Routine Maintenance - Carrier WeatherMaster Puron 48HC D17 Service And Maintenance Instructions

OUTDOOR AIR
HOOD
DISCONNECT
CONVENIENCE
OUTLET
CONTROL BOX
ACCESS PANEL
ACCESS PANEL
Fig. 1 — Access Panels and Components (Front)
CONDENSER COIL
CIRCUIT A
CONDENSER COIL
CIRCUIT B
Fig. 2 — Typical Access Panel Location (Rear)

Routine Maintenance

These items should be part of a routine maintenance program,
to be checked every month or two, until a specific schedule for
each can be identified for this installation.
QUARTERLY INSPECTION (AND 30 DAYS AFTER INI-
TIAL START)
The 48HC units should be inspected and serviced every three
months.
• Return air filter replacement
• Outdoor hood inlet filters cleaned
• Belt tension checked
• Belt condition checked
• Pulley alignment checked
• Fan shaft bearing locking collar tightness checked
• Condenser coil cleanliness checked
• Condensate drain checked
SEASONAL MAINTENANCE
These items should be checked at the beginning of each season
(or more often if local conditions and usage patterns dictate).
Air Conditioning
• Condenser fan motor mounting bolts tightness
• Compressor mounting bolts
• Condenser fan blade positioning
• Control box cleanliness and wiring condition
• Wire terminal tightness
SUPPLY FAN
OUTDOOR
HEATING SECTION
FANS/MOTORS
RETURN AIR
COMPRESSOR
FILTER AND
GAS SECTION (CIRCUIT A)
INDOOR COIL
ACCESS PANEL
COMPRESSOR
CIRCUIT B
• Refrigerant charge level
• Evaporator coil cleaning
• Evaporator blower motor amperage
Heating
• Heat exchanger flue passageways cleanliness
• Gas burner condition
• Gas manifold pressure
• Heating temperature rise
Economizer or Outside Air Damper
CONDENSER
• Inlet filters condition
COIL
(CIRCUIT A)
• Check damper travel (economizer)
• Check gear and dampers for debris and dirt
Air Filters and Screens
Each unit is equipped with return air filters. If the unit has an
economizer, it will also have an outside air screen. If a manual
outside air damper is added, an inlet air screen will also be
present.
Each of these filters and screens will need to be periodically re-
placed or cleaned.
Return Air Filters
Return air filters are disposable fiberglass media type. Access
to the filters is through the vertical panel to the right of the con-
trol box. Filters are situated on slide-out racks for easy inspec-
tion and repair. See Fig. 1.
EQUIPMENT DAMAGE HAZARD
Failure to follow this CAUTION can result in premature
wear and damage to equipment.
DO NOT OPERATE THE UNIT WITHOUT THE RE-
TURN AIR FILTERS IN PLACE.
Dirt and debris can collect on heat exchangers and coils
possibly resulting in a small fire. Dirt buildup on compo-
nents can cause excessive current used resulting in motor
failure.
Removing the Return Air Filters
1. Remove the Return Air Filter and Indoor Coil Access
Panel. See Fig. 1.
2. Reach inside and remove the filters from the filter rack.
3. Replace the filters, as required, with similar replacement
filters of the same size.
4. Re-install the Return Air Filter and Indoor Coil Access
Panel.
Outdoor Air Hood
The outdoor air hood inlet screens are permanent aluminum-
mesh type filters. See Fig. 2. Inspect these screens for cleanli-
ness. Remove the screens when cleaning is required. Clean by
washing with hot low-pressure water and soft detergent. Re-
place all screens before restarting the unit. Observe the flow di-
rection arrows on the side of each screen frame.
Economizer Inlet Air Screen
The inlet air screen is retained by filter clips under the top edge
of the hood. See Fig. 3.
Remove screens by removing the screws in the horizontal clips
on the leading edge of the hood. Slide filters out. See Fig. 3.
Install filters, by sliding clean or new filters into the hood side
retainers. Once positioned, re-install the horizontal clips.
3
CAUTION