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DPS 003–015 Sequence of Operation
DANGER
Never test for gas leaks with an open flame.
It can cause an
explosion or fire resulting in property damage, personal injury, or death. Use
a commercially available soap solution made specifically for the detection of
leaks to check all connections.
WARNING
This unit is equipped at the factory for use with natural gas only. Conversion
to LP gas requires a special kit supplies by Daikin Parts. Failure to use
the proper conversion kit can cause fire, carbon monoxide poisoning,
explosion, personal injury, property damage, or death.
Staged Control
The following details the sequence of operation for the low
heat option.
1 .
Unit DDC control calls for heat.
2 .
Furnace DDC control module receives a call for heat.
3 .
High limit switch is checked for safe condition.
4 .
Proof of airflow switch is check for combustion airflow.
5 .
60 second prepurge cycle starts.
6 .
Spark ignitor is activated for 3 seconds.
7 .
Gas valve receives a command for stage 1 of heat.
8. Burner is ignited.
9 .
Unit DDC controller calls for stage 2 of heat.
10. Furnace DDC controller receives a stage 2 heat
command.
11 .
Gas valve receives a command for stage 2 of heat.
Modulating Control
The following details the sequence of operation for the low
heat option.
1 .
Unit DDC controller calls for heat.
2 .
Furnace DDC control module receives a call for heat.
3 .
Furnace safety switches and DDC control are checked
for safe conditions.
4 .
45 second prepurge cycle starts. Proof of airflow switch
is checked for combustion airflows.
5 .
Spark ignitor is activated.
6 .
Gas valve receives a signal to open fully.
7 .
Burner is ignited and runs for 20 seconds in high fire.
Note: if call for heat is interrupted during this timing, the
furnace will be locked in for the 20 seconds cycle.
8. Gas valve and induction blower motor receives a signal
to modulate burner output to match the unit discharge air
temperature setting.
LP Conversion
For Rebel A and B Cabinets Only
Convert the furnace in this unit using the liquefied petroleum
(LP) gas valve spring and burner nozzles supplied in the
for part numbers .
The LP gas valve maintains the proper manifold pressure for
LP gas. See
. The correct burner orifices are included
in the kit.
NOTE:
For units built before February 2020, use kits
in
Table 20 .
For units built between February -
August 2020, consult factory with serial number
.
For units built after August 2020, use kits in
21 .
Table 20: Furnace Identification for LP Conversion - units
built before Feb. 2020
Unit Size
Staged Furnace
3 – 6 Ton Unit
300049725
7 – 15 Ton Unit
300049583
Table 21: Furnace Identification for LP Conversion - units
built after Aug. 2020
Unit Size
Staged Furnace
3 – 6 Ton Unit
404231241
7 – 15 Ton Unit
404225351
Furnace Size (Input MBH)
5:1 Modulating Furnace
80
404231242
120
404231239
160
404231240
200
404225352
300
404225354
400
404225356
Furnace Size (Input MBH)
10:1 Modulating Furnace
200
404225353
300
404225355
400
404225357
IM-1125-13 • REBEL ROOFTOPS
56
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Optional Gas Heat