Carrier 50AH024-060 - Manual (Page 6)

START-UP
Unit Preparation — Make sure unit has been installed
in accordance with installation instructions and appli­
cable codes.
Compressor Mounting — Compressors are in­
ternally spring mounted. Do not loosen or remove
compressor holddown bolts.
Internal Wiring — Check all electrical connections in
unit control boxes. . .tighten as required.
Refrigerant Service Valves — Eaeh unit system
has 3 Schrader type service ports, one on the suction line,
one on the compressor discharge line and one for low-
ambient damper kit. Be sure that caps on the ports are
tight.
Crankcase Heater(s) are energized as long as there
is power to the unit. Energize heater(s) 24 hours prior
to base unit start-up.
Cooling — To start unit, turn on main power supply.
Set system selector switch at COOL and fan switch at
AUTO. Adjust thermostat to a setting below room
temperature. Compressor starts on closure of contactor.
Check cooling effects at a setting above room tempera­
ture. Check unit charge. Refer to Fig. 4 through 7 for
Charging Chart information.
TO SHUT OFF UNIT — Set system selector switch at
OFF position or reset thermostat at a position above
room temperature. Units are equipped with Signal-LOC™
proteetion device. Unit shuts down on any safety trip, and
indicator light on thermostat comes on. Check reason
for safety trip.
Compressor restart is accomplished by manual reset
at the thermostat by turning the selector switch to OFF
and then to ON.
SERVICE
ELECTRIC SHOCK HAZARD
Open all remote disconnects before
servicing this equipment.
Filters are cleanable and should be inspected and
cleaned at regular intervals. They are located in front of
the evaporator coil and may be removed by sliding them
horizontally out to edge of unit. See Fig. 1 and 2. No tools
are required for installation or removal of filters.
Condenser Coil is accessible through the bottom
aecess door marked condenser seetion, or through side
access panel on condenser section. Use a stiff brush
when cleaning coil.
Connect the condenser washdown pan drain connec­
tion (3/4-in. FPT) to the building drain using a 3/4-in.
MPT hose. Entering through unit bottom condenser
aceess door, use a water hose or other suitable equipment
to flush out dirt and wash down coil. Be careful not to
force water spillage out of condenser washdown pan.
Evaporator Coil is accessible for cleaning through the
bottom aecess door marked “Evaporator Section.” When
necessary, wash coil with a commercial cleaner (Oakite
164) or dishwasher detergent using a pressurized spray
canister. Flush coil from return air duct side and take
care not to get water in ductwork or unit insulation.
Condensate Drain — Clear and empty drain pan at
least once a year to prevent sludge buildup.
Lubrication of the eondenser and evaporator motors
is not necessary since both are equipped with permanently
lubricated bearings.
Do not oil.
Motor Speed Adjustment — The evaporator
motors are all direct drive, single speed and require
no adjustment.
Unit 50AH024 — Condenser motor is direct drive,
single speed.
Units 50AH036.048 and 060 — All contain belt-
driven adjustable pulley fan systems. All unit fan motors
are shipped with adjustable pulley 5 turns open and can
be adjusted to increase fan speed.
In-space servicing is recommended for the evaporator
and condenser blowers. Both are removed by loosening
and removing the 4 screws that hold them in place. In
both cases, the entire assembly is then moved outside
of base unit. Once outside, the blower wheel and con­
denser shaft bearings and/or evaporator motor can be
serviced.
IMPORTANT: If repairs to refrigerant cycle com­
ponents (e.g., compressor, filter drier, etc.) are
required, base unit must be removed from the space.
Control Box Side Access Cover Panel is held in
place with 1/4-in. self-retaining fasteners. When these
fasteners are pulled, the access panel can be turned
around 180 degrees so that its metal lip will mate up with
the metal lip on bottom of unit. This enables the access
panel cover to hang down which exposes the base unit
wiring diagram and enables the service person to work
more freely.
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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obiigations.
Book|2 |4 PC111 Catalog No 565-040 PrintedinUSA Form50AH-2SI Pg 6 6-87 Replaces: 50AH-1SI
For replacement items use Carrier Specified Parts. Tab |2al7b