3
UNIT ARRANGEMENT AND ACCESS
General
Fig. 1 and Fig. 2 show general unit arrangement and
access locations.
OUTDOOR AIR
HOOD
CONTROL BOX
ACCESS PANEL
RETURN AIR
FILTER AND
INDOOR COIL
ACCESS PANEL
SUPPLY FAN
HEATING SECTION
GAS SECTION
ACCESS PANEL
OUTDOOR
FANS/MOTORS
DISCONNECT
CONVENIENCE
OUTLET
COMPRESSOR
(CIRCUIT A)
CONDENSER
COIL
(CIRCUIT A)
C12560
Fig. 1 -- Access Panels and Components, Front
CONDENSER COIL
CIRCUIT A
CONDENSER COIL
CIRCUIT B
COMPRESSOR
CIRCUIT B
C09505
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 initial start)
The 48HC units should be inspected and serviced every
three months.
S
Return air filter replacement
S
Outdoor hood inlet filters cleaned
S
Belt tension checked
S
Belt condition checked
S
Pulley alignment checked
S
Fan shaft bearing locking collar tightness checked
S
Condenser coil cleanliness checked
S
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
S
Condenser fan motor mounting bolts tightness
S
Compressor mounting bolts
S
Condenser fan blade positioning
S
Control box cleanliness and wiring condition
S
Wire terminal tightness
S
Refrigerant charge level
S
Evaporator coil cleaning
S
Evaporator blower motor amperage
Heating
S
Heat exchanger flue passageways cleanliness
S
Gas burner condition
S
Gas manifold pressure
S
Heating temperature rise
Economizer or Outside Air Damper
S
Inlet filters condition
S
Check damper travel (economizer)
S
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 replaced 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 control box. Filters are situated on slide out
racks for easy inspection 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
RETURN AIR FILTERS IN PLACE.
Dirt and
debris on heat exchangers and coils can cause
excessive current used resulting in motor failure.
CAUTION
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.
48H
C
Summary of Contents for 48HC D17 Series
Page 77: ...77 APPENDIX IV WIRING DIAGRAMS C12616 Fig 77 48HC D17 D28 Power Diagram 208 230 3 60 48HC...
Page 78: ...78 APPENDIX IV WIRING DIAGRAMS C12617 Fig 78 48HC D17 D28 Power Diagram 460 3 60 48HC...
Page 79: ...79 APPENDIX IV WIRING DIAGRAMS C12618 Fig 79 48HC D17 D28 Power Diagram 575 3 60 48HC...
Page 86: ...86 APPENDIX IV WIRING DIAGRAMS C13767 Fig 86 RTU OPEN Wiring Diagram 48HC...
Page 87: ...87 APPENDIX IV WIRING DIAGRAMS C13768 Fig 87 RTU OPEN Wiring Diagram with Humidi MiZer 48HC...
