41
Piping Insulation
Chilled water and condensate pipes should be insulated right up
to the unit chassis to prevent condensation, which can damage
the ceiling and objects located below the piping. Chilled water
valves must also be insulated to prevent sweating.
Wiring
Installation of wiring must conform with local building
codes, or in the absence of local codes, with the National
Electric Code ANSI/NFPA (American National Standards In-
stitute/National Fire Protection Association) 70 - Latest Edi-
tion. Unit must be electrically grounded in conformance to
this code. In Canada, wiring must comply with CSA (Canadi-
an Standards Association) C22.1, Electrical Code.
Electric wiring must be sized to carry the full load amp draw
of the motor, starter and any controls that are used with the
unit. See Table 3 for electrical data.
This equipment in its standard form is designed for an electrical
supply of 208/230-1-60. When connection to a 115-1-60 supply
is necessary, a factory-mounted step-up transformer must be fit-
ted to the unit. Any damage to or failure of units caused by incor-
rect wiring of the units is not covered by warranty.
Once the pipe work is complete, the electrical supply can be
connected by routing the cable through the appropriate casing
hole and connecting the supply and ground cables to the unit's
power terminals.
NOTE: A plastic sleeve is provided inside the control panel.
Low voltage control wiring must run through the plastic sleeve
on the inside of the control panel.
WARNING
Disconnect power supply before making wiring connec-
tions to prevent electrical shock and equipment damage.
All appliances must be wired strictly in accordance with
the wiring diagram furnished with the appliance. Any
wiring different from the wiring diagram could result in
a hazard to persons and property.
CAUTION
Any original factory wiring that requires replacement
must be replaced with wiring material having a tempera-
ture rating of at least 105°C.
Ensure supply voltage to the appliance, as indicated on
the serial plate, is not more than 5% over rated voltage or
less than 5% under the rated voltage. Failure to follow
these recommendations may result in equipment damage.
Table 3 — Electric Data for All Voltages and for Units With or Without Electric Heat
42WKN
NOMINAL
CAPACITY
(DIGIT 6, 7)
SUPPLY
VOLTAGE
(DIGIT 8)
PERFORMANCE (WITH ELECTRIC HEAT)
PERFORMANCE (NO ELECTRIC HEAT)
FLA
MCA
Recommended
Fuse Size
FLA
MCA
Recommended
Fuse Size
08 and 12
Small Chassis
A: 115/60/1
–
–
–
0.70
0.88
15
J: 110/50/1
B: 208/60/1
6.25
7.81
15
0.35
0.44
15
C: 230/60/1
6.87
8.59
15
K:220/50/1
6.59
8.24
15
H: 277/60/1
–
–
–
0.29
0.36
15
18 and 20
Medium
Chassis
A: 115/60/1
–
–
–
1.10
1.38
15
J: 110/50/1
B: 208/60/1
12.35
15.44
20
0.55
0.69
15
C: 230/60/1
13.59
16.99
20
K: 220/50/1
13.03
16.29
20
H: 277/60/1
–
–
–
0.46
0.58
15
30 and 36
Large Chassis
A: 115/60/1
–
–
–
1.92
2.40
15
J: 110/50/1
B: 208/60/1
20.68
25.85
30
0.96
1.20
15
C: 230/60/1
22.76
28.45
30
K: 220/50/1
21.81
27.26
30
H: 277/60/1
–
–
–
0.80
1.00
15
