Table of Contents
Advertisement
Cooling with Thermal Expansion Valve
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
550
2ND STAGE
500
450
400
350
300
250
200
40
60
80
100
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
185
175
2ND STAGE
165
155
145
135
125
115
40
60
80
100
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).
EXAMPLE: (1) OUTDOOR TEMP. 82 F.
(2) INDOOR WET BULB 67 F.
(3) AT INTERSECTIO
(4) DISCHARGE PRESSURE @ 1200 CFM IS 294 PSIG.
(5) SUCTION PRESSURE @ 1550 CFM IS 147 PSIG.
18-BB35D1-16B-EN
Figure 10. 4WCZ6048
Cooling
71, 67, 63 AND 59 DEG F.
550
1ST STAGE
500
450
400
350
(4)
(3)
300
250
(1)
200
120
40
60
80
OUTDOOR TEMPERATURE (Degree F)
185
71, 67, 63 AND 59 DEG F.
175
1ST STAGE
165
155
(3)
(5)
145
135
125
(1)
115
120
40
60
80
OUTDOOR TEMPERATURE (Degree F)
N
Heating with Thermal Expansion Valve
INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM
500
2ND STAGE
450
(2)
400
350
300
250
200
100
120
-5 5 15 25 35 45 55 65
INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM
160
150
2ND STAGE
140
130
(2)
120
110
100
90
80
70
60
50
40
100
120
-5 5 15 25 35 45 55 65
A
CTUAL:
DISCHARGE PRESSURE SHOULD BE +/- 10 PSI OF CHART
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
U U n n i i t t S S t t a a r r t t u u p p
Heating
80, 70, AND 60 DEG F.
500
1ST STAGE
450
400
350
300
250
200
-5
5 15 25 35 45 55 65
160
80, 70, AND 60 DEG F.
150
1ST STAGE
140
130
120
110
100
90
80
70
60
50
40
-5
5 15 25 35 45 55 65
DWG.NO. 4WCZ6048B
25
Advertisement
Table of Contents
