18-EB41D1-1A-EN
31
Figure 11.
Pressure Curves for 4YCZ5048E
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)
D
IS
C
H
A
R
G
E
P
R
E
S
S
U
R
E
(P
S
IG
)
S
U
C
T
IO
N
P
R
E
S
S
U
R
E
(P
S
IG
)
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) LIQUID PRESSURE @ 800 CFM IS 336 PSIG
(5) SUCTION PRESSURE @ 800 CFM IS 151 PSIG
ACTUAL:
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
DWG.NO.
4YCZ5048E
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.
