Service manual

ManualsBrandsEngineered air ManualsHeaterDG series

A DJM3.2 MANUAL

VI. SYSTEM TIMINGS

Pre-purge seconds 45

Maintained purge

DAY = 4 minutes, NIGHT = 1 minute

Blower start delay

Damper open time = 30 seconds

Burner warm up time

30 seconds

Burner cool down time

1 minute

Heat exchanger cool down time

1 minute nominal

Auto Low limit Bypass (from blower start)

5 minutes

Also resets on change to day or night

5 minutes

L/L trip timer activates for 30 seconds

before lockout

(NOTE: L/L is activated by dipswitch 8.)

Flame fail

90 seconds

VII. DIPSWITCHES

The DJM3.2 has a bank of eight dipswitches. The dipswitches are numbered on the drawing at the

beginning of this manual and are used for the following purposes:

Switches

1. Voltage or current reset of the discharge temperature.

2. Ambient reset of the discharge temperature.

3. Room reset of the discharge temperature.

4. Not used.

5. Manual service mode. Must be off except when servicing.

6. Not used.

7. Maintains Combustion Fan in constant purge mode if "ON". If in night mode, S/A fan is also on

constantly.

8. Activates low limit - "OFF" no low limit operation,

- "ON" low limit is operational.

Switches 1, 2, and 3 choose which of the possible reset styles is in use on the DJM3.2. If all these

switches are "OFF", the DJM3 operates strictly as a discharge control (even if a reset device is wired to the

control). Also note if a switch is "ON" for a reset that is not wired, then the DJM3.2 assumes the full reset

downward of the device. It is essential to recognize on new installations where a BMS reset signal

(supplied by others) was proposed but is not operational yet.

NOTE: When “Service Switch” is ‘ON’, the “FS” terminal has to be made before service

mode will work. If FS is off, service mode won’t work.

VIII. POTS

The DJM3.2 has 8 adjustable pots. These pots are listed below by location (terminal number the pot is

closest to), application, and the reference page number that covers adjustment procedures. Do not

adjust any pot without fully reading the correct adjustment procedure for that pot.

Page 5 Revised: 3/11/99