Fig. 10. Settings 427478C T & 427479C HT models only
Top view of PCB cover showing pot location
jumper location and terminal location
Ambient Response Humidity Function – 427479C HT only
The inbuilt humidity sensor automatically adjusts dependant on ambient
conditions and does not need adjusting.
Speed Selection 427478C T & 427479C HT Models
Adjust the fan speed by turning the pot clockwise to increase, and anti-
clockwise to decrease. If continuous running mode is selected, the trickle
speed is approximately 50% of the chosen high speed.
Comfort mode (Mode 5) – 427478C T & 427479C HT Models
Mode 5 should be selected to enable comfort mode. (default Mode 4). This
feature delays the LS input boost operation for a maximum of 20 minutes to
reduce noise and cold drafts while bathing. After the LS is disconnected, the
fan will switch on for the same period the LS had been active (up to 20
minutes), plus the overrun time period (15 minutes).The Fan LED will “Blink”
when LS is on and comfort mode is enabled.
Timer Function (Mode 2,4 or 5) 427478C T & 427479C HT Models
See below table for jumper positions and fan functions.
Speed adjuster:
To INCREASE the Boost
speed AND proportional
trickle speed, turn
CLOCKWISE
To REDUCE the Boost
speed AND proportional
trickle speed, turn
must be used
with surface
wiring.
Will “Blink” in
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