Carrier 48TJ016-028 - Manual (Page 16)

MOTORMASTER® V CONTROL INSTALLATION
(48TJ024,028 UNITS)
Install Lield-Fabricated Wind Baffles — Wind baffles must
be field-fabricated for all units to ensure proper cooling cycle
operation at low ambient temperatures. See Fig. 21 for baffle
details. Use 20-gage, galvanized sheet metal, or similar
coito -
sion-resistant metal for baffles. Use field-supplied screws to at­
tach baffles to unit. Screws should be ‘A-in. diameter and
5/s-in. long. Drill required screw holes for mounting baffles.
A 0j|^||Y|Q||
To avoid dmnage to the refrigerant coils and electrical com­
ponents, use recommended screw sizes only. Use cru'e
when diilling holes.
FR<3M FUSE BLOCK
Install Motormaster V Controls — Tlie Motormaster V
(MMV) control is a motor speed control device which adjusts
condenser fan motor speed in response to declining liquid re­
frigerant pressure. A properly applied Motormaster V control
extends the operating range of air-conditioning systems and
permits operation at lower outdoor ambient temperatures.
Tlie minimum iunbient temperatures at which the unit will
operate are:
TEMPERATURE OPERATING LIMÌTS — F°
standard Unit with Unit with
Unit Low Ambient Kit MMV Control
40 25 -20
To operate down to the ambient temperatures listed,
Motomiaster V controls (Fig. 23) must be added. Field-fabricat­
ed and installed wind baffles iu'e also required for iill units (see
Fig. 21). The Motormaster V control permits operation of the
unit to an ambient temperature of-20 F. Tlie control regulates the
speed of 3-phase fan motors that aie compatible with the control.
Tliese motors are factoiy installed.
See Table 6 for the Motormaster V control accessoiy pack­
age usage. Table 7 shows applicable voltages and motors.
Replacement of motor or fan blade IS NOT REQUIRED ON
CURRENT PRODUCTION UNITS since the control is
compatible with the factoiy-installed fan motors. Only field
wiring control is required
Install the Motormaster V control per instiuctions supplied
with accessoiy.
Ó O Ò O Ó
TO PRESSURE^
TRANSDUCER
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IflrtDfVÌÓnrTnhDnrvnfìDITri
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Fig. 23
TO MOTOR(S)
Motormaster V Control
Table 6 — Motormaster V Control Package Usage
UNIT VOLTAGE ITEM DESCRIPTION
208/230 CRLOWAIVIB015A00
48TJ024,028 460 CRLOWAÌVIB016A00
575 CRLOWAW1B017A00
Table 7 — Applicable Voltages and Motors
VOLTAGE COMPATIBLE MOTOR
208/230-3-60 HD52AK654
460-3-60 HD52AK654
575-3-60 HD52GE576
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