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hot gas into the outdoor coil where its heat melts the frost and
loosens the ice on the coil face.
During the Defrost cycle, output EHEAT is also energized (if
not already energized by a thermostat W2 demand); supple-
mental heater will be energized. During the Defrost Cycle,
LED1 on the DFB will be illuminated. The Defrost cycle ends
when DFT opens (as liquid temperature exiting the coil rises
above DFT setpoint) or the defrost cycle runs for 10 minutes.
Output at EHEAT is removed; supplemental heater will be de-
energized (unless thermostat has a W2 demand). Output at OF
is restored; outdoor fans start again. Output P3-7 (RVS1) is re-
moved; reversing valve returns to Heating position.
Defrost cycle is fixed at a maximum 10 minute duration limit.
The period to test and initiate a Defrost cycle can be configured
for 30, 60, 90 or 120 minutes.
SUPPLEMENTAL HEAT/EMERGENCY HEAT
Supplemental heat type is determined by 524F***H indoor
unit options and accessories. This heat is initiated when the in-
door unit W2 terminal is energized by the thermostat. (Or as
detailed in "Defrost Cycle" above.) The thermostat may ener-
gize W2 as supplemental (second stage) heat at higher space
heating demand, or when selected as emergency heat mode.
When the space heating demand decreases below the second
stage limit, or emergency heat is turned off, W2 is de-
energized, and supplemental heat is turned off.
COOLING AND HEATING SHUTDOWN
Partial or complete cooling or heating functions may shutdown
caused by loss of main power, open pressure switches, diag-
nostic alarms, or open internal compressor protections. See
Service section for further details.
ROUTINE SYSTEM 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)
INDOOR SECTION
•
Coil cleanliness checked.
•
Return air filter replacement
•
Belt tension checked
•
Belt condition checked
•
Pulley alignment checked
•
Fan shaft bearing locking collar tightness checked
•
Condensate drain checked
•
Blower motor amperage
OUTDOOR SECTION
•
Fan motor mounting bolts tightness
•
Compressor mounting bolts
•
Fan blade positioning
•
Control box cleanliness and wiring condition
•
Wire terminal tightness
•
Refrigerant charge level
ECONOMIZER OR OUTSIDE AIR DAMPER
•
Inlet filters condition
•
Check damper travel (economizer)
•
Check gear and dampers for debris and dirt
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)
INDOOR SECTION
•
Condenser coil cleanliness checked.
•
Return air filter replacement
•
Outdoor hood inlet filters cleaned
•
Fan shaft bearing locking collar tightness checked
•
Condensate drain checked
Heating
•
Power wire connections
•
Fuses ready
•
Manual-reset limit switch is closed
See Tables 12 and 13 for unit specific maintenance checklists.
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
•
Refrigerant charge level
•
Evaporator coil cleaning
•
Evaporator blower motor amperage
Table 12 — Outdoor Unit Maintenance Checklist
MAINTENANCE CHECKLIST
Outdoor unit specific:
Clear away debris and vegetation near unit.
Inspect cabinet for damage. Replace
components that are damaged or severely
rusted.
Inspect electrical disconnect for proper
function. Repair or replace as necessary.
Inspect electrical wiring and connections.
Tighten loose connections. Inspect and
perform functional test of equipment as
needed to ensure proper function. Repair or
replace damaged or overheated components
and wiring.
Check refrigerant system subcooling and
superheat.
Inspect inside of unit. Clean if debris is
present.
Inspect condenser coil. Clean if dust, dirt, or
debris is present. Rinse unit with fresh
water.
c
Inspect motor and fan for damage. Make
sure fans spin freely.
NOTE(S):
a. The above list may not include all maintenance items. Inspection intervals may
vary depending on climate and opening hours. Consult your Bryant dealer
about a service contact for seasonal inspections.
b. Monthly maintenance items and outdoor unit rinsing may be performed by the
customer. All other maintenance items and all service work must be performed
by a qualified service technician. Read all warning labels.
c. Do not use harsh chemicals or high pressure water on coils. More frequent rins-
ing is required near a sea coast.
d. Monthly rinsing of the condenser coil is recommended if the unit is located in a
corrosive climate.
23
RECOMMENDED
a
INTERVAL
b
Monthly
Annual
X
X
X
X
X
X
X
d
X
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