A
DJM3
IOM-17
13 of 27 Mar 99 R3
It is possible to obtain an extended temperature range by placing a 120‐ohm resistor in series with the
ambient temperature sensor.
Note: With this resistor the discharge temperature will be at its maximum when ambient is at ‐15°F.
With this resistor, the calculated discharge air set‐point equals the dial set‐point at 35°F
(different from above). Above 40°F the calculated discharge air temperature will be below the
dial set‐point.
TABLE 11
Reset Ratio Pot
Setting
Reset Amount °F
(no resistor)
Reset Amount °F
(with a 120 ohm resistor in series)
1
10
18
2
11
20
3
13
24
4
16
30
5
21
37
MAKE/BREAK
RESET
and
OVERRIDE
“OR” and “V” Override
(Day Operation only)
To activate this feature DIP switch 3 must be off. If a thermostat or contact is closed across terminals
“OR” and “V”, the discharge temperature is set at 120°F (49°C). When thermostat or contact is open,
the discharge temperature is set at the dial setpoint plus any other resets being used.
“X” and “Z” Override
(Day and Night Operation)
To activate this feature DIP switch 3 must be on. During day operation, if a thermostat or contact is
closed across terminals “X” and “Z”, the discharge temperature is set at the dial setpoint plus the
maximum amount of reset upwards. When the thermostat or contact is open across terminals “X” and
“Z”, the discharge temperature is set at the dial setpoint less the maximum amount of reset
downwards.
During Night operation, if a thermostat or contact is closed across terminals “X” and “Z”, the discharge
temperature is set at 120°F (49°C). When the thermostat or contact is open across terminals “X” and
“Z”, heat is off.
