Daikin MPS035 F - Ignition Control Module for Modulating Gas Furnace (240 MBH Furnace Only)

Ignition Control Module for Modulating Gas Furnace (240 MBH Furnace Only)
Figure 29: Typical Modulating Gas Furnace Electrical Schematic with Sensor
Variable Furnace Controller
Daikin's furnace controller is an electronic device that delivers
full control of the modulating furnace. Control includes
sequencing, ignition, safety, modulation of the control valve,
and the induced draft motor. Inputs to the furnace control board
are an a 0-10V signal. The analog signal will modulate the
burner down to 25% of full load. Safety inputs include pressure
line and electrical connection from the airow proong switch
and electrical connection from the rollout switches. Control
board outputs are to the igniter board, modulating gas valve,
and to the induce draft motor.
Ignition Control Module LED
Diagnostics
The LED indicators (Table 20) can be used to diagnose faults
associated with the modulating gas furnace.
Table 20: LED Indicator and Fault Conditions
Indicator Fault Condition
Steady Off
No power or control hardware fault Indicator Fault
Condition
Steady On Control fault detected or no 24 VAC power
1 Flash Combustion fan motor energized, pressure switch open
2 Flashes
Inducer air pressure reads above zero level when the
inducer is off
3 Flashes
Flame is on when is should be off or ame is off when it
should be on
4 Flashes
Gas valve is on when is should be off or gas valve is off
when it should be on
5 Flashes
Safety relay is on when it should be off or safety relay is off
when it should be on
6 Flashes Excessive plenum temperature
7 Flashes High limit switch is open or fuse is open
8 Flashes
Pressure switch failed to operate or modulation current is
incorrect
Slow Flash Normal operation - no call for heat
1 Slow Flash Call for heat
2 Slow Flashes Gas on - call for heat
3 Slow Flashes Gas on - no call for heat
Rapid Flash Retry
40VA
24VAC
115VAC
Neutral
Ground
120VAC
T1 T3
T6
T9
T7
T5
T4
T2
M
Neutral
Hot
Hot
Neutral
Variable
Inducer
Inducer HSI
Flame
Flame Sensor
24VAC
115VAC
Spark Electrode
W
R
+
-
J4
J8
+
-
J9
J3
ROS1
APS
ROS2
Sensing hose
to fan
-
+
Pressure
Transducer
J5
Modulating
Gas Valve
24VAC
GND
MOD
RTN
MOD
MV
RTN
MV
Combustion
Board
Limit
Press
Switch
DSI
Board
L1 L2
0-10VDC
0-10VDC
input signal
Comm Port
MJ
Status
LED
WHT
BLK
WHT
BLU
RED
WHT
GRY
ORG
ORG
WHT
BLK
WHT
WHT
BLK
WHT
BLK
GRN
WHT
BLK
Gnd
GRY
RED
BLU
BRN
RED
1/4" Quick Connect Terminal
Terminal Block
APS Airflow Proving Switch
ROS1 Roll Out Switch #1
ROS2 Roll Out Switch #2
oPTIonal Gas heaT
www.DaikinApplied.com 35 IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS