Pre-Heat Relays (2400E) - Broaster 2400 Series Service Manual

PRE-HEAT RELAYS (2400E)

R3 RELAY
The R3 relay controls the power to contac-
tor C2 and the TDR relay. If R3 relay is faulty
when the HEAT ON light is illuminated there
will be a 10 second delay and only the C3
contactor will energize.
1. See ACCESS FOR SERVICE.
2. With needle nose pliers, disconnect
wires from terminals 5 and 6.
3. Check between terminals 6 and 4 and
between terminals 5 and 3 with an
ohmmeter. Meter should indicate an
open circuit between both sets of ter-
minals. If not, relay is faulty.
4. Check between terminals 6 and 2 and
between terminals 5 and 1 with an
ohmmeter. Meter should indicate an
closed circuit between both sets of
terminals. If not, relay is faulty.
5. With needle nose pliers, disconnect
one wire from the coil terminals (Termi-
nal 7 or 8).
6. Check between coil connections with
an ohmmeter. Meter should indicate a
closed circuit. If not, coil is faulty.
TDR RELAY
The TDR relay controls the power to the C3
contactor. When the oil temperature has
reached set point and the HEAT ON light
goes out for 10 seconds or more, the TDR
relay is faulty if the C3 contactor does not
energize when the HEAT ON light is illumi-
nated again.
4-9
broaster.com Manual #15460 8/02 Rev 6/15
1. See ACCESS FOR SERVICE.
2. With needle nose pliers, disconnect
wires from the COM terminals of sides
A & B of the TDR.
3. Check between COM and NC on both
sides A & B with an ohmmeter. Meter
should indicate an closed circuit
between both sets of terminals. If not,
relay is faulty.
4. Check between COM and NO on both
sides A & B with an ohmmeter. Meter
should indicate an open circuit
between both sets of terminals. If not,
relay is faulty.
5. With needle nose pliers, disconnect
one wire from the input terminals.
6. Check between the input terminals
with an ohmmeter. Meter should indi-
cate a closed circuit. If not, the TDR
relay is faulty.