Carrier PH4G-B Series Installation Instructions Manual page 29

PH4G--B: Installation Instruction
Step 2 – Outdoor Coil, Indoor Coil, and Condensate
Drain Pan
Inspect the condenser coil, evaporator coil, and condensate drain pan at
least once each year.
The coils are easily cleaned when dry; therefore, inspect and clean the
coils either before or after each cooling season. Remove all obstructions,
including weeds and shrubs, that interfere with the airflow through the
condenser coil.
Straighten bent fins with a fin comb. If coated with dirt or lint, clean the
coils with a vacuum cleaner, using the soft brush attachment. Be careful
not to bend the fins. If coated with oil or grease, clean the coils with a
mild detergent-and-water solution. Rinse coils with clear water, using a
garden hose. Be careful not to splash water on motors, insulation, wiring,
or air filter(s). For best results, spray condenser coil fins from inside to
outside the unit. On units with an outer and inner condenser coil, be sure
to clean between the coils. Be sure to flush all dirt and debris from the
unit base.
Inspect the drain pan and condensate drain line when inspecting the
coils. Clean the drain pan and condensate drain by removing all foreign
matter from the pan. Flush the pan and drain trough with clear water. Do
not splash water on the insulation, motor, wiring, or air filter(s). If the
drain tube is restricted, clear it with a plumbers snake or similar probe
device.
Step 3 – Outdoor Fan
Keep the condenser fan free from all obstructions to ensure proper
cooling operation. Never place articles on top of the unit. Damage to unit
may result.
1. Remove 6 screws holding outdoor grille and motor to top cover.
2. Turn motor/grille assembly upside down on top cover to expose fan
blade.
3. Inspect the fan blades for cracks or bends.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
T1 - ENABLES DEFROST
TIMER.MUST BE
ENERGIZED FOR
DEFROST TIMER
TO START
C - COMMON
O - REVERSING VALVE
THERMOSTAT INPUTS
Fig. 22 – Defrost Control
OUTDOOR FAN
RELAY
DEFROST THERMOSTAT
MUST BE CLOSED BEFORE
DEFROST TIMER BEGINS
Y OUTPUT TO PRESSURE
SWITCHES AND CONTACTOR
SPEEDUP
4. If fan needs to be removed, loosen setscrew and slide fan off motor
shaft.
5. When replacing fan blade, position blade back to same position as
before.
6. Ensure that setscrew engages the flat area on the motor shaft when
tightening.
7. Replace grille.
Step 4 – Electrical Controls and Wiring
Inspect and check the electrical controls and wiring annually. Be sure to
turn off the electrical power to the unit.
Remove access panels (see
and wiring. Check all electrical connections for tightness. Tighten all
screw connections. If any discolored or burned connections are noticed,
disassemble the connection, clean all the parts, restrip the wire end and
reassemble the connection properly and securely.
After inspecting the electrical controls and wiring, replace all the panels.
Start the unit, and observe at least one complete cooling cycle to ensure
proper operation. If discrepancies are observed in operating cycle, or if a
suspected malfunction has occurred, check each electrical component
with the proper electrical instrumentation. Refer to the unit wiring label
when making these checkouts.
Step 5 – Refrigerant Circuit
Inspect all refrigerant tubing connections.
If low performance is suspected, leak-test all refrigerant tubing using an
electronic leak detector, or liquid-soap solution. If a refrigerant leak is
detected, refer to Check for Refrigerant Leaks section.
If no refrigerant leaks are found and low performance is suspected, refer
to Checking and Adjusting Refrigerant Charge section.
29
Fig. 24 to locate all the electrical controls
A150622