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WIrIng
• All wiring must enter the enclosure through the bottom knockouts.
• Class 1 voltage wiring must utilize a different knockout and conduit from any Class 2 voltage wiring.
WIrIng tHe poWer
(Terminals 1, 2)
• Bring the 120VAC 60Hz power wires through the bottom left knockout of the enclosure.
• Connect the hot line to terminal marked L.
• Connect the neutral line to the terminal marked N.
• Heat-Timer recommends installing a surge suppressor on the power source to the Mini-MOD-CNC.
class 1 voltages must enter the enclosure through a different opening from any class 2 voltage wiring.
Heat-timer recommends installing a surge suppressor on the power source to the Mini-Mod-cnc.
WIrIng tHe sensors
connect the shield at the control terminal end and cut the shield wire at the sensor end.
systeM sensor WIrIng
(Terminals 27, 28)
• A Mini-MOD-CNC must be connected to a System temperature sensor (HT #904250-00 provided) located in the
common header. The sensor must be inserted in a 3/8 ID well (HT #904011-00 or equivalent).
• Temperature sensor wires can be extended up to 500' by splicing its wires with a shielded 2-conductor cable
(Belden #8760 or equivalent (#18/2)).
• Temperature sensors have no polarity. Connect the two wires from the sensor to the Mini-MOD-CNC terminals
marked SYSTEM TEMP 27, 28.
• Connect the sensor shield to the circled terminal 28 with one of the sensor wires.
outdoor sensor WIrIng
(Terminals 25, 26)
• The Mini-MOD-CNC will vary the system Set Point based on outdoor temperature. In addition, the outdoor sensor
is used as an Outdoor Cutoff. The Mini-MOD-CNC will disable all boilers when the outdoor temperature is above
the adjustable Outdoor Cutoff temperature.
• For an outdoor sensor use the outdoor sensor provided (HT #904220-00).
• The sensor wires can be extended up to 500' using shielded 2-conductor cable (Belden #8760 or equivalent (#18/2)).
• Temperature sensors have no polarity. Connect the wires from the outdoor sensor to the Mini-MOD-CNC terminals
marked OUTDOOR TEMP - 25, 26.
• Connect the shield to the circled terminal 26 with one of the sensor wires.
WIrIng tHe sHutdoWn, tstat, or setBack
(Terminals 31, 32)
• The Shutdown will be available when selected as the Shutdown/Tstat/Setback mode from the Startup menu. See
"Shutdown/Tstat/Setback Mode" on page 19. This will provide the user with an adjustable Day/Night Schedule. See
"Day/Night Schedules" on page 28.
• The Shutdown feature can be used whenever it is desirable to turn off the Mini-MOD-CNC stage outputs from a
remote location or another controller (i.e. EMS input).
• The Tstat option, when selected from the Shutdown/Tstat/Setback startup menu, offer the capability of controlling
the operation of the Mini-MOD-CNC based on a thermostat input. This will provide the user with an adjustable
Day/Night Schedule.
• The thermostat will send the Mini-MOD-CNC a call for heat by shorting terminals 31 and 32.
Mini-MOD-CNC & Mini-Extension Installation Manual
OUTPUT RATINGS:
120VAC, 6A RESISTIVE
1A PILOT DUTY, 15A TOTAL
FOR ALL CIRCUITS
INPUT RATINGS:
115VAC 60Hz , 12VA MAX
USE COPPER CONDUCTORS ONLY
ENCLOSED
WarnIng
ENERGY
CAUTION
MANAGEMENT
More than one disconnect switch may be required
EQUIPMENT
99RA
to de-energize the equipment before servicing.
WarnIng
OUTPUT RATINGS:
120VAC, 6A RESISTIVE
1A PILOT DUTY, 15A TOTAL
FOR ALL CIRCUITS
INPUT RATINGS:
115VAC 60Hz , 12VA MAX
USE COPPER CONDUCTORS ONLY
ENCLOSED
ENERGY
MANAGEMENT
EQUIPMENT
99RA
OUTPUT RATINGS:
120VAC, 6A RESISTIVE
1A PILOT DUTY, 15A TOTAL
FOR ALL CIRCUITS
INPUT RATINGS:
115VAC 60Hz , 12VA MAX
USE COPPER CONDUCTORS ONLY
ENCLOSED
ENERGY
CAUTION
: RISK OF ELECTRIC SHOCK
MANAGEMENT
More than one disconnect switch may be required
EQUIPMENT
99RA
to de-energize the equipment before servicing.
SYSTEM
A
B
C
D
: RISK OF ELECTRIC SHOCK
PROGRAM
SYSTEM
A
B
C
D
CAUTION
: RISK OF ELECTRIC SHOCK
More than one disconnect switch may be required
to de-energize the equipment before servicing.
PROGRAM
Condensing / Non-Condensing Control
SYSTEM
OD=
A
B
C
D
PROGRAM
RUN
Mini-MOD-CNC
Condensing / Non-Condensing Control
25
o
145
OD=
F
SYS=
<<A>>
B
100%
52%
DO NOT APPLY ANY VOLTAGE
RUN
TO INPUT TERMINALS
Mini-MOD-CNC
Condensing / Non-Condensing Contro
25
o
OD=
F
SYS=
<<A>>
100%
DO NOT APPLY ANY VOLTAGE
RUN
TO INPUT TERMINALS
Mini-MOD-CNC
25
o
145
o
F
SYS=
F
<<A>>
B
100%
52%
DO NOT APPLY ANY VOLTAGE
TO INPUT TERMINALS
ENERGY
MANAGEME
EQUIPMEN
99RA
11
o
F
145
o
F
B
52%
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