Carrier 50AH024 Installation, Start-Up And Service Instructions Manual page 4

Step 6 •— Install Ductwork
— Use flexible duct¬
work to attach duct to unit and to help control transmission
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 build¬
ing, install a field-supplied rainhood. Hood intake dimen¬
sions should be same as condenser return-air dimensions.
In addition, install a triple-layer bird screen over rainhood
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 (NEC) and all local code
requirements.
Operating voltage to compressor must be within voltage
range as indicated on unit nameplate. On 3-phase units, volt¬
ages between phases must be balanced within 2% and cur¬
rent must be balanced within 10%. Contact local power
company for correction of improper voltage or phase im¬
balance. 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 op¬
eration would invalidate any applicable Carrier warranty.
Install a fused disconnect per NEC on the 5-ton (060)
230-1-60 unit. Refer to unit nameplate and Table 2 for fuse
sizes and wire amperages for all units.
NOTE: For split systems, 8 suspension rods are required.
Refer to Splitting Systems section below.
Splitting Systems
— The 50AH roomtop units may
be split into 2 sections, if desired, with condensing section
mounted remotely either horizontally or vertically. If sec¬
tions are installed in same horizontal plane they may be
separated by up to 50 equivalent ft of tubing.
Condensing section must be located in same plane as, or
above, evaporator section to maintain the liquid refrigerant
seal at the expansion device. This permits expansion device
to feed liquid refrigerant to evaporator coil properly. To
split sections (some of the following steps may be elimi¬
nated 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. Reclaim the refrigerant from the system using both the
high- and low-pressure ports.
5. Cut refrigerant piping in the evaporator section just in¬
side 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 condenser-fan motor wiring at the partitions sepa¬
rating condenser and evaporator sections.
8. In the condenser section, install a junction hox adja¬
cent to the D-shaped grommet.
9. Install evaporator and condensing sections in desired
locations. Refer to Steps 10-12 below.
10. Use appropriate length of no. 16 American Wire Gage
(AWG) (minimum), 4/64-in. insulated copper wire to
reconnect cut condenser-fan motor wires. Make con¬
nections in junction boxes installed in earlier steps.
Follow all applicable electrical codes.
11. Use sufficient length of refrigeration piping to recon¬
nect piping cut in previous step. Refer to Carrier Sys¬
tem Design Manual, Part 3, for additional piping data.
12. Replace top panels on each section.
Table 2 — Electrical Data
UNIT
50AH
V-PH (60 Hz)
VOLTAGE RANGE
Min
Max
024 230-1 207
254
230-1
207 254
036 208/230-3 187 254
460-3 414
508
230-1
207 254
048
208/230-3 187 254
460-3 414
508
575-3 518 632
048*
208/230-3 187
254
460-3 414
508
230-1 207
254
060
208/230-3 187
254
460-3 414
508
575-3 518 632
060*
208/230-3 187 254
460-3 414 508
COMPRESSOR
LEGEND
HACR
— Heating, Air Conditioning, and Refrigeration
Hp
— Horsepower
FLA
— Full Load Amps
LRA
— Locked Rotor Amps
MOCP
— Maximum Overcurrent Protection (HACR breaker)
RLA
— Rated Load Amps
*Special order evaporator-fan motor nameplate data.
| FAN MOTORS
POWER
| Evaporator Condenser
Min Ckt
Hp FLA Hp FLA
Amps
.33 1.32 .50 3.40 19.1
50 3.20 75 6.06
29.5
50 3 20 1 0 3 93 19.9
50 1.50 1 0 1.97 8.8
75 40 1 0 8.35 42 0
75 40 1 0 3 93 24 8
75 2 15 1 0 1 97 134
75 1 40 1 0
1 45
10 1
1 5 56 1 0 3 93 26 4
1.5 28 1 0 1 97 140
75 40 1 5 9 50 49 5
75
40
1 5 4 82 30 4
.75 2 15
1.5 2 41 158
75 1.40 1 5 1 90 122
1 5
56 1 5
4 82 32.0
1 5 28
1 5
2 41 16.5
4