Service manual

A DJM3.2 MANUAL
• With dipswitch 3 "on" the DJM3.2 operates as discharge control WITH room reset during the
day when the blower is operating continuously. At night when operating from the room
thermostat, the blower is operating intermittently. (Dipswitch 3 on.)
• With dipswitch 3 "off " and the control in "day" operation (no power on terminal “K”), the DJM3.2
operates only on Discharge control. There is no room reset being allowed from the room
thermostat. (The supply fan operates continuously during the day.)
• At night the room thermostat operates as a room control if the heat (“HS”) and night (“K”)
terminals are activated on the DJM3.2. The supply fan will be operating intermittently and will be
turned on by the DJM3.2 after the room thermostat calls for heat. During intermittent blower
operation, the supply fan blower will start 30 seconds after the burner fires up and shut off 60
seconds after the burner stops firing. The combustion blower will run for 60 seconds after the
flame is turned off to assist in cooling down the heat exchanger.
• Lower Set-Point at Night - If room reset is required during the day at one set-point, then at night
room is to be controlled at a lower set-point, a separate night thermostat and/or set-point dial
must be switched by an external relay.
NOTE: There is an optional room thermostat operation using a standard make/break
thermostat for room sensing in place of the modulating control. For information
on this option refer to this guide under “Make/Break Thermostat Operation”
below. It will control as per detail there.
Make/Break Night Heat Thermostats
Note the information below in the section on ROOM RESET.
XVII. ROOM RESET THERMOSTAT OPTIONS
Refer to the following sections for a full understanding of the room thermostat in your systems
application:
• DAY/NIGHT OPERATION (option) (also refer to night information above).
• TEMPERATURE CONTROL (information above and below).
• MODULATING ROOM RESET (option using TE 6100 thermostat below).
• MAKE/BREAK THERMOSTATS (option using a standard room thermostat below).
• Additional technical information is also located under "Staged Resets and Overrides".
Note that when any override is calling, it will affect the "Calculated Set-Point" and its relation with the
"Temperature Readout". It is recommended that the service technician be very familiar with
these two sections of the manual.
Modulating Room Reset (continuous blower operation only)
Dipswitch 3 must be "on". This option also requires a TE 6100 wired:
TE 6100 DJM3.2
GREY
wired to terminal V
VIOLET
wired to terminal X
ORANGE
wired to terminal Y
BLUE
wired to terminal Z
If dipswitch 3 is on and the TE 6100 is not wired to the correct DJM3 terminals, the DJM3 will reset
the discharge temperature down as it thinks that the room sensor is very warm.
The room temperature requirements can increase or decrease (reset) the calculated discharge air set-
point. The required amount of discharge air reset can be estimated by referring to the chart on Page
13.
Page 12 Revised: 3/11/99