27
Fig. 30 — Condensate Drain Pan Connection
The piping for the condensate drain and external trap can be com-
pleted after the unit is in place. Hand tighten fittings to the drain
pan fitting. Provide adequate support for the drain line. Failure to
do so can result in damage to the drain pan. See Fig. 31.
Fig. 31 — Condensate Drain Piping Details
All units must have an external trap for condensate drainage. In-
stall a trap at least 4-in. (102 mm) deep and protect against
freeze-up. If drain line is installed downstream from the external
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 connec-
tion (
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 accord-
ing to required operation of the convenience outlet. If an always-
energized convenience outlet operation is desired, connect the
source leads to the line side of the unit-mounted disconnect.
(Check with local codes to ensure 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 the line side with unit field
power leads. See Fig. 32.
Fig. 32 — Location of TB1
Field power wires are connected to the unit at line-side pressure
lugs on the terminal block (see wiring diagram label for control
box component arrangement) or at factory-installed option non-
fused disconnect switch. Use copper conductors only. See Fig. 33.
NOTE: Make field power connections directly to line connection
pressure lugs only.
Fig. 33 — Disconnect Switch and Unit
WARNING
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 elec-
trical wire connected to unit ground lug in control compart-
ment, or conduit approved for electrical ground when installed
in accordance with NEC (National Electrical Code); ANSI/
NFPA 70, latest edition (in Canada, Canadian Electrical Code
CSA [Canadian Standards Association] C22.1), and local elec-
trical codes.
CONDENSATE
DRAIN
CONNECTION
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 personal injury,
death, or property damage.
Do not connect aluminum wire between disconnect switch and
unit. Use only copper wire.
LOAD
SIDE
SEE
DETAIL
A
DETAIL
A
LINE
SIDE
BLK
YEL
BLU
CONTROL BOX
L3
L2
L1
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
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