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Electrical Wiring
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WARNING:
DUE TO ELECTRICAL SHOCK OR CONTACT WITH MOVING
PARTS. LOCK UNIT DISCONNECT SWITCH IN OPEN
POSITION BEFORE SERVICING UNIT.
Electrical Connections
Electrical wiring and grounding must be installed in accordance
with local codes or, in the absence of local codes, with the National
Electrical Code ANSI/NFPA 70, Latest Revision.
Disconnect Switch
Provide an approved weather-proof disconnect either on the side
of the unit or within close proximity and within sight of the
unit.
Over Current Protection
The branch circuit feeding the unit must be protected as shown
on the unit rating plate.
Power Wiring
The power supply lines must be run in weathertight conduit to
the disconnect and into the bottom of the unit control box.
Provide strain relief for all conduit with suitable connectors.
Provide flexible conduit supports whenever vibration transmis-
sion may cause a noise problem within the building structure.
Ensure all connections are made tight. See Figures 5 and 6:
Typical Field Wiring Diagrams.
NOTES:
1. For branch circuit wiring (main power supply to the unit
disconnect), wire size for the length of run should be
determined using the circuit ampacity found on the unit
nameplate and the N.E.C.
2. For more than 3 conductors in a raceway or cable, see the
N.E.C. for derating the ampacity of each conductor.
3. Wire size is based on 75 degrees C rated wire insulation.
Grounding
The unit must be electrically grounded in accordance
with local codes or the National Electrical Code.
Accessories
All electrical accessories must be installed and wired according
to the instructions packaged with the accessory.
Control Wiring (Class II)
Low voltage control wiring should not be run in the same conduit
with the power wiring unless Class I wire of the proper voltage
rating is used. Route the thermostat cable or equivalent single
leads of No. 18 AWG colored wire from the thermostat subbase
terminals through the rubber grommet on the unit. See Figure
1 for the control entry location. Make connections as shown on
the unit wiring diagram and in Figures 5 and 6.
Do not short thermostat wires since this will damage the control
transformer.
Page 6
TO PREVENT INJURY OR DEATH
Electrical Wiring
Recommended wire sizes and lengths for installing the unit
thermostat are provided in Table 1: Thermostat Wire Size
and Maximum Length. The total resistance of these low
voltage wires must not exceed one (1) ohm. Any resistance in
excess of one (1) ohm may cause the control to malfunction
because of the excessive voltage drop.
IMPORTANT: Upon completion of wiring check all elec-
trical connections, including factory wiring within the
unit.
Make sure all connections are tight. Replace and secure all
electrical box covers and access doors before leaving the unit or
turning on the power to the unit.
After all electrical wiring is complete, set the thermostat system
switch on the OFF position so that the compressor will not run
and then apply power by closing the system main disconnect
switch. This will activate the compressor sump heat. Do not
change the Thermostat System Switch until power has been
applied long enough to evaporate any liquid HCFC-22 in the
compressor. It is recommended that the sump heat be energized
for a minimum of eight (8) hours prior to starting the unit.
Thermostat Wire Size and Maximum Length
WIRE SIZE
18
16
14
Air Filters
•These units require filters with adequate filter area be pro-
vided in the return air duct. Table 2 below gives filter data. The
specific location of the filters depends on the type of installation
and the layout of the duct system. Be sure the owner is aware
of the location of the filter and the need to change them as
required. The Filter Size (Sq.. Ft.) are based on 300 F.P.M. face
velocity. If permanent filters are used, size per mfg. recommen-
dation with clean resistance of .05" WC.
Table 2. Filter Data
NOMINAL
UNIT
CFM
TCH024B
800
TCH030B
1000
TCH036B
1200
TCH042B
1400
TCH048F
1600
TCH060F
2000
Table 1
MAXIMUM LENTGH (Ft)
75
125
200
FILTER*
FILTER
(Sq Ft) SIZE
RESISTANCE
2.67
3.33
4.00
4.67
5.20
6.67
0.05
0.05
0.05
0.05
0.05
0.05
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