Carrier 48DH - Manual (Page 5)

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Drain Piping — The condensate drain connection
(3/4-in. MPT) is on sei'vice access face of unit (Fig.
1). Since drain is on the suction side of the indoor
(evaporator) fan, it must be trapped to prevent
leakage back into the unit. Trap should be at least
3 in. deep and should be formed of flexible
material or in such a manner as to resist freeze-up
damage.
Wiring — The design center voltage for each unit is
stamped on the unit nameplate. The supply voltage
at the unit must be within ±10% of nameplate
voltage (see Table 4). Phase unbalance on 3-phase
units must be within 2%. Contact local power
company if correction is necessary. Operation of
the unit on improper line voltage or with excessive
phase unbalance is considered abuse and is not
covered by Carrier warranty.
Provide a branch circuit fused disconnect of
adequate size to handle unit starting current (Table
4). Disconnect must be within sight of and readily
accessible from the unit in accordance with Section
440-14 of the National Electrical Code (NEC).
Provision for locking switch at open (off) position
is advisable to prevent power from being turned on
while unit is being serviced.
Use only UL approved aluminum-copper con­
nectors if aluminum power wires are used.
UNIT CONNECTION
1. Attach field power conduit to 1-1/8 in. hole at
front of high-voltage (line wiring) junction box
(Fig. 1).
2. Run conduit so that control box can swing to
horizontal position for access to blower com­
partment (Fig. 6).
3. Splice field power wires to the pigtail leads in
the junction box. Wire nuts are provided for
either copper or aluminum wire. These must be
field insulated.
4. Route the control-voltage field wiring thru the
7/8-in. hole at front of low-voltage junction
box (Fig. 1). If conduit is not used, protect
wires by inserting diaphragm grommet into the
hole. Make all connections to pigtail leads, but
do not use aluminum control wire for splice
connection to the copper pigtails.
Accessory Installation and Wiring
REMOTE CONTROL CENTER ^ The installation
instructions for this combination heating-cooling
thermostat and subbase are included with the
accessory.
Locate the thermostat on an inside wall or
column where it is affected only by the average
temperature of the room. The subbase has slots for
direct mounting on wall or on vertical outlet box.
Run the thermostat cable or equivalent single
leads of no. 18 colored wire from subbase termi­
nals to 7/8-in. diam hole in access side of unit (Fig.
1) and attach to low voltage (control wiring)
terminals injunction box (Fig. 5 and 6).
THERMOSTAT COMBINATIONS FOR ALL UNITS
HH07AT074 AND SUBBASE HH93AZ076
HHOIA0042 AND SUBBASE HH93AZ042
HH0IAD040 AND SUBBASE HH93AZ042
FIELD
CONTRC
WIRES
POWERS -
riF-
----- RED
0—
----- BLU
BLK
L ie -
----- ORN
rk3_
L2
1
BLU
002 UNITS ONLY
BLK
YEL*'
RED
BRN I BLK
BLU ORN
LMPÍIÍ)
BLU —
— BLK -
-YEL^t.
I I I I I
I I I I I I I I
И ' И '
И ¿1 " w ' i М й ' s ™"''"
FIELD CONTROL
WIRES
003,004, 045,005 UN ITS
I I Thermostat Connections
Splice Connection
___ Field Power Wiring
_____ Field Control Wiring
_____ Factory Wiring
'Not connected when single-phase power input is used
Fig. 5 — Remote Control Wiring
for Thermostat Combinations
When thennostat wiring is complete, mount
thermostat to subbase per instructions included
with the control. Do not turn on unit power at this
time; refer to Start-Up section of this publication.
Thermostat heat anticipator setting is 0.6 amps
for natural gas units and 0.4 amps for LP gas units.
^ START CAPACITOR RELAY PACKAGE - This
accessory is available for those units requiring
boost start; see Check Compressor Start in this
publication. Installation instructions are included
with the accessory.
^ LP CONVERSION KIT - This accessory kit
contains the required components and instructions
for converting natural gas units to non-purge type
LP units.
HIGH CFM BLOWER PACKAGE is available when
500 cfm per ton cooling capacity is required. Refer
to price pages.
LOW AMBIENT 32LT FAN SPEED CONTROL
PACKAGE available for cooling operation down to
-20 F.
INDOOR FAN RELAY PACKAGE available for
size 002 units.