Install Instructions

Alarm Horn
Pressing the alarm test/normal/silence switch to the
test position or activating the alarm float should turn
on the alarm horn. If the horn does not sound, replace
with horn of same type.
Alarm Light
Pressing the alarm test/normal/silence switch to the
test position or activating the alarm float should turn
on the alarm light. If the light does not activate,
replace with bulb of same type.
Alternating Relay or Device
The alternation can be sequenced by lifting the float
switches or making jumper wires to simulate the
floats closing. If the alternator fails during testing,
replace with same type. Consult factory at 1-800-
RHOMBUS (1-800-746-6287) when in doubt about
testing procedures or results.
Float Controls
Check the floats through their entire range of
operation. Clean, adjust, or replace damaged floats.
Checking the float resistance - The float
resistance can be measured to determine if the float
is operating correctly or is defective. Use the
following procedure to measure the float resistance:
1. Isolate the float by disconnecting one or both of
the float leads from the float terminals.
2. Place one ohmmeter lead on one of the float
wires, and the other ohmmeter lead on the other
float wire.
3. Place the ohmmeter dial to read ohms and place
on the R X 1 scale. With the float in the “off”
position, the scale should read infinity (high
resistance). Replace the float if you do not get
this reading. With the float in the ON position,
the scale should read nearly zero (very low
resistance). Replace the float if you do not get
this reading.
NOTE: Readings may vary depending on the length
of wire and accuracy of the measuring device.
Fuses
Check the continuity of the fuse. Pull the fuse out of
the fuse block. With the ohmmeter on the R X 1 scale,
measure resistance. A reading of infinity indicates
a blown fuse and must be replaced. Replace fuse
with same type, voltage and amp rating.
Magnetic Contactor
Contacts - Check the contacts for severely burnt
or welded contacts. The contactor arm should move
freely.
Coil - Measure the coil by disconnecting one of the
coil leads. Measure the coil resistance by setting
the ohmmeter on the R X 1 scale. A defective coil
will read zero or infinity, indicating a short or opened
coil respectively. If contactor is defective, replace
with same type.
NOTE: Readings may vary slightly depending on
the and accuracy of the measuring device.
Motor Protective Switch
Test by inserting a paper clip or other small device
into the test hole and push to the left. The relay should
trip.
Troubleshooting
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7228000A