Chore-Tronics® 3 Control Troubleshooting
MT2398C
119
Equipment and Potentiometer Troubleshooting Continued.....
Problem Possible Cause Possible Solution
MS Board not functioning cor-
rectly, or outputs not functioning
correctly
.
A.) The DIP switches found on
t
he side of the MS board are in the
wrong position.
B.) Defective MS Bo
ard or Relay
Module.
C.) Poor I/O NET Connection.
betw
een the Relay Box and Main.
Box, or between MS Boards.
A.) Replacement boards come from
the factory
with all three DIP
switches in off position. If you
have an MS board operating
switches 17-32 or 33-40 then the
DIP switches need to change
positions (See Page 113).
B.) Replace Board.
C.) Check I/O Net Connection.
The lights above the manual
switches
are dimmer when on in
the automatic mode than in the
manual mode. Also Lights flash
bright for a second in automatic
mode.
Normal Operation. The indicator light is wired directly
acro
ss the coils of the Output Relay.
When the switch is placed in the man-
ual on position the full 24 volts are
place
d on the coil, causing the light to
glo bright. When the Relays are told
to come on by the Control in auto-
matic the full 24 volts is applied to
pu
ll the contacts in. The voltage is
then reduced to hold the contacts in.
This causes the light to glo dim.
When the Relays are on in automatic
mode, the Control occasionally puts
full voltage across the coils to assure
the Relay is still engaged.
Relays are constantly failing. A.) Relays are overloaded. Maxi-
mum is 1HP.
B.) There is a short in the wiring
connected to that Relay
.
C.) One of the stand-offs holding
the Relay mod
ule is broken and is
causing the board to touch the
back plate.
D.) Voltage from Back-up Ther-
mostat is wrong phase of 220.
A.) Reduce load on Relays.
B.) Find problem in wiring and cor-
rect.
C.) Replace stand-off.
D.) Connect other Phase of 220 to
Back-up Thermostat.
Pot not responding alarm (in
ter-
nal pot).
A.) Gear not making contact with
screw.
B.) Gear set screw not tight on
Potent
iometer shaft.
C.) Potentiometer not connected
to
Control and/or bad connec-
tion between Potentiometer
and Con
trol.
D.) Bad Potentiometer.
E.)First Opening movement too
small.
A.) Loosen Potentiometer assembly
m
ounting bolts and slide until
gear makes contact with the
screw.
B.)Tighten gear set screw.
C.) Connect Potentiometer to the
Con
trol and/or look for bad con-
nection and correct.
D.) Replace Potentiometer.
E.) Make Sure that the first opening
movement
causes at least a 10-
count change Potentiometer read-
ing.
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