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50ZHK: Installation Instructions
5. Remove grease and oil with a mild solvent.
6. Reassemble
a. Slip the wheel back in the housing with the hub set screw
parented in the correct direction.
b. Install the filler panel.
c. Reinsert the motor assembly in the wheel hub and align the
mounting legs with the housing mounting hold locations.
d. Tighten the mounting bolts to fasten the motor assembly with the
housing.
e. Center the wheel in the housing by sliding it, align the flat end of
the shaft with the set screw and tighten the set screw.
f. Slide back the blower housing into the mounting rails in the duct
panel and install the mounting bracket back in its position.
g. Install the screws on the external side of the duct panel to fasten
duct panel with the housing.
h. Replace the side access panel.
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 trough is restricted, clear it with a "plumbers snake" or similar
probe device.
Outdoor Fan Adjustment
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in damage to unit components.
Keep the condenser fan free from all obstructions to ensure proper
cooling operation. Never place articles on top of unit.
1. Shut off unit power supply and install lockout tag.
2. Remove outdoor-fan assembly (grille, motor, motor cover, and fan)
by removing screws and flipping assembly onto unit top cover.
3. Inspect the fan blades for cracks or bends.
4. If fan needs to be removed, loosen the setscrew and slide the fan off
the motor shaft.
5. When replacing fan blade, position blade as shown in
Tighten setscrews.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Fig. 17 – Outdoor Fan Adjustment
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 panel to locate all the electrical controls and wiring.
Check all electrical connections for tightness. Tighten all screw
connections. If any smoky or burned connections are noticed,
disassemble the connection, clean all the parts, re-strip the wire end and
reassemble the connection properly and securely.
Check to ensure no wires are touching refrigerant tubing or sharp sheet
metal edges. Move and secure wires to isolate from tubing and sheet
metal edges.
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 checks. (See
Refrigerant Circuit
Inspect all refrigerant tubing connections and the unit base for oil
accumulation annually. Detecting oil generally indicates a refrigerant
leak.
EXPLOSION, SAFETY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could result in personal injury, death or
equipment damage.
This system uses Puron (R-410A) refrigerant which has higher
operating pressures than R-22 and other refrigerant. No other
refrigerant may be used in this system. Gauge set, hoses, and recovery
system must be designed to handle Puron (R-410A). If you are unsure,
consult the equipment manufacturer.
If oil is detected or if low cooling performance is suspected, leak test all
refrigerant tubing using an electronic leak detector, halide torch 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 cooling performance is
Fig.
17.
suspected, refer to Checking and Adjusting Refrigerant Charge section.
Indoor Airflow
The airflow does not require checking unless improper performance is
suspected. If a problem exists, be sure that all supply- and return-air
grilles are open and free from obstructions, and that the air filter is clean.
18
HP UNIT
FAN
HUB
A
MOTOR
SHAFT
Fig. 14
and
Fig.
15)
WARNING
!
A
in. (mm)
SIZE
024
13/16 (20.6)
030
13/16 (20.6)
036
0
042
1/2 (12.7)
1/2 (12.7)
048
060
1/2 (12.7)
A220716
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