
550
500
450
400
350
(5)
(
(
(
(
)
)
)
)
)
)
300
250
200
40
185
175
165
155
(4)
145
135
125
115
40
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
32
Figure 12. Pressure Curves for 4YCZ5060E
Cooling with Thermal Expansion Valve
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
2ND STAGE
(3)
3)
(1)
60
80
100
OUTDOOR TEMPERATURE (Degree F)
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
2ND STAGE
(3)
(1)
60
80
100
OUTDOOR TEMPERATURE (Degree F)
71, 67, 63 AND 59 DEG F.
550
500
(2)
450
400
350
300
250
200
40
120
71, 67, 63 AND 59 DEG F.
185
175
165
(2)
155
145
135
125
115
120
40
ACTUAL:
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
DISCHARGE PRESSURE SHOULD BE +/- 10 PSI OF CHART
1ST STAGE
60
80
100
1ST STAGE
60
80
100
DWG.NO
4YCZ5060E
18-EB41D1-1B-EN
120
120
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