Testing Ignition Control Module - Daikin DBG Series Service Instructions Manual

SERVICING
Use LPKT180300A propane conversion kit for propane con-
versions at altitudes below 2000 feet. Natural gas installations
below 2000 feet do not require a kit.
For propane conversions above 2000 feet, high altitude kit
HAKT36300 is required in addition to LPKT180300A propane
conversion kit.
NATURAL GAS AND LP GAS INSTALLATIONS AT ALTITUDES > 2000 FT.
HIGH
INPUT/BURNER ALTITUDE
KIT
U.S.
HAKT36300 35/53 36/53 36/53
BURNER ORIFICE
CANADA
HAKT36300 35/53
BURNER ORIFICE
HIGH
INPUT/BURNER ALTITUDE
KIT
U.S.
HAKT36300 29/48 30/48 30/49
BURNER ORIFICE
CANADA
HAKT36300 29/48
BURNER ORIFICE
S-313 TESTING IGNITION CONTROL MODULE
NOTE: Failure to earth ground the unit, reversing the neutral
and hot wire connection to the line (polarity), or a high resis-
tance connection in the ground or neutral lines may cause
the control to lockout due to failure to detect flame.
The ground wire must run from the unit all the way back to
the electrical panel. Proper grounding can be confirmed by
disconnecting the electrical power and measuring resistance
between the neutral (white) connection and the burner closest
to the flame sensor. Resistance should be less than 10 ohms.
DSI Direct Spark Ignition Systems
NORMAL SEQUENCE OF OPERATION (DSI Direct Spark
Ignition System)
1. Thermostat calls for heat by energizing "W". The control
checks the pressure switch for open condition. If the
pressure switch is closed the control will flash code "3"
and wait for the pressure switch to open.
2. The induced draft motor is energized and the control flashes
code "2" and waits for the pressure switch to close. Once
the pressure switch is closed, the LED stops flashing and
the control begins timing the 15 second pre-purge.
48
35,000 BTUH NAT/33,000 BTUH/L.P.
ELEVATION ABOVE SEA-LEVEL (FEET)
2000 3000 4000 4500 5000 6000
- 37/53 37/53 38/53 39/54
- - 39/54 - -
50,000 BTUH NAT/45,000 BTUH/L.P.
ELEVATION ABOVE SEA-LEVEL (FEET)
2000 3000 4000 4500 5000 6000
- 30/49 30/49 31/50 31/50
- - 31/50 - -
L2 L2
COOL HEAT
7000 8000
- -
7000 8000
3. The control energizes the spark igniter and gas valve for
7 seconds. If flame is established, the control goes into
- -
a 30 second heat on delay.
4. The indoor blower is energized at the heat speed after a
30 second on delay.
5. The control monitors the safety circuit inputs, flame, and
thermostat during operation.
6. When the thermostat is satisfied, the gas valve is de-en-
ergized and the induced draft blower remains on for a 29
second post purge. The indoor blower remains on for the
selected heat blower off delay (90, 120, or 150 seconds).
Indoor blower off timing begins when thermostat call for
heat ends.
Testing Direct Spark Ignition (DSI) systems
Thermostat calling for heat (15 second prepurge time and 7
second trial for ignition).
1. Check for 230 VAC from L1 terminal of control module to
L2. No voltage - check wire connections, continuity, etc.
2. Check for 24 VAC at "R" to "C" thermostat terminals.
a. No voltage - check 3 amp automotive type fuse on
control board. A blown fuse would indicate a short
in the 24 VAC circuit (thermostat or limit circuit).
b. Voltage Present - check limit, auxiliary limit and
rollout (S-300, S-301 and S-302). If limit, auxiliary
limit and rollout are closed, then check for 24 VAC
at the gas valve terminals.
No 24 VAC at gas valve - replace Control board.
L2 L2
1
3 2
5 4
6
8
9 7
FS
L1 D1
UNUSED L1
12 11 10
DSI Control Board
Blower Off Delay Settings
speed up
Transformer