Step 10 - Make Electrical Connections; Field Power Supply; Units Without Factory- - Installed Disconnect - Carrier 50HCQA User Manual

MINIMUM PITCH
1" (25mm) PER
BASE RAIL
10' (3m) OF LINE
OPEN
VENT
TO ROOF
DRAIN
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4" (102) trap is recommended
Fig. 14 - - 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 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 connection
3
( / -in.).
4
Step 10 — Make Electrical Connections
WARNING
!
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 NEC (National Electrical Code);
ANSI/NFPA 70, latest edition (in Canada, Canadian
Electrical Code CSA
Association] C22.1), and local electrical codes.
NOTE: Check all factory and field electrical connections
for tightness. Field- - supplied wiring shall conform with
the limitations of 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 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
2˝ (51) MIN
SEE NOTE
ROOF
CURB
DRAIN PLUG
.
C08022
[Canadian Standards
unit disconnect. On a unit without a unit- - mounted
disconnect, connect the source leads to compressor
contactor C and indoor fan contactor IFC pressure lugs
with unit field power leads.
All units except 208/230-v units are factory wired for the
voltage shown on the nameplate. If the 208/230-v unit is
to be connected to a 208-v power supply, the control
transformer must be rewired by moving the black wire
1
with the / -in. female spade connector from the 230- - v
4
connection and moving it to the 208-v
terminal on the primary side of the transformer. Refer to
unit label diagram for additional information. Field power
wires will be connected line- - side pressure lugs on the
power terminal block or at factory- - installed option
non- - fused disconnect.
Field power wires are connected to the unit at line- - side
pressure lugs on compressor contactor C and indoor fan
contactor IFC or terminal board (see wiring diagram label
for control box component
factory- - installed option non- - fused disconnect switch.
Max wire size is #2 AWG (copper only). (See Fig. 16)
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 connections directly to line
connection pressure lugs only.
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 furnace. Use only copper wire.
(See Fig. 15.)
ELECTRIC
DISCONNECT
SWITCH
WIRE ONLY
Fig. 15 - - Disconnect Switch and Unit
Units Without Factory- - Installed Disconnect —
When installing units, provide a disconnect switch per
NEC (National Electrical Code) of adequate size.
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.
11
1
/ -in. male
4
arrangement) or
COPPER
ALUMINUM
WIRE
A93033
at