INSTALLATION
Since the condensing units are shipped with a holding charge
of refrigerant-22, they can be checked for a refrigerant leak by
opening the access port on the liquid line service valve as fol-
lows:
1. Open the valve by turning the stem to its maximum counter-
clockwise position.
2. Remove the cap from the access port.
WARNING: Provisions for recovering refrigerant releases
must be available during all phases of installa-
tion, leak testing and charging. Do NOT re-
lease refrigerant into the atmosphere.
3. Turn the stem in (or clockwise) between 1/4 and 1/2 turn to
open the access port.
As soon as some internal pressure is relieved, close the access
port. DO NOT release the entire holding charge.
If the unit has already lost its holding charge, it should be leak
tested and the necessary repairs should be made. If the unit
has maintained its holding charge, you can assume that it has
no leaks and proceed with the installation.
CAUTION: Dry nitrogen should always be supplied through a
connection while it is being brazed or unbrazed be-
cause the temperature required to make or break a
brazed joint is sufficiently high to cause oxidation
of the copper unless an inert atmosphere is pro-
vided. The flow of nitrogen should be continued un-
til the joint has cooled.
WARNING: The dry nitrogen should always be supplied
through a pressure regulating valve.
On 090 MBH models only, remove the 4-1/2" (114mm) square
patch plates from the piping access panel on the front of the
unit to expose the refrigerant connections.
Before installing the liquid line between the condensing unit
and the evaporator coil, prepare as follows:
1. Burnish the external surfaces of the liquid connection on
the condensing unit and the end of the field-supplied piping
for the liquid line.
NOTE: Clean surfaces are essential for a well-brazed con-
nection.
2. Carefully clean the internal surfaces of the above. Any par-
ticles left on these surfaces may lead to a future system
malfunction.
NOTE: Use only copper tubing that has been especially
cleaned and dehydrated for refrigerant use. If the
tubing has been open for an extended period of
time, it should be cleaned before being used.
The liquid line connections can now be brazed while maintain-
ing a minimum flow of dry nitrogen through the piping as fol-
lows:
1. Remove the cap from the 1/4" (6mm) access port on the liq-
uid line service valve.
2. Connect a supply of dry nitrogen to this access port.
NOTE: The filter-drier and the moisture indicating sight glass
should be installed in the liquid line as close to the
evaporator coil as possible.
Do not allow the filter-drier to be exposed to the atmos-
phere for an extended period of time. Once it absorbs
035-15406-002-A-0504
Unitary Products Group
9
Unit
Size
(MBH)
Suction Press. & Corresponding
Temp. @ Saturation
Temperature of Air on Condenser Coil,
°
F
65
75
85
95
105
115
PSIG
°
F
MBH
KW*
MBH
KW*
MBH
KW*
MBH
KW*
MBH
KW*
MBH
KW*
090
54.9
30
85
6.0
80
6.5
76
7.1
72
7.7
68
8.4
64
9.2
61.6
35
92
6.2
88
6.7
84
7.2
80
7.8
75
8.5
71
9.3
68.5
40
100
6.3
96
6.8
92
7.4
87
8.0
83
8.7
78
9.5
76.0
45
109
6.5
104
7.0
100
7.5
95
8.1
90
8.8
86
9.6
84.0
50
118
6.7
113
7.2
108
7.7
103
8.3
98
9.0
93
9.8
120
54.9
30
106
7.0
102
7.6
97
8.3
93
9.0
88
10.0
84
11.0
61.6
35
116
7.2
111
7.8
106
8.4
102
9.2
97
10.1
92
11.2
68.5
40
127
7.4
122
8.0
116
8.6
110
9.4
105
10.3
99
11.4
76.0
45
139
7.6
133
8.2
126
8.8
119
9.6
113
10.5
106
11.5
84.0
50
151
7.8
144
8.4
136
9.0
128
9.8
120
10.6
112
11.6
*
Includes compressor and condenser fan motor(s).
TABLE 7 - COOLING CAPACITIES AND POWER REQUIREMENTS - w/Fahrenheit Temperature Values
Unit
Size
(MBH)
Suction Press. & Corre-
sponding
Temp. @ Saturation
Temperature of Air on Condenser Coil,
°
C
20
25
30
35
40
45
kPa
°
C
kW
(Thermal)
kW*
(Input)
kW
(Thermal)
kW*
(Input)
kW
(Thermal)
kW*
(Input)
kW
(Thermal)
kW*
(Input)
kW
(Thermal)
kW*
(Input)
kW
(Thermal)
kW*
(Input)
090
365
-2
25
6.0
23
6.5
22
7.1
21
7.7
20
8.4
19
9.2
413
1
27
6.2
26
6.7
25
7.2
23
7.8
22
8.5
21
9.3
465
4
29
6.3
28
6.8
27
7.4
25
8.0
24
8.7
23
9.5
520
7
32
6.5
30
7.0
29
7.5
28
8.1
26
8.8
25
9.6
580
10
35
6.7
33
7.2
32
7.7
30
8.3
29
9.0
27
9.8
120
365
-2
31
7.0
30
7.6
28
8.3
27
9.0
26
10.0
25
11.0
413
1
34
7.2
33
7.8
31
8.4
30
9.2
28
10.1
27
11.2
465
4
37
7.4
36
8.0
34
8.6
32
9.4
31
10.3
29
11.4
520
7
41
7.6
39
8.2
37
8.8
35
9.6
33
10.5
31
11.5
580
10
44
7.8
42
8.4
40
9.0
37
9.8
35
10.6
33
11.6
*
These input values include compressor and condenser fan motor(s).
TABLE 8 - COOLING CAPACITIES AND POWER REQUIREMENTS - w/Celsius Temperature Values
