Carrier WeatherMaker 50KCQ A04 Series Installation Instructions Manual page 17

The piping for the condensate drain and external trap can be
completed after the unit is in place. See Fig. 22.
MINIMUM PITCH
1˝ (25 mm) PER
BASE RAIL
10´ (3 m) OF LINE
OPEN
VENT
TO ROOF
DRAIN
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4-in. (102 mm) trap is recommended.
Fig. 22 — 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 exter-
nal 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
3
unit connection ( / -in.).
4
Step 11 — Make Electrical Connections
WARNING
ELECTRIC SHOCK HAZARD
Failure to follow this warning could result in personal inju-
ry or death.
Unit cabinet must have an uninterrupted, unbroken electri-
cal 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 com-
partment, or conduit approved for electrical ground when
installed in accordance with NEC; ANSI/NFPA 70, latest
edition (in Canada, Canadian Electrical Code CSA [Cana-
dian Standards Association] C22.1), and local electrical
codes.
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 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 ter-
minal block (IFTB) pressure lugs with unit field power leads.
Refer to Fig. 29 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 arrangement)
or at factory-installed option non-fused disconnect switch. Max
3˝ (76 mm)
MIN
SEE NOTE
ROOF
CURB
DRAIN PLUG
wire size is #2 AWG (copper only). See Fig. 23 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 op-
tional disconnect switch. These leads are for factory run-test pur-
poses only; remove and discard before connecting field power
wires to unit connection points. Make field power connections di-
rectly to line connection pressure lugs only.
Units Without Non-Fused Disconnect Option
C
11
Disconnect
L1
208/230-1-60
208/230-3-60
Units With Non-Fused Disconnect Option
L1 2
L2 4
L3
6
Disconnect factory test leads; discard.
Fig. 23 — Power Wiring Connections
FIRE HAZARD
Failure to follow this warning could result in intermittent
operation or performance satisfaction.
Do not connect aluminum wire between disconnect switch
and 50KCQ unit. Use only copper wire. (See Fig. 24.)
ELECTRIC
DISCONNECT
SWITCH
Fig. 24 — Disconnect Switch and Unit
UNITS WITH FACTORY-INSTALLED
DISCONNECT
The factory-installed option non-fused disconnect (NFD)
switch is located in a weatherproof enclosure located under the
main control box. The manual switch handle and shaft are
shipped in the disconnect enclosure. Assemble the shaft and
handle to the switch at this point. Discard the factory test leads
(see Fig. 23).
17
IFC
(3 Phase
Indoor Motor)
(1 Phase Indoor Motor
13 13 TB
and 1 Phase Unit)
per
NEC
L2 L3
460-3-60
575-3-60
1
Optional
Factory
Disconnect
3
Wiring
Switch
5
WARNING
COPPER
WIRE ONLY
ALUMINUM
WIRE
NON-FUSED