Daikin DPS028 - DPS 003-015 Sequence of Operation

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 airow switch is check for combustion airow.
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 airow switch
is checked for combustion airows.
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 re.
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 (Staged Furnace Only)
For Rebel A and B Cabinets Only
Convert the furnace in this unit using the liqueed petroleum
(LP) gas valve spring and burner nozzles supplied in the
conversion kit. See Table 18 for part numbers.
The LP gas valve maintains the proper manifold pressure for
LP gas. See Table 18. The correct burner orices are included
in the kit.
Table 18: Furnace Identication for LP Conversion
Unit Size Staged Furnace
3 – 6 Ton Unit 300049725
7 – 15 Ton Unit 300049583
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 Table 19 for part numbers.
Table 19: Furnace Identications for Altitude (DPS 003–015)
Elevation Part Number
Staged Operation
2000–2999 300049578
3000–3999 300049579
4000–4999 300049580
5000–5999 300049581
6000–6999 300049582
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