Carrier 50HQ - Manual (Page 4)

Table 3 — Electrical Data
UNIT MODEL
50HQ,VQ
V/PH/HZ
OPERATING
VOLTAGE
COMPRESSOR FAN
FLA
MINIMUM
CIRCUIT
MAXIMUM
FUSE
AMPS AMPS Max Min LRA RLA
014 37 5 9 6 7 12.7 20
018 53 0 134 9 17.7 30
022
197
65 0 13 3 1.5 18 1 30
027
208-230/1/60 253
66 0 16 2 1 7 22 0 35
033 88 0 23 3 2 5 31.6 50
042 100 0 27 7 3 2 37 8 60
048
187
94 0 23 9 34 33 4 60
060 150 0 35,3 4.5 48.6 60
033 87 0 13 8 2 5 19 8 30
042 100 0 18 5 3 2 26 3 40
048 208-230/3/60 253 187 80 0 16 8 3 9 24 9 40
060 136 0 20 6 4 5 30 6 45
080 137 0 20 7 6 2 32 1 45
033 30 0 60 1 1 8 9 15
042 36 5 6.9 1 6 10 2 15
048 460/3/60 508 414 35 0 8 2 20 12 3 15
060 49 0 104 2 6 15 3 25
080 69 0 11 4 31 17 4 25
FLA — Full Load Amps
LRA — Locked Rotor Amps
RLA — Rated Load Amps
L
INSTALL BALANCING VALVES (with shutofO
in water supply and return lines for water flow
adjustment and a means of water shutoff, if neces­
sary, when servicing unit. When multiple units are
connected in parallel, valves permit removal of one
unit without interrupting water flow to other
units.
MAKE CONDENSATE DRAIN LINE CON­
NECTION to female pipe connection provided on
unit. Fig. 4 and 5. Install a trap in condensate line as
close as possible to unit. Trap must be at least 3 in.
deep and not higher than the bottom of unit con­
densate drain opening. Pitch condensate line to
open drain or sump. Insulate a condensate drain line
located above a living area.
50HQ Units Only — If a secondary drain is re­
quired, remove plastic cap from secondary drain
connection, located in bottom of unit, and connect
drain so that discharge is obvious to maintenance
personnel.
Step 4 — Make Electrical Connections — Field
wiring must comply with local and national fire,
safety and electrical codes. Voltage to unit must be
within the operating voltage range indicated on
nameplate or in Table 3. On 3-phase units, phases
must be balanced within 2%.
Operation of unit on improper line voltage or
with excessive phase imbalance constitutes abuse
and is not covered by Carrier Warranty.
INSTALL A BRANCH CIRCUIT DISCONNECT
PER NEC of adequate size to handle unit starting
current. Locate disconnect within sight of and
readily accessible from the unit, per Section 440-14
of National Electrical Code (NEC).
BRING POWER LEADS INTO UNIT — Extend
leads from disconnect per NEC thru hole provided
(Fig. 1 and 2) into line wiring splice box. Fig. 6.
CONNECT GROUND LEAD TO GROUND
LUG IN SPLICE BOX for safety. Connect power
wiring. See Fig. 6. Splice line power leads to yellow
and black pigtails on single-phase units or yellow
pigtails on 3-phase units. Use wire nuts. Tape each
connection.
Unit transformer on 208-230-volt units is factory
wired for 230/24-volt operation. For 208/24-volt
operation, remove black (230-v) transformer lead
from unit contactor and connect red (208-v) lead to
contactor. Cap unused transformer lead.
SET FAN MOTOR SPEED — Set fan motor for
high-, medium- or low-speed operation as follows:
1. Remove unit fan section access panel.
2. Locate Molex fan speed selector block on fan
housing. Fig. 7. Selector block receptacle 1 is
high fan speed, receptacle 2 is medium fan speed
and receptacle 3 is low fan speed. Yellow and
black fan motor power leads from control box
are connected to selector block receptacle C and
1. Yellow lead is common, black lead is speed-
change lead.
3. To change fan motor speed, remove black lead
from selector block receptacle and plug it into
desired receptacle. Receptacle 4 is not used.
CAUTION: For proper utiit operation, set unit
fan motor speed for air quantity witbin range
shown in Table 4.
Set Fan Motor Speed on 460-Volt Units — Two-
speed fan motor is factory wired for high-speed oper­
ation. (Yellow and black power leads from control
box are connected to the yellow and black fan motor
leads.) Change fan motor to low speed by wiring as
follows:
1. Splice the violet and black fan motor leads
together.