A
DJM3
IOM-17
7 of 27 Mar 99 R3
DIP
SWITCHES
The DJM3 options are configured by DIP switch selection and/or wiring connections.
TABLE 2
DIP SW
Description
1
Enable Vdc or mA temperature reset if ON.
2
Enable ambient reset if ON.
3
Enable room/return temperature reset if ON.
4
Not used.
5
Service mode (must be left OFF for normal operation).
6
Not used.
7
Constant combustion air purge mode if ON.
8
Enable low limit discharge temperature sensing if ON
Note: The DJM3 will only accept one type temperature reset signal.
INDICATION
AND
DIAGNOSTIC
LIGHTS
There are 4 status lights on the DJM3 labeled 1 to 4. They operate in 4 patterns: constant on, 2 second
flash (on for 1 second, off for 1 second), 1 second flash (on for ½ second, off for ½ second) and an
irregular flash (flashes twice, then off, repeat).
TABLE 3
LIGHT
LED ON
2 SEC FLASH
1 SEC FLASH
INT FLASH
1
LL LOCKOUT
LL BYPASS
D SEN OPEN
‐‐‐‐‐‐‐‐‐‐
2
PRE PURGE
PP PROBLEM
‐‐‐‐‐‐‐‐‐‐
‐‐‐‐‐‐‐‐‐‐
3
HEAT CALL
HT SW OPEN
‐‐‐‐‐‐‐‐‐‐
SERVICE MODE
4
IGN ENABLE
‐‐‐‐‐‐‐‐‐‐
FLAME FAIL
‐‐‐‐‐‐‐‐‐‐
1
ON
The appliance has been shut down due to low limit failure and lockout.
(discharge temperature below 4°C (40°F)) Reset with the service switch.
Normal operating status: OFF.
1
2 SEC
Unit has low discharge temperature and is timing out. If the temperature does
not recover to above 4°C (40°F) it will shut down and lockout.
Normal operating status: OFF, or waiting for the discharge temperature to rise
above 4°C (40°F).
1
1 SEC
The discharge sensor circuit is open (sensor range must be between 880 and
4000Ω).
Normal operating status: OFF.
2
ON
The combustion blower is purging the exchanger as a preliminary to ignition.
Normal operating status: EITHER ON or OFF.
2
2 SEC
Pre Purge problem. The DJM3 is not receiving a correct signal from the hall
effect tachometer sensor, into terminals YS, OS, GS.
Normal operating status: OFF.
