User Manual
Heaters start but
heat ouptut does
not change in
response to
SmartBox
™
setting.
Yes
Problem 7
Is the Smart Sense™
forced air gas valve or
the radiant heater’s
proportional valve
receiving 1-15 VDC
from fuse?
No
Are sensors
positioned
properly?
Ensure all sensors are located
away from drafts, air inlets,
cold spots, etc.
Radiant heaters:
Ensure the
radiant sensor bracket is
installed and that the sensor
is located properly within its
housing. It should be 1/8 in.
to 3/16 in. from the end of
and inside the sensor housing.
No
Yes
A. Set the SmartBox
™
for the specific heater to a
higher temperature (at least 10F) over room
temperature.
B. Verify increase in VDC to gas valve.
Forced Air Heaters:
Measure across terminals at
valve to obtain reading
Radiant Heaters
: Loosen the proportional gas
valve’s housing screw and pull back the connector
block sufficiently to allow voltage meter probes to
be inserted at the valve terminals.
C. If no increase in VDC (should be 13-15 VDC) at
gas control, then check the output at the
respective signal conditioner terminals:
Forced Air
: Terminals 3 and 4 (brown wires)
Radiant:
Terminals 10 and 11 (blue wires).
If 13-15 VDC is measured at output but not at
valve, check all wiring and terminals between
the signal conditioner and variable rate valve.
D. If no reading is given at the output of the forced
air or radiant signal conditioner, then the signal
conditioner for that zone of heaters is defective
and must be replaced.
Have the variable
rate output fuses of
the SmartBox
™
been checked for
continuity?
No
Check the fuses. If
defective, replace.
Are SmartBox
™
sensors
positioned to the
same height as
the room control
sensors?
Reposition the sensors. Refer
to sensor location
instructions in this manual.
No
Yes
SmartBox
™
Zone 1
(forced air) does not
operate concurrently
with room controller.
Problem 8
Check temperature curve for
both the SmartBox
™
and the
room controller. Verify the
temperatures match.
22
Heaters start
and operate
properly, but
zone light is
OFF
Problem 6
Zone LED is defective or
poor electrical connecton
between programmable
controller and LED.
Verify 24 VDC to zone LED.
If present replace LED. If
absent, repair wiring
between controller and
LED.
Yes
Check for
blockages in
gas supply