Warning – Carrier 50TCQA User Manual

Page 11

NOTE: Trap should be deep enough to offset maximum unit static

difference. A 4” (102) trap is recommended

MINIMUM PITCH

1” (25mm) PER

10’ (3m) OF LINE

BASE RAIL

OPEN

VENT

TO ROOF

DRAIN

DRAIN PLUG

ROOF

CURB

SEE NOTE

2˝ (51) MIN

C08022

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

(

-in.).

Step 10 — Make Electrical Connections

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

[Canadian

Standards

Association] C22.1), and local electrical codes.

WARNING

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

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
with the

-in. female spade connector from the 230--v

connection and moving it to the 208-v

-in. male

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 arrangement) or at

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.)

COPPER

WIRE ONLY

ELECTRIC

DISCONNECT

SWITCH

ALUMINUM

WIRE

A93033

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.

50TC