Controls - Central Control Board - Ccb - A.O. Smith Cyclone Xi Service Handbook

Commercial gas high efficiency water heaters bth 120 thru 500 models series 100 and 101

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CONTROLS – CENTRAL CONTROL BOARD – CCB

The Central Control Board or CCB is contained

in the housing shown below. Access to the

board and the wiring harness plugs can be

accomplished by removing two Phillips screws

holding the cover.

The CCB is controlled by the settings given

through the desk top menu (UIM). The CCB also

monitors all pressure switches, the hot surface

ignitor, tank temperatures, the gas valve, the

anodes, and the flame sensor.

The CCB directly controls blower speed on the

BTH 199 and 250 models and indirectly controls

blower speed on the BTH 400 500 by means of a

Variable Frequency Drive (see page 38).

Note: Improper operation may be the result of a

loose connection. Please check all wiring

connections and the power supply to the water

heater.

A.O. Smith – Technical Training Department

CYCLONE Xi COMMERCIAL GAS WATER HEATER

BTH 120 thru 500 SERVICE HANDBOOK

Remove these

screws to release

cover

Servicing should only be performed by a Qualified Service Agent

This view shows the cover removed from the

CCB.

This is the back of the UIM.

316586-000

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