13
The piping for the condensate drain and external trap can be
completed after the unit is in place. See Fig. 17.
Fig. 17 — Condensate Drain Piping Details
All units must have an external trap for condensate drainage.
Install a trap at least 4-in. (102 mm) deep and protect against
freeze-up. If drain line is installed downstream from the ex-
ternal trap, pitch the line away from the unit at 1-in. per 10 ft
(25 mm in 3 m) of run. Do not use a pipe size smaller than the
unit connection (
3
/
4
-in.).
Step 11 — Make Electrical Connections
NOTE: Field-supplied wiring shall conform with the limitations
of minimum 63°F (33°C) rise.
FIELD POWER SUPPLY
If equipped with optional Powered Convenience Outlet: The
power source leads to the convenience outlet’s transformer
primary are not factory-connected. Installer must connect
these leads according to required operation of the conve-
nience outlet. If an always-energized convenience outlet op-
eration is desired, connect the source leads to the line side of
the unit-mounted disconnect. (Check with local codes to en-
sure this method is acceptable in your area.) If a de-energize
via unit disconnect switch operation of the convenience outlet
is desired, connect the source leads to the load side of the unit
disconnect. On a unit without a unit-mounted disconnect,
connect the source leads to compressor contactor C and in-
door fan terminal block (IFTB) pressure lugs with unit field
power leads.
Refer to Fig. 24 for power transformer connections and the
discussion on connecting the convenience outlet on page 15.
Field power wires are connected to the unit at line-side pres-
sure lugs on compressor contactor C and indoor fan contactor
IFC (see wiring diagram label for control box component ar-
rangement) or at factory-installed option non-fused discon-
nect switch. Max wire size is #2 AWG (copper only). See
Fig. 18 and unit label diagram for field power wiring connec-
tions.
NOTE: TEST LEADS — Unit may be equipped with short
leads (pigtails) on the field line connection points on contac-
tor C or optional disconnect switch. These leads are for facto-
ry run-test purposes only; remove and discard before con-
necting field power wires to unit connection points. Make
field power connections directly to line connection pressure
lugs only.
Fig. 18 — Power Wiring Connections
Fig. 19 — Disconnect Switch and Unit
WARNING
ELECTRIC SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
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 NEC; ANSI/NFPA 70,
latest edition (in Canada, Canadian Electrical Code CSA
[Canadian Standards Association] C22.1), and local
electrical codes.
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4-in. (102 mm) trap is recommended.
MINIMUM PITCH
1˝ (25 mm) PER
10´ (3 m) OF LINE
BASE RAIL
OPEN
VENT
TO ROOF
DRAIN
DRAIN PLUG
ROOF
CURB
SEE NOTE
3˝ (76 mm)
MIN
WARNING
FIRE HAZARD
Failure to follow this warning could result in intermit-
tent operation or performance satisfaction.
Do not connect aluminum wire between disconnect
switch and 50KC unit. Use only copper wire. (See
Fig. 19.)
Disconnect
per
NEC
Disconnect
per
NEC
208/230-1-60
11 1 3 11 13 13
L1
L2 L3
TB
C
C IFC
or
(1-ph
IFM)
208/230-3-60
460-3-60
575-3-60
Units Without Non-Fused Disconnect Option
Units With Non-Fused Disconnect Option
2
4
6
1
3
5
L1
L2
L3
Optional
Disconnect
Switch
Disconnect factory test leads; discard.
Factory
Wiring
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
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