Carrier 48ES---A - Manual (Page 13)

13
connections (See Fig. 11). Secure all cut wires, so that they do not
interfere with operation of unit.
POWER
SUPPLY
FIELD-SUPPLIED
FUSED DISCONNECT
HIGH VOLTAGE
POWER LEADS
(SEE UNIT WIRING
LABEL)
EQUIP GR
3-PHASE SHOWN
1-PHASE USES
TWO POWER
LEADS
CONTROL BOX
SPLICE BOX
LOW-VOLTAGE
POWER LEADS
(SEE UNIT
WIRING LABEL)
W
Y
G
R
C
WHT(W1)
YEL(Y)
GRN(G)
RED(R)
BRN(C)
THERMOSTAT
(TYPICAL)
DH
BLU(DH)
GRA(Y2)
3-Phase
Only
A09053
Fig. 11 -- High-- and Control--Voltage Connections
Heat Anticipator Setting (Electro--Mechanical
Thermostats only)
The room thermostat heat anticipator must be properly adjusted to
ensure proper heating performance. Set the heat anticipator, using
an ammeter between the W and R terminals to determine the exact
required setting.
NOTE: For thermostat selection purposes, use 0.18 amp for the
approximate required setting. Failure to make a proper heat
anticipator adjustment will result in improper operation, discomfort
to the occupants of the conditioned space, and inefficient energy
utilization; however, the required setting may be changed slightly
to provide a greater degree of comfort for a particular installation.
Transformer Protection
The transformer is of the energy--limiting type, however a direct
short will likely blow a secondary fuse. If an overload or short is
present, correct overload condition and check for blown fuse on
Indoor Fan board or Integrated Gas Controller. Replace fuse as
required with correct size and rating.
PRE--START--UP
ENVIRONMENTAL, FIRE, EXPLOSION,
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
1. Follow recognized safety practices and wear protective
goggles when checking or servicing refrigerant system.
2. Do not operate compressor or provide any electric power
to unit unless compressor plug is in place and secured.
3. Do not remove ccompressor plug until all electrical
sources are disconnected and tagged.
4. Relieve and recover all refrigerant from system before
touching or disturbing compressor plug if refrigerant
leak is suspected around compressor terminals.
5. Never attempt to repair soldered connection while
refrigerant system is under pressure.
6. Do not use torch to remove any component. System
contains oil and refrigerant under pressure.
To remove a component, wear protective goggles and
proceed as follows:
a. Shut off electrical power to unit and install
lockout tag.
b. Relieve and reclaim all refrigerant from system
using both high-- and low--pressure ports.
c. Cut component connecting tubing with tubing
cutter and remove component from unit.
d. Carefully unsweat remaining tubing stubs when
necessary. Oil can ignite when exposed to torch
flame.
! WARNING
Use the Start--Up Checklist supplied at the end of this book and
proceed as follows to inspect and prepare the unit for initial
start--up:
1. Remove access panels (see Fig. 20).
2. Read and follow instructions on all DANGER, WARNING,
CAUTION, and INFORMATION labels attached to, or
shipped with unit.
3. Make the following inspections:
a. Inspect for shipping and handling damage, such as
broken lines, loose parts, disconnected wires, etc.
b. Inspect for oil at all refrigerant tubing connections and
on unit base. Detecting oil generally indicates a
refrigerant leak.
c. Leak--test all refrigerant tubing connections using
electronic leak detector, or liquid--soap solution. If a
refrigerant leak is detected, see following Check for
Refrigerant Leaks section.
d. Inspect all field-- and factory--wiring connections. Be
sure that connections are completed and tight.
e. Ensure wires do not touch refrigerant tubing or sharp
sheet metal edges.
f. Inspect coil fins. If damaged during shipping and
handling, carefully straighten fins with a fin comb.
48E
S
--
A