Carrier 50AH024-060 - Manual (Page 4)

Table 2 — Electrical Data
UNIT
50AH
FAN MOTORS POWER SUPPLY
V-PH-HZ Indoor Outdoor Min Ckt MOCP
Min Max RLA LRA Hp FLA Hp FLA Amps Amps
024 230-1-60 207 254 126 64 0 33 1 32 .31
NEC
34 20 8 25
230-1-60 207 254 17 5 86 7 50 3 20 75 6 06 31 7 40
036 208/230-3-60 187 254 121 65 1 50 3 20 1 0 3 93 22 0 30
460-3-60 414 508 5.6 32.8 .50 1.50 1.0 1.97 11.0 15*
230-1-60 207 254 22 5 98 0 75 40 1 0 8 35 40 5 60
048
208/230-3-60 187 254 160 80 0 75 40 1 0 3 93 27 9 35
460-3-60 414 508 72 35 0 75 2 15 1.0 1 97 132 15*
575-3-60 518 632 6,8 27.0 .75 1.40 1.0 1.45 11.4 15
230-1-60 207 254 32 5 130 0 75 4.0 1 5 9 50 55 0 70*
060
208/230-3-60 187 254 21 7 98 0 75 40 1 5 4 82 36 6 45
460-3-60 414 508 108 49 0 75 2 15 1 5 2 41 185 25*
575-3-60 518 632 83 41 0 75 1 40 1 5 1 90 139 20
FLA — Full Load Amps
Hp
— Horsepower
LRA — Looked Rotor Amps
MOCP — Maximum Overcurrent Protection
RLA — Rated Load Amps 'Fuse oniy
Step 6 — Install Ductwork — Use flexible duct­
work to attach duct to unit and to help control trans­
mission of vibrations to building structures. Attach
ductwork to the return and supply ends of both coils.
If unit is located with condenser close to outside of
building, install a field-supplied rain hood. Hood intake
dimensions should be same as eondenser return air
dimensions. In addition, install a triple layer bird screen
over rain hood intake to eliminate possibility of insects,
birds, water or debris from entering unit.
Step 7 — Make Electrical Connections — Con­
nect power wiring to junction box located on unit side
near control box access panel. All wiring must comply
with National Electrical Code and all local code
requirements.
Operating voltage to compressor must be within volt­
age range as indicated on unit nameplate. On 3-phase
units, voltages between phases must be balanced within
2% and current must be balanced within 10%. Contact
local power company for correction of improper voltage
or phase imbalance. Unit failure as a result of operation
on improper line voltage or excessive phase imbalance
constitutes abuse and may cause damage to electrical
components. Such operation would invalidate any appli­
cable Carrier warranty.
Install a fused disconnect per NEC on the 5-ton (060)
230-1-60 unit. Refer to unit informative nameplate and
Table 2 for fuse sizes and wire amperages for all units.
NOTE: The following installation steps are for unsplit
systems. For split systems, 8 suspension rods are required.
Also refer to following Splitting Systems instructions:
Splitting Systems — 50AH roomtop units may be
split into 2 sections if desired, with condensing section
mounted remotely either horizontally or vertically. If
sections are installed in same horizontal plane they may
be separated by up to 75 ft of tubing.
Condensing section must be located in same plane as
or above evaporator section to maintain the liquid refrig­
erant seal at the expansion device. This permits expan­
sion device to feed liquid refrigerant to evaporator coil
properly. To split sections (the following sequence of
steps may be adjusted depending on particular
application):
1. Disconnect all electrical power to unit.
2. Remove 4 bolts connecting the 2 sections.
3. Remove top panels from each section.
4. Bleed off the refrigerant through the Schrader valve
located in evaporator section.
5. Cut refrigerant piping in the evaporator section just
inside the partition between the 2 sections.
6. Unsweat the cut portions of the refrigerant piping in
evaporator section at the closest bell joint. The bell
joints are used to connect field-supplied refrigerant
piping to evaporator section. Cut and braze a length
of tubing to extend refrigerant piping outside the
evaporator section.
7. Cut outdoor fan motor wiring at the partitions
separating condenser and evaporator sections. Install
a junction box adjacent to D-shaped grommet on the
partition.
8. In the condenser section, install a junction box
adjacent to the D-shaped grommet.
9. Install evaporator and condensing sections in
desired locations referring to remainder of these
instructions.
10. Use appropriate length of no. 16 AWG (minimum),
4/ 64 insulated copper wire to reconnect cut outdoor
fan motor wires. Make connections in junction boxes
installed in earlier steps. Follow all applicable elec­
trical codes.
11. Use sufficient length of refrigeration piping to
reconnect piping cut in previous step. Refer to
Carrier System Design Manual, Part 3, for additional
piping data.
After splitting sections, additional refrigerant must be
added to system to ensure proper refrigerant charge. The
amount of refrigerant to be added depends on length of
tubing added to system and operating temperatures of
system. Refer to Carrier System Design Manual,
Chapter 3.
Since standard roomtop unit has negligible line losses,
splitting the system can increase line loss and decrease
system capacity. Capacity reduction can be determined
referring to Carrier System Design Manual.
12. Recharge unit with R-22 following Charging Charts
(Fig. 4 - 7) in these instructions.
Field Control Wiring — Install a Carrier-approved
accessory thermostat assembly according to installation
instructions provided by thermostat manufaeturer.
Locate thermostat assembly on a solid wall in the condi­
tioned space to sense average room temperature.
Using thermostat cable or equivalent single leads of
No. 18 AWG colored wire, route cable or wire from
the subbase terminals, up and through connector on unit
side (below power lead junction box) and connect to low-
voltage terminal block inside the control box.
Thermostat Wire — Use 18 gage for 0- to 50-ft long
wires and 16 gage for 51- to 75-ft wire lengths.