09
WHISPA III
®
5000, 9000 & 12000 RCU
9.0 Operating Instructions
WHISPA III
®
RCU fan convectors are controlled by the switch on
the front of the unit.
Ensure the electricity supply is switched on.
Heating Mode
The fan will only operate when
•
The central heating boiler is on
•
The pump is running
•
The system water temperature is greater than 110°F.
•
The room thermostat linked to the unit is switched on.
Ensure boiler is on, and set timer, boiler controls and room
thermostats as necessary.
l
Set the fan speed switch to the LOW (I) position.
l
The unit will now run on low fan speed. For satisfactory
operation the mean water temperature should not be below
140°F.
Temperature Control
The room thermostat setting should be adjusted to obtain the
desired temperature.
The fan speed can be set to boost by switching the fan speed
switch to II.
A low speed setting is recommended for normal operation with
the higher speeds for boost heating when required.
Low Limit Operation
The low limit thermostat fitted to the WHISPA III
®
RCU will
ensure that the fan stops after the heating system is switched
off and the water flow stops. If left in an operating position the
unit will automatically restart when the heating system is
reheated.
Off Position
Set the fan speed selector switch to the off position.
Operating Sequence
Power On
Timer On
Boiler On
Pump running
Select fan speed
Turn up room
thermostat
Solenoid valve
energises and valve
opens
(1-2 seconds)
Warm water flows
into coil. After 1-2
mins low limit stat
makes as coil
temperature rises
and fan starts.
Unit cycles on room
thermostat through
similar sequence
while heating is on.
8.0
9.0
EN
33359 Whispa RCU (US) FR.qxp 15/04/2019 11:00 Page 10
