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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 satisfied.
2. Disconnect power to the CAS unit and repeat Step 1. Note: The unit should not run and the
appliance should not fire in this condition.
3. Inspect the duct pipe for cracks and security to the CAS unit, VRV (if installed), and vent hood.
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 the Field Controls Technical Support at 1-800-742-8368.
Item Description
Motorized Fan
Air Pressure Switch
120 VAC Relay for CAS-3
Page 8
Field Part Number
46274100
46158500
46257300
PN 46401800 Rev B 10/06
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