50TC*D
13
All units must have an external trap for condensate
drainage. Install a trap at least 102 mm (4-in.) deep and
protect against freeze-up. If drain line is installed
downstream from the external trap, pitch the line away
from the unit at 25 mm in 3 m (1-in. per 10 ft) of run. Do
not use a pipe size smaller than the unit connection of
19 mm (
3
/
4
-in. ).
Step 10 — Make Electrical Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Do not use gas piping as an electrical ground. Unit
cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of
personal injury if an electrical fault should occur. This
ground may consist of electrical wire connected to
unit ground lug in control compartment, or conduit
approved for electrical ground when installed in
accordance with local electrical codes or in absence
of local codes, it is recommended that the U.S.A.
standard ANSI/NFPA 70, National Electrical Code
(NEC), be followed.
!
WARNING
NOTE: Check all factory and field electrical connections
for tightness. Field--supplied wiring shall conform with
the limitations of 33_C(63_F) rise.
Field power wires are connected to the unit at line--side
pressure lugs on the terminal block (see Fig. 19 or the
wiring diagram label for control box component
arrangement) or at factory--installed option non--fused
disconnect switch. Use copper conductors only.
NOTE: Make field power connections directly to line
connection pressure lugs only.
The unit is factory wired for the voltage shown on the
nameplate. Refer to unit label diagram for additional
information.
!
WARNING
FIRE HAZARD
Failure to follow this warning could result in
intermittent operation or performance satisfaction.
Do not connect aluminum wire between disconnect
switch and air conditioning unit. Use only copper
wire.(SeeFig.16.)
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
A93033
Fig. 16 -- Disconnect Switch and Unit
Units Without Factory--Installed Disconnect —
When installing units, provide a disconnect switch of
adequate size per local or national wiring code.
Disconnect sizing data is provided on the unit informative
plate. Locate on unit cabinet or within sight of the unit per
national or local codes. Do not cover unit informative
plate if mounting the disconnect on the unit cabinet.
Units with Factory--Installed Disconnect —
The factory--installed option disconnect switch is located
in the main control box. The manual switch handle is
accessible on the corner post adjacent to the control box
access panel.
All units --
All field wiring must comply with all local codes. Size
wire based on MCA (Minimum Circuit Amps) on the unit
informative plate. See Fig. 17 for power wiring
connections to the unit power terminal block and
equipment ground.
Provide a ground--fault and short--circuit over--current
protection device (fuse or breaker) per local codes (or
U.S.A. NEC Article 440). Refer to unit informative data
plate for MOCP (Maximum Over--current Protection)
device size.
All field wiring must comply with the appropriate national
electrical codes and local requirements.
11 12 13
L1
L2 L3
TB
Units Without Disconnect Option
Units With Disconnect Option
T1 T2 T3
L1 L2 L3
L1 L2 L3
Factory
Wiring
Disconnect
Optional
Disconnect
Switch
C09388
Fig. 17 -- Power Wiring Connections
Table 2 – American/European Wire Conversions
AMERICAN EUROPEAN
Industry
Standard Size
American
Conversion (mm
2
)
European
Standard Size (mm
2
)
20 AW G 0.52 0.5
18 AW G 0.82 1.0
16 AW G 1.30 1.5
14 AW G 2.08 2.5
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