Thermon Fastrax, Installation & Operation Manual

Page: 5 / 12

55
C. ELECTRICAL CONNECTIONS OVERVIEW
Status LEDs
Power & Simulate
Precipitation Switches
Set Point Dials
CAUTION
CAUTION.
Disconnect heater from power supply at
integral disconnect or fuse box before opening
closures or servicing heater.
Lock the switch in the “OFF” (open) position and
tag the switch to prevent unexpected power
application.
This heater should only be serviced by qualified
personnel with electrical heating equipment
experience.
Install and use the heater in accordance with local
codes and this Owner’s Manual.
NOTE:
Refer to schematic inside door for electrical connections.
C.1 Power
Connect 120V power to terminals 1 and 3, and ground
wire to ground stud.
C.2 Control
Connect heater control to terminals 9 and 8, (Normally
Open, NO) or 9 and 7 (Normally Closed, NC).
C.3 Alarm Indication
1. A 120Vac Alarm signal from the heater can be used to
trigger the aggressive retry feature of the EMS.
1.1 Connect the Alarm Neutral terminal 6 to the
neutral in the heater. Connect the Alarm signal
(120Vac) from the heater to terminal 5 on EMS.
1.2 On a MARK VI heater the alarm signal is
available directly on the “ALARM” relay coil,
contact A1.
1.3 On a MARK VII heater connect the alarm signal
to either Terminal Block 1 terminal 1 or to the
“ALARM” relay terminal 2.
1.4 On a Micro heater the signal is available at the
“ALARM” relay terminal 9.
NOTE:
YARDMASTER heaters do not require this connection.
The aggressive retry feature is integrated into the
YARDMASTER controller.
C.4 Aggressive Retry
1. If the heater you are controlling is equipped with a
flame safety relay reset module, connect the reset to
the appropriate terminals 14 and 13 (NO). If the heater
is equipped with Direct Spark Igniter connect the
reset normally closed contact, terminals 12 and 14,
into the wire to the request relay.
NOTE:
YARDMASTER heaters do not require this connection.
The aggressive retry feature is integrated into the
YARDMASTER controller.
1.1 Turn on power at electrical service. Ensure 5
amp panel breaker is closed.
C.5 Operation and Adjustments
1. Set Point Dials: The EMS board (15919) monitors
environmental conditions based on various set
points. All set points are easily adjustable by dials
located at the top of the EMS board. These set points,
when triggered by environmental conditions, send
out a signal to the controller to turn the heaters on.
2. Power Switch and Moisture Simulation Switch : The
power switch and a moisture simulation switch
enable resetting or disabling the EMS and aid in
troubleshooting.
LED Lights: On the right side of the EMS board there
are a number of LED lights which indicate the status
of the EMS board.