DJM2.4 MANUAL
8 Oct 00 R2
DJM2 Control
TE 6000
Discharge
Air Sensor
B
D
SP
Curve matching. (CW = Increase O2 reading)
Combustion blower minimum speed. (CW = slower)
Tachometer calibration (Factory Set for optimal light off speed
(CW=faster)
Tachometer calibration (Factory Set)
Proportional/Integral Setting (CONT Pot 3)
The DJM2.4 is a Proportional and Integral (PI) controller. This type of control system will provide
stable temperature control with little deviation from set point. However when the DJM2.4 is used
with BMS control, the host system may already have an elaborate PID control scheme which could
react with the DJM2.4 PI control scheme. In this application, the DJM2.4 can be adjusted to
provide proportional only control. Pot 3 can be adjusted to vary the effect of Proportional and
Integral control schemes. When set in the full CCW position the control effect will be 95%
proportional. When set at the full CW position, the proportional effect will be 25%. With different
applications, slightly different settings may be required. Tests have indicated the best settings for
various applications are:
For use with Maxitrol TS114 or Johnson TE 6000-960 sensors this pot should be left in the
centre position (9 o’clock or less position).
For use with a building management control system, the pot should be set in the full CCW
(proportional) position. (This includes METASYS and similar controls.)
For use with the C-TRAC, the pot should be left set in the centre position
or just slightly CCW from centre (9 o’clock or between 7:30 and 9 o’clock).
VII. HIGH FIRE OVERRIDE
The DJM2.4 has a terminal marked "OR". When terminal
"OR" is jumpered to terminal "B" the unit will go to high
fire. This is usually activated by room thermostat.
NOTE: This is a jumpered high fire condition. During this condition the DJM2.4 will
not provide temperature control. If discharge temperatures exceed the
setting of the L4064 Honeywell High Limit control (located where the supply
air leaves the heat exchanger), the high limit will trip and turn the heat off.
VIII. STATUS LIGHTS
There are 3 LED lights that have different meanings based on the rate of flashing. The different
rates are defined as:
ON (Constant)
SLOW FLASH (2 second rate)
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