Carrier 50JZ024, Installation, Start-Up And Service Instructions Manual

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condensate connection to ensure proper drainage. Make sure that
the outlet of the trap is at least 1 in. lower than the drain-pan
condensate connection to prevent the pan from overflowing. Prime
the trap with water. When using a gravel apron, make sure it slopes
away from the unit.
If the installation requires draining the condensate water away
from the unit, install a field-supplied 2-in. trap at the condensate
connection to ensure proper drainage. Condensate trap is available
as an accessory or is field-supplied. Make sure that the outlet of the
trap is at least 1 in. lower than the unit drain-pan condensate
connection to prevent the pan from overflowing. Connect a drain
trough using a minimum of field-supplied 3/4-in. PVC or field-
supplied 3/4 -in. copper pipe at outlet end of the 2-in. trap (Fig.
11). Do not undersize the tube. Pitch the drain trough downward at
a slope of at least 1 in. every 10 ft of horizontal run. Be sure to
check the drain trough for leaks. Prime the trap at the beginning of
the cooling season start-up.
Step 7—Install Electrical Connections
The 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 an electrical wire connected to the unit ground lug
in the control compartment, or conduit approved for electrical
ground when installed in accordance with NEC, ANSI/NFPA
American National Standards Institute/National Fire Protec-
tion Association (latest edition) (in Canada, Canadian Elec-
trical Code CSA C22.1) and local electrical codes. Failure to
adhere to this warning could result in serious injury or death.
Failure to follow these precautions could result in damage to
the unit being installed:
1. Make all electrical connections in accordance with NEC
ANSI/NFPA (latest edition) and local electrical codes
governing such wiring. In Canada, all electrical connec-
tions must be in accordance with CSA standard C22.1
Canadian Electrical Code Part 1 and applicable local
codes. Refer to unit wiring diagram.
2. Use only copper conductor for connections between
field-supplied electrical disconnect switch and unit. DO
NOT USE ALUMINUM WIRE.
3. Be sure that high-voltage power to unit is within operating
voltage range indicated on unit rating plate. On 3-phase
units, ensure phases are balanced within 2%. Consult local
power company for correction of improper voltage and/or
phase imbalance.
4. Insulate low-voltage wires for highest voltage contained
within conduit when low-voltage control wires are in same
conduit as high-voltage wires.
5. Do not damage internal components when drilling through
any panel to mount electrical hardware, conduit, etc.
HIGH-VOLTAGE CONNECTIONS — The unit must have a
separate electrical service with a field-supplied, waterproof dis-
connect switch mounted at, or within sight from the unit. Refer to
the unit rating plate, NEC and local codes for maximum
fuse/circuit breaker size and minimum circuit amps (ampacity) for
wire sizing. See Table 3 for electrical data.
The field-supplied disconnect may be mounted on the unit over the
high-voltage inlet hole (See Fig. 2 and 3).
If the unit has an electric heater, a second disconnect may be
required. Consult the Installation, Start-Up and Service Instruc-
tions provided with the accessory for electrical service connec-
tions.
Operation of unit on improper line voltage constitutes abuse and
may cause unit damage that could affect warranty.
ROUTING POWER LEADS INTO UNIT — Use only copper
wire between disconnect and unit. The high-voltage leads should
be in a conduit until they enter the duct panel; conduit termination
at the duct panel must be watertight. Run the high-voltage leads
through the power entry knockout on the power entry side panel
(See Fig. 2 and 3 for location and size). When the leads are inside
the unit, run leads up the high-voltage raceway to the line wiring
splice box (Fig. 12 through 14). For single-phase units, connect
leads to the black and yellow wires; for 3-phase units, connect the
leads to the black, yellow, and blue wires (Fig. 17).
CONNECTING GROUND LEAD TO GROUND LUG — Refer
to Fig. 17. Connect the ground lead to the chassis using the ground
lug in the wiring splice box.
ROUTING CONTROL POWER WIRES (24V) — Form a drip-
loop with the thermostat leads before routing them into the unit.
Route the thermostat leads through grommeted, low-voltage hole
provided in unit into unit control power splice box (See Fig. 2 and
3). Connect thermostat leads to unit control power leads as shown
in Fig. 16.
The unit transformer supplies 24v power for complete system
including accessory electrical heater. An automatic-reset circuit
breaker (Fig. 18) is provided in the 24v circuit; see the caution
label on the transformer or Fig. 19. Transformer is factory wired
for 230v operation. If supply voltage is 208v, rewire transformer
primary as described in Special Procedures for 208v Operation
section.
Fig. 11—Condensate Trap
C99013
1” MIN.
2” MIN.
TRAP
OUTLET
8