Wiring; Wiring The Power; Wiring The Sensors; Wiring The Shutdown, Tstat, Or Setback - heat-timer Mini-MOD Installation And Operation Instruction Manual

WIrIng

WIrIng tHe poWer

(Terminals 1, 2)
• Bring the 120VAC 60Hz power wires through the bottom 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.
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.

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 must be connected to a temperature sensor located in the common header.
• The Mini-MOD is designed to be connected to a HT #904250-00 temperature sensor for immersion in a ⅜"
ID well (HT #904011-00 or equivalent). Contact the factory for additional temperature sensor options.
• Temperature sensor wires can be extended up to 500' by splicing 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 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)
• When Outdoor Reset is selected, the Mini-MOD will vary the system Set Point based on outdoor temperature.
• Whether in Set Point or Outdoor Reset modes, the outdoor sensor can be used as an Outdoor Cutoff. The Mini-
MOD will disable all boilers when the outdoor temperature is above the adjustable Outdoor Cutoff temperature.
This feature will automatically be activated when an outdoor sensor is connected.
• For an outdoor sensor use a Heat-Timer outdoor sensor (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 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 18.. This will provide the user with a customizable Day/Night Schedule.
See "Day/Night Schedules" on page 25..
• The Shutdown feature can be used whenever it is desirable to turn off the Mini-MOD 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, provide the capability of controlling
the operation of the Mini-MOD based on a thermostat input. See "Shutdown/Tstat/Setback Mode" on page 18. This
will provide the user with an adjustable Day/Night Schedule. See "Day/Night Schedules" on page 25..
• The thermostat will provide the Mini-MOD with a call for heat by shorting terminals 31 and 32.
• When the Shutdown input is enabled by closing the dry contact, or when the Tstat input is disabled by opening the
dry-contact, all active boilers will immediately modulate down to low for the Soft-Off period, then turn off.
• The System Output relay will remain active until the Run-On Delay expires and then it will turn off.
OUTPUT RATINGS:
120VAC, 6A RESISTIVE
1A PILOT DUTY, 15A TOTAL
FOR ALL CIRCUITS
INPUT RATINGS:
115VAC 60Hz , 30VA MAX
USE COPPER WIRE,
CLASS 1 WIRE ONLY.
WarnIng
ENCLOSED
ENERGY
MANAGEMENT
EQUIPMENT
99RA
OUTPUT RATINGS:
120VAC, 6A RESISTIVE
1A PILOT DUTY, 15A TOTAL
WarnIng
FOR ALL CIRCUITS
INPUT RATINGS:
115VAC 60Hz , 30VA MAX
USE COPPER WIRE,
CLASS 1 WIRE ONLY.
OUTPUT RATINGS:
120VAC, 6A RESISTIVE
1A PILOT DUTY, 15A TOTAL
FOR ALL CIRCUITS
INPUT RATINGS:
115VAC 60Hz , 30VA MAX
USE COPPER WIRE,
CLASS 1 WIRE ONLY.
ENCLOSED
ENERGY
MANAGEMENT
CAUTION : RISK OF ELECTRIC SHOCK
EQUIPMENT
More than one disconnect switch may be required
99RA
to de-energize the equipment before servicing.
Mini-MOD & Mini-Extension Installation Manual
CAUTION
: RISK OF ELECTRIC SHOCK
More than one disconnect switch may be required
to de-energize the equipment before servicing.
ENCLOSED
ENERGY
MANAGEMENT
CAUTION
: RISK OF ELECTRIC SHOCK
EQUIPMENT
More than one disconnect switch may be required
99RA
to de-energize the equipment before servicing.
SYSTEM
A
B
C
D
PROGRAM
Full Modulation Sequencing Control
SYSTEM
A
B
C
D
Full Modulation Sequencing Con
SYSTEM
PROGRAM RUN
A
B
C
D
PROGRAM RUN
Mini-MOD
Full Modulation Sequencing Control
DO NOT APPLY ANY VOLTAGE
RUN
TO INPUT TERMINALS
EN
E
MAN
EQ
9
11
Mini-MOD
Mini-MOD
DO NOT APPLY ANY VOLTAGE
TO INPUT TERMINALS
DO NOT APPLY ANY VOL
TO INPUT TERMINA