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ITEM DESCRIPTION
FIELD PART NUMBER
Motorized Fan
46274100
Pressure Switch Fxd for CAS-4TMR
511100200
24 VAC Relay for CAS-4
46161400
120 VAC Relay for CAS-3,4
46257300
MAINTENANCE
1. Inspect the system annually to ensure proper operation by observing that the fan activates when a call for
heat occurs and deactivates when the call for heat is satisfi ed.
2. Disconnect power to the CAS unit and repeat Step 1. Note: The unit should not run and the appliance
should not fi re in this condition.
3. Inspect the duct pipe for cracks and security to the CAS unit and vent hood. The CAS unit will not allow
the appliance(s) to fi re if inadequate air fl ow is allowed into the inlet of the CAS.
4. Clear any obstructions, if present, from the inlet of the vent hood and the outlet of the CAS unit.
5. Periodically, the fan blade chamber may need cleaning. First, disconnect the power supply to the CAS.
Next, disconnect the duct pipe from the unit. Then remove the top pan and clean the fan housing area as
needed. Reattach the top pan, reconnect the duct pipe and the power supply.
REPLACEMENT PARTS
The following items are available for replacement, if needed. In order to replace these parts, power must be
disconnected and the unit must be disassembled. If this is necessary, take note of the positions and locations
of whatever items that may need to be removed to replace other items.
If in doubt, please consult Field Controls Technical Support at 1-800-742-8368.
P/N 46284600 Rev L 09/19
