User Guide

Damper LED On
But Damper Not
Responding
Panel LEDS
On But System
Not Responding
LEDs and
System Not
Responding
Measuring
Thermostat
Voltages
NCM300
Damper LED
Not Responding
Testing Damper
Motors
Check the damper wiring to insure it
is correctly wired. Be sure the wires
are secured in the terminals. Test the
damper motor to insure it is properly
operating. If the problem still persists,
contact technical support.
Check the HVAC wiring to insure it is
correctly wired. Be sure the wires are
secured in the terminals. Check that
there is 24VAC at the Rc and Rh
terminals. Use the HVAC system
common (C) for the ground lead of
your meter. Check that Rh and Rc are
connected if the system uses a single
transformer.
For a gas/electric system test the
HVAC by shorting terminals Rh and
W1/B together to activate the heater,
Rc to Y to activate the compressor and
Rc to G to activate the fan. If the HVAC
system has responded properly, call
EWC technical support.
For a heat pump system test the
heating by jumping terminals Rc to Y,
W1/B and G. For a cooling test jump
Rc to Y, O and G.
Press the RESET button for 1 second to clear
the time delay that may be preventing the
call. The panel could be in minimum run
time, short cycle delay, changeover delay or
opposite system timing mode.
Check that the STATUS LED is
blinking to insure the computer is
operating properly, press and hold
the RESET button for 7 seconds to
reboot the CPU.
Heat/Cool thermostats will apply 24vac to
the W/E terminal during a heating call.
During a cooling call, 24vac is applied to
both Y & G. During a continuous fan call,
24VAC is applied to the G terminal.
Be sure the Rc and Rh terminals at the
thermostats are jumped together if your
specific installation requires it.
Heat Pump thermostats will apply 24vac to Y
and G during a 1st stage heating call. 24vac
will be applied to W/E during a 2nd stage
call. In Emergency mode, 24vac is applied to
W/E & G. During a cooling call, 24vac is
applied to Y, G & O.
If the system still does not respond, measure
the voltage at each zone thermostat terminal
W/E, Y, & G to insure they are correct and a
call is in order.
Check that the STATUS LED is
blinking. If it is not, the panel may be in
a shutdown mode due to a short in the
field wiring. See Table 1. Detecting
24vac shorts.
Press the RESET for 1 second to
clear any time delay(s) that may be
keeping the call off and the damper
from not responding.
Check the voltage at each zone
thermostat terminal W, Y and G
terminals to insure the damper should
be activated.
If the problem still persists, call the
technical support hot-line.
For a RDN/SMDL/BMDL damper,
connect 24VAC common to terminal
1, and 24VAC to terminals 2 and 4.
The damper should open. Remove
24VAC from terminal 4 and the
damper should close.
For a BMD/SMD/ND/URD damper,
connect 24VAC common to terminal
1, and 24VAC to terminal 4 and the
damper should open. Remove
24VAC from terminal 4 and apply
24VAC to terminal 6 and the damper
should close.
For a power close spring open
damper, connect 24VAC to the two
motor “M” terminals, and the damper
should CLOSE. Remove the 24VAC
and the damper should OPEN. For a
power open damper, the action will
be reversed.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX [phone] E-Mail- [e-mail]
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Table 2. Detecting Damper Problems
Table 3. Detecting Heating, Cooling and Fan Problems