Specifications

FM774/0708 BOOK 2 11
CO & CZ FAULT FINDING
NOTES
• R/U Indicator LED’s display incoming control signals only. Outputs must be verified with a
multimeter at appliance terminals.
• Resetting a CO KDU will reset to factory default any preset valves e.g. drain cycle interval, auto
mode temp.
• Damage to equipment can occur if power is not isolated when connecting or disconnecting key-
pads, or appliances from Roof Units.
• All version keypads with serial numbers larger than 30516 have internal timers fitted. Some of
these will be identified by a fluorescent orange sticker stating ’FITTED WITH INTERNAL DRAIN
VALVE TIMER’. All version keypads prior to the above serial number need to have an Exter-
nal Drain Valve Timer fitted.
EXTERNAL DRAIN VALVE TIMERS
• The External Drain Valve Timer is to be fitted to the Roof unit (Always remove existing External
Drain Valve timers fitted to roof unit before fitting new one). It is not necessary to remove any
existing External Drain Valve Timer fitted to the keypad.
• The timers generate a 5 second ON and 15 second OFF duty cycle to increase durability of the
drain valve. They do not affect the drain cycle times.
SLOWEST
FASTEST
• MINIMUM SPEED HAS BEEN
FACTORY SET
• IF NECESSARY ADJUST MINIMUM
SPEED.
• RUN FAN AT LEAST 10 MINUTES
BEFORE SETTING MIN. SPEED.
• ADJUST WITH KEYPAD SET AT
SPEED 1.
• DO NOT SET BELOW 700 RPM.
MINIMUM SPEED ADJUSTMENT
JUMPER FITTED
JUMPER REMOVED
MINIMUM SPEED ADJUSTMENT
The minimum fan speed is adjusted by changing the
configuration of the three jumpers on the Roof Unit
circuit board, indicated on the drawing on page 10. It is
important when setting speeds on 1000W, 750W and
600W motors that the minimum speed does not fall
below 750 RPM.
ROOF UNIT MOUNTED STYLE (SP3009)
IMPORTANT
ALWAYS REPLACE DRAIN VALVE TIMER WHEN
REPLACING ELECTRIC DRAIN VALVE.