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Specifications are subject to change without notice.
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 E HEAT i s removed;
supplemental he ater wil l be de-energized (unless
thermostat has a W2 demand). Output at OF is restored;
outdoor fans start aga in. 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
configure d for 30, 60, 90 or 120 minutes.
Supplemental Heat/Emergency Heat —
Supplemental heat type is determined by FHS indoor unit
options and accessories. This heat is initiated when the
indoor unit W2 termi nal 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 MAI NTENANCE
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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