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Altitude Conversion
For elevations up to 2,000 feet, rating plate input ratings apply.
For high altitudes (elevations over 2,000 ft.), contact Daikin
Parts . See
for part numbers .
NOTE:
If the fuel source has been derated for altitude by
the local utility provider then a conversion kit is not
required.
NOTE:
For units built before February 2020, use kits
in
For units built between February -
August 2020, consult factory with serial number
.
For units built after August 2020, use kits in
23 .
Table 22: Furnace Identifications for Altitude - units built
before Feb. 2020
Elevation
Part Number
Staged Operation
2000–2999
300049578
3000–3999
300049579
4000–4999
300049580
5000–5999
300049581
6000–6999
300049582
Table 23: Furnace Identifications for Altitude - units built
after Aug. 2020
Elevation
Part Number
Natural Gas
2000-2999
404231250
3000-3999
404231251
4000-5999
404231252
6000-7999
404231253
8000-9999
404231254
LP Gas
2000-3999
404231245
4000-5999
404231246
6000-6999
404231247
7000-8999
404231248
9000-9999
404231249
DPS 016–028 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 limits switch(s) are checked for safe conditions.
4 .
Proof of air flow switch is checked for combustion
induced draft airflow.
5 .
30 second pre-purge cycle starts.
6 .
Spark ignitor is activated for 3 seconds.
7 .
Gas valve receives a command for stage 1 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 .
A call for heat is initiated by the rooftop unit control
through a digital Modbus signal or the analog thermostat.
2 .
The 1285 control will then go through a system check to
ensure that the high temperature limit and rollout switches
are closed, the air pressure switch is open, and the
modulating valve is positioned correctly.
3 .
The control will then enter the pre-purge cycle, where the
inducer will run at the programmed purge pressure. During
this cycle, the control will look for the air pressure switch to
close and open at the correct settings.
4 .
Once the system check and pre-purge cycles are
complete, the control will enter the ignition cycle.
A. The modulating valve and inducer will go to their “light
off” settings.
B. The DSI ignition module will be energized and the
spark ignitor will activate.
C. The redundant safety valve will open, allowing gas
flow.
Optional Gas Heat
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57
IM 1125-13 • REBEL ROOFTOPS