Carrier 38HD - Manual (Page 7)

Table 3 — Electrical Data (60 Hz)
OUTDOOR
UNIT 38HD
V/PH
OPER VOLTS* COMPR FAN
FLA
MCA
MAX FUSE
OR HACR TYPE
CKT BKR AMPS
Max Min LRA RLA
018
024
030
036
048
060
208/230-1 254 187
52 0
60.0
65 0
82 0
127 0
135 0
84
10.6
13.5
165
25 0
30.7
.70
70
70
1 45
1 45
1.45
120
140
180
22 0
33 0
40 0
15
20
30
35
50
60
036 67 5 10.0 1 45 140 20
048 208/230-3 254 187 98 5 15 4 1.45 21 0 35
060 105.0 19.6 1.45 26 0 45
036 33 8 50 80 70 15
048 460-3 506 414 49 3 77 80 11 0 15
060 55 0 104 .80 14.0 20
FLA — Full Load Amps
HACR — Heating, Air Conditioning, Refrigeration
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps per NEC Section 430-24
RLA — Rated Load Amps (compressor)
‘Permissible limits of the voitage range at which unit wiil operate
satisfactorily
NOTE; Control circuit is 24v on all units and requires external
power source
Example: Supply voltage is 460-3-60.
ABC AB = 452 volts
BC = 464 volts
AC = 455 volts
Average Voltage =
452 + 464 + 455
1371
457
Determine maximum deviation from average voltage
(AB) 457 - 452 = 5 volts
(BC) 464 - 457 = 7 volts
(AC) 457 - 455 = 2 volts
Maximum deviation is 7 volts.
Determine % voltage imbalance:
% Voltage Imbalance = 100 x
457
1.53%
This amount of phase imbalance is satisfactory as it is
below the maximum allowable 2%.
IMPORTANT: If the supply voltage phase im­
balance is more than 2% contact your local electric
utility company immediately.
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 applicable Carrier
warranty.
START-UP
Preliminary Checks
1 Check that all internal wiring connections are tight
and that all barriers, covers and panels are in place.
2. Field electrical power source must agree with unit
nameplate rating
3 All service valves must be open.
4. Crankcase heater must be tight on compressor
crankcase.
Leak Test field piping and fan coil by pressure method
described in Carrier Standard Service Techniques
Manual, Chapter 1, Section 1-6. Use R-22 at approxi­
mately 25 psig backed up with an inert gas to a total
pressure not to exceed 245 psig.
Before starting unit, crankcase heater must he on for
24 hours to he sure all refrigerant is out of the oil. To
energize crankcase heater, proceed as follows: set space
thermostat above ambient so there will be no demand for
cooling. Close field disconnect. The crankcase heater
is now energized.
Evacuate and Dehydrate field piping and fan coil
by either of the methods described in Carrier Standard
Service Techniques Manual, Chapter 1, Section 1-7.
A CAUTION
Service valves must be fully backseated to close
service port. There is no Schrader valve at the service
port and failure to backseat the valve could result in
loss of system charge or personal injury.