Electrical Wiring; Air Filters - Trane WCH024C1 Installation Operation & Maintenance

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 trans-
mission may cause a noise problem within the building struc-
ture.
•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.
Page 6
TO PREVENT INJURY OR DEATH
Electrical Wiring
•Do not short thermostat wires since this will damage the
control transformer.
•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
electrical 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.
NOMINAL
UNIT
CFM
WCH024C 800
WCH030C 1000
WCH036C 1200
WCH042C 1400
WCH048F 1600
WCH060F 2000
Table 2. Filter Data
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