14
Fig. 19 — Condensate Drain Piping Details
NOTE: All units must have an external trap for condensate drain-
age. Install 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: Check all factory and field electrical connections for tight-
ness. 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 convenience out-
let. If an always-energized convenience outlet operation is de-
sired, 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 de-
sired, connect the source leads to the load side of the unit dis-
connect. On a unit without a unit-mounted disconnect, connect
the source leads to compressor contactor C and indoor fan con-
tactor IFC pressure lugs with unit field power leads.
Refer to Fig. 28 for power transformer connections and the dis-
cussion on connecting the convenience outlet on page 18.
Field power wires are connected to the unit at line-side pressure
lugs on compressor contactor C and indoor fan contactor IFC
(see wiring diagram label for control box component arrange-
ment) or at factory-installed option non-fused disconnect switch.
Maximum wire size is #2 AWG (copper only). See Fig. 20 and
unit label diagram for field power wiring connections.
NOTE: TEST LEADS - Unit may be equipped with short leads
(pigtails) on the field line connection points on contactor C or
optional disconnect switch. These leads are for factory run-test
purposes only; remove and discard before connecting field
power wires to unit connection points. Make field power con-
nections directly to line connection pressure lugs only.
Fig. 20 — Power Wiring Connections
Fig. 21 — Disconnect Switch and Unit
WARNING
Failure to follow this warning could result in personal inju-
ry 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 NEC (National Electrical Code); 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 intermittent
operation or performance satisfaction.
Do not connect aluminum wire between disconnect switch and
50TCQ unit. Use only copper wire. (See Fig. 21.)
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
11 13 13
L1
L2 L3
TB
C
IFC
(3 Phase
Indoor Motor)
(1 Phase Indoor Motor
and 1 Phase Unit)
208/230-1-60
208/230-3-60
460-3-60
575-3-60
Disconnect
per
NEC
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
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