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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.
Figure 9
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Figure 9 shows how the DIP-1 should be attached to the CAS. Note that
the 1/4" O.D. plastic tubing on the top of the CAS unit must be cut and a 3-way male
barb TEE suitable for 3/16" I.D. tubing placed as shown in order to connect the DIP-1.
