Dps 003-015 Sequence Of Operation - Daikin Rebel DPS Series Installation And Maintenance Manual

DPS 003–015 Sequence of Operation
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.
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.
IM-1125-13 • REBEL ROOFTOPS
DANGER
WARNING
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
conversion kit. See Table 21
The LP gas valve maintains the proper manifold pressure for
LP gas. See Table 21. 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
For units built after August 2020, use kits in
21 .
Table 20: Furnace Identification for LP Conversion - units
built before Feb. 2020
Unit Size
3 – 6 Ton Unit
7 – 15 Ton Unit
Table 21: Furnace Identification for LP Conversion - units
built after Aug. 2020
Unit Size
3 – 6 Ton Unit
7 – 15 Ton Unit
Furnace Size (Input MBH)
80
120
160
200
300
400
Furnace Size (Input MBH)
200
300
400
56
Optional Gas Heat
for part numbers .
number .
Staged Furnace
300049725
300049583
Staged Furnace
404231241
404225351
5:1 Modulating Furnace
404231242
404231239
404231240
404225352
404225354
404225356
10:1 Modulating Furnace
404225353
404225355
404225357
www.DaikinApplied.com
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