Electric Heat - Daikin Maverick I Installation And Maintenance Manual

Sequence of Operation
is open. The blower and inducers will remain energized as long
as the limit is open and there is a call for heat.
If the call for heat goes away while the limit switch is open,
the induced draft motor will run through post purge and the
indoor blower will run through the heat fan off delay. The
status LED will return to steady on.
If the limit switch re-closes and the call for heat remains, the
status LED will return to steady on and the IFC will begin a
pre-purge time with high gas output energized to begin a re-
ignition attempt. The indoor blower remains on (for the delay
off time) through the re-ignition attempt.
Open Rollout switch
The rollout switch is ignored unless a call for heat is present and
the limit switch is closed. If the rollout switch opens for more
than 1 second, the indoor fan is energized on heat speed for a
heat blower off delay period and the inducer motor is energized
for a post-purge time period. The gas valve is de-energized if it
was energized. The status LED will flash 5 times indicating the
rollout switch is open and the IFC is in lockout.
If the rollout switch re-closes before the call for heat goes away,
the IFC will remain in lockout with the LED flashes 5 times.
Note: Rollout switch open for less than 1 second will cause
interrupted heat cycle from open PS, however it will not
lock out.
Pressure switch
The pressure switches are ignored unless a call for heat is
present and the limit and rollout switches are closed. When a
call for heat occurs and either pressure switch is closed before
the inducer is energized, the inducer will remain off and the
LED will flash 2 times until both pressure switches open.
If either pressure switch opens before the ignition period, both
induced draft motor will remain on, the high gas output will be
de-energized, and the LED will flash 2 times. When both
pressure switches are closed, the LED flash code is cleared, the
high gas output is energized, and the control re-starts the pre-
purge period.
If the low pressure switch opens after the gas valve has been
energized, the control will de-energize both gas outputs and run
the indoor blower on heat speed through the fan off delay. The
low inducer remains energized and the high inducer energizes if it
was not already energized. When both pressure switches re-close,
the control begins the pre-purge period and re-ignites. If the call
for heat goes away before the pressure switches close, both
inducer motors are de-energized and the control goes to standby.
If the high pressure switch opens while in high heat and the
low pressure switch remains closed, the control de-energizes
the high gas output and attempts to reestablish high heat.
Call for Fan
When the DDC Controller calls for continuous fan (Cont Fan)
without a call for heat, the indoor fan is immediately
energized. The fan remains energized as long as the call for fan
14
remains without a call for heat.
The continuous fan operation continues to function while the
control is in heat mode lockout.
Undesired Flame
If flame is sensed longer than 2 seconds while the gas valve is
de-energized, the IFC will energize both induced draft motors
and indoor blower motor. When flame is no longer sensed, the
induced draft motors and indoor blower motor will de-
energize. The IFC will do a soft lockout, but will still respond
to open limit and flame. The status LED will flash 4 times
when lockout is due to undesired flame. If there is no call for
heat, or the call for heat is removed, lockout will reset.
Gas Valve relay fault
If the IFC senses the gas valve is energized for more than 1
second when the control is not attempting to energize the gas
valve, or if the gas valve is sensed as not energized when it is
supposed to be energized, then the IFC will lockout with the
LED off. The IFC assumes either the contacts of the relay
driving the gas valve have welded shut, or the sensing circuit
has failed. The inducer is forced off to open the pressure
switch to stop gas flow unless flame is present.
If the gas valve was sensed as closed when it should be open,
and has not de-energized after the inducer was shut off for 15
seconds, then both inducers are re-energized to vent the
unburned gas.
Soft Lockout
The IFC shall not initiate a call for heat while in lockout. A
call for continuous fan operates as normal. The IFC will still
respond to an open limit and undesired flame.
Lockout shall automatically reset after 1 hour. Lockout may be
manually reset by removing the thermostat call for heat for
more than 3 seconds or removing power from the control for
more than 5 seconds.
Hard lockout
If the IFC detects a fault, the status LED will be de energized
and the IFC will lockout as long as the fault remains. Hard
lockout may be reset by removing power to the control for
more than 5 seconds. Faults detected within the
microcontroller continually re-test to see if they are hard
failures. Failures detected within the flame sensor or gas valve
drive circuits re-test every 1 hour.

Electric Heat

The DDC Controller will always consider two available stages
of electric heat, although installation may have only one.
The electric heat is energized whenever the demand for heat is
not satisfied. The heat source it will be staged on based on
demand.
During electric heat operation the control does not delay
energizing the indoor fan.
McQuay OM 1077