Step 11 - Install External Condensate Trap And Line; Step 12 - Make Electrical Connections; Field Power Supply - Carrier WeatherExpert 48LC 07 Series Installation Instructions Manual

disconnected from the gas valve during the testing of the piping
systems when test pressure is in excess of 0.5 psig (3450 Pa).
Pressure test the gas supply piping system at pressures equal to or
less than 0.5 psig (3450 Pa). The unit heating section must be iso-
lated from the gas piping system by closing the external main
manual shutoff valve and slightly opening the ground-joint union.
Check for gas leaks at the field-installed and factory-installed
gas lines after all piping connections have been completed. Use
soap-and-water solution (or method specified by local codes
and/or regulations).
WARNING
Failure to follow this warning could result in personal inju-
ry, death and/or property damage.
• Connect gas pipe to unit using a backup wrench to
avoid damaging gas controls.
• Never purge a gas line into a combustion chamber.
• Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically
for the detection of leaks to check all connections.
• Use proper length of pipe to avoid stress on gas control
manifold.
NOTE: If orifice hole appears damaged or if it is suspected to have
been redrilled, check orifice hole with a numbered drill bit of cor-
rect size. Never redrill an orifice. A burr-free and squarely aligned
orifice hole is essential for proper flame characteristics. See
Fig. 22.
Fig. 22 — Orifice Hole
Step 11 — Install External Condensate Trap and
Line
The unit has one 3 / -in. condensate drain connection on the end
4
of the condensate pan and an alternate connection on the bot-
tom. See Fig. 23. Unit airflow configuration does not deter-
mine which drain connection to use. Either drain connection
can be used with vertical or horizontal applications.
To use the alternate bottom drain connection, remove the red
drain plug from the bottom connection (use a
et drive extension) and install it in the side drain connection.
The piping for the condensate drain and external trap can be
completed after the unit is in place. See Fig. 24.
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
unit connection ( 3 / -in.).
4
Step 12 — Make Electrical Connections
BURNER
ORIFICE
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
1 / -in. square sock-
primary are not factory connected. Installer must connect these
2
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 (see
Fig. 25).
15
CONDENSATE PAN (SIDE VIEW)
STANDARD
SIDE DRAIN
Fig. 23 — Condensate Drain Pan (Side View)
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-in. (102 mm) trap is recommended.
Fig. 24 — Condensate Drain Piping Details
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 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 (National Electrical
Code); ANSI/NFPA 70, latest edition (in Canada, Canadian
Electrical Code CSA [Canadian Standards Association]
C22.1), and local electrical codes.
ALTERNATE
DRAIN PLUG
BOTTOM DRAIN
(FACTORY-INSTALLED)
3 in. (76 mm)
MIN
SEE NOTE
ROOF
CURB
DRAIN PLUG