Supplemental Heating/Emergency Heating; Cooling And Heating Shutdown; Routine System Maintenance; Quarterly Inspection - Bryant 575Jx08G/H Series Installation, Start-Up And Service Instructions Manual

If the outdoor coil's Defrost Thermostat switch (DFT) is
closed (shorting DFB terminals DFT1 and DFT1), the
Defrost cycle will start. Output at OF is removed; outdoor
fans stop during the Defrost cycle. Output P3–7 (RVS1) is
energized; reversing valve solenoid RVS is energized and
reversing valve changes position, placing the circuit in a
Cooling mode flow, directing 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);
supplemental 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 removed; 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 524J indoor unit
options and accessories. This heat is initiated when the
indoor unit W2 terminal is energized by the thermostat. (Or
as detailed in "Defrost Cycle" above.) The thermostat may
energize W2 as supplemental (2nd stage) heat at higher
space heating demand, or when selected as emergency heat
mode. When the space heating demand decreases below the
2nd 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, diagnostic 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
S Coil cleanliness checked.
S Return air filter replacement
S Belt tension checked
S Belt condition checked
S Pulley alignment checked
S Fan shaft bearing locking collar tightness checked
S Condensate drain checked
S Blower motor amperage
Outdoor Section
S Fan motor mounting bolts tightness
S Compressor mounting bolts
S Fan blade positioning
S Control box cleanliness and wiring condition
S Wire terminal tightness
S Refrigerant charge level
Economizer or Outside Air Damper
S Inlet filters condition
S Check damper travel (economizer)
S Check gear and dampers for debris and dirt
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