PRESSURE CURVES FOR 4TTA3030AD
MCDA30
Cooling with FCCV or Capillary Tubes
LI
Q
U
ID
PR
ESSU
R
E (
PSI
G
)
OUTDOOR TEMPERATURE (Degree F)
SU
C
TI
O
N
PR
ESSU
R
E (
PSI
G
)
OUTDOOR TEMPERATURE (Degree F)
COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 85 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: (1) OUTDOOR TEMP. 95 F.
(2) INDOOR WET BULB 63 F.
(3) AT INTERSECTION
ACTUAL:
(4) LIQUID PRESSURE @ 980 CFM IS 369 PSIG
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
(5) SUCTION PRESSURE @ 980 CFM IS 134 PSIG
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
INTERCONNECTING LINES
Suction - 3/4"
Liquid - 3/8"
DWG.NO.
4TTA3030AD
110
115
120
125
130
135
140
145
150
155
160
165
170
70
80
90
100
110
120
130
250
300
350
400
450
500
550
600
70
80
90
100
110
120
130
(1)
(1)
(3)
(3)
(5)
(4)
(2)
(2)
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
PRESSURE CURVES FOR 4TTA3042AD
MCDB42
Cooling with FCCV or Capillary Tubes
LIQ
U
ID
P
R
ESS
UR
E
(PS
IG
)
OUTDOOR TEMPERATURE (Degree F)
SUC
TIO
N
P
R
ESS
UR
E
(PS
IG
OUTDOOR TEMPERATURE (Degree F)
COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 85 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: (1) OUTDOOR TEMP. 95 F.
(2) INDOOR WET BULB 63 F.
(3) AT INTERSECTION
ACTUAL:
(4) LIQUID PRESSURE @ 1259 CFM IS 390 PSIG
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
(5) SUCTION PRESSURE @ 1259 CFM IS 132 PSIG
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
INTERCONNECTING LINES
Suction - 7/8"
Liquid - 3/8"
DWG.NO.
4TTA3042AD
110
115
120
125
130
135
140
145
150
155
160
165
170
70
80
90
100
110
120
130
250
300
350
400
450
500
550
600
70
80
90
100
110
120
130
(1)
(1)
(3)
(3)
(5)
(4)
(2)
(2)
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
PRESSURE CURVES FOR 4TTA3030AD
GAF2A0A36
Cooling with Thermal Expansion Valve
LI
Q
U
ID
PR
ESSU
R
E (PSI
G
)
OUTDOOR TEMPERATURE (Degree F)
SU
C
TI
O
N
PR
ESSU
R
E (PSI
G
)
OUTDOOR TEMPERATURE (Degree F)
COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 85 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: (1) OUTDOOR TEMP. 95 F.
(2) INDOOR WET BULB 63 F.
(3) AT INTERSECTION
ACTUAL:
(4) LIQUID PRESSURE @ 975 CFM IS 376 PSIG
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
(5) SUCTION PRESSURE @ 975 CFM IS 133 PSIG
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
INTERCONNECTING LINES
Suction - 3/4"
Liquid - 3/8"
DWG.NO.
4TTA3030AD
110
115
120
125
130
135
140
145
150
155
160
165
170
70
80
90
100
110
120
130
250
300
350
400
450
500
550
600
70
80
90
100
110
120
130
(1)
(1)
(3)
(3)
(5)
(4)
(2)
(2)
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
PRESSURE CURVES FOR 4TTA3042AD
GAT2A0A48
Cooling with Thermal Expansion Valve
LI
Q
U
ID
PR
ESS
UR
E
(PSI
G
)
OUTDOOR TEMPERATURE (Degree F)
SUC
TI
O
N
PR
ESS
UR
E
(PSI
G
)
OUTDOOR TEMPERATURE (Degree F)
COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 85 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: (1) OUTDOOR TEMP. 95 F.
(2) INDOOR WET BULB 63 F.
(3) AT INTERSECTION
ACTUAL:
(4) LIQUID PRESSURE @ 1581 CFM IS 399 PSIG
LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
(5) SUCTION PRESSURE @ 1581 CFM IS 141 PSIG
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
INTERCONNECTING LINES
Suction - 7/8"
Liquid - 3/8"
DWG.NO.
4TTA3042AD
110
115
120
125
130
135
140
145
150
155
160
165
170
70
80
90
100
110
120
130
250
300
350
400
450
500
550
600
70
80
90
100
110
120
130
(1)
(1)
(3)
(3)
(5)
(4)
(2)
(2)
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
6
4TTA3AD-SF-1A