Immersion Heater; Mixer Valve & Actuator Control - Potterton iHE 100 Installation & Servicing Instructions Manual

2.8 IMMERSION HEATER

An immersion heater boss is fi tted in the side of
the DHW tank in order to facilitate the fi tting of an
electric immersion heater.
This immersion heater must have a 2
thread and a nominal length of no greater than
400mm
Fitting
Switch off the DHW circuit and with the tank drained
of water, remove the threaded bung
Place a suitable supplied gasket around the heater
base. Keeping the heater element horizontal and
square with the boss, insert the heater into the
opening. Secure by turning the heater onto the
threads.
Once heater is fi rmly screwed into boss, fi ll the tank
with water and check for leaks at maximum opera-
tional pressure.
Install electrical supply to immersion heater accord-
ing to the manufacturers instructions, ensuring that
the heater is wired with heat resisting or mineral
insulated cables complying with BS6207.
INTEGRATION WITH CONTROLS
The appliance controls have the facility to activate
an immersion heater as a backup for the normal
generation of DHW. e.g. The immersion heater
would be automatically switched on if the appliance
was unable to generate DHW for any reason
Refer to Fig 4.6 on page 22 for suggested details
on how to wire an integrated immersion heater.
iHE
1 / " BSP male
4
Max
400mm
The optional purchased AGU2.5 "module" (# 3) would
require to be defi ned under parameter 6022 as "Multi-
functional". The output QX23 and other settings would
be defi ned according to the following table:
Menu Line
no
Confi g (QX23) 6038
To confi gure as a backup heater
DHW storage 5060
tank
5061
5062
To confi gure as a summer heater
DHW storage 5060
tank
5061
5062
To confi gure as an independantly controlled
heater
DHW storage 5060
tank
5061
5062
2.9 MIXING VALVE & ACTUATOR
CONTROL
The AGU2.5 "Module" can be used to control a 230V
valve actuator to regulate the fl ow temperature
of the heating circuit to which it is connected. The
actuator uses 3-point control to open and close the
valve.
Refer to Fig 4.4 on page 20 for suggested details
on how to wire a mixing valve
In this example, if the temperature of HC1 needed
to be increased, the controls would supply 230V
through QX21 (Y1) to open the valve until the tem-
perature rise was detected by the sensor B1.
If the temperature of HC1 needed to be decreased
the controls would supply 230V through QX22 (Y2)
to close the valve until the temperature fall was
detected by sensor B1.
Precise temperature control is maintained by al-
ternating 230V via QX21 & QX22 until the desired
temperature is maintained, at which point no voltage
maintains the valve position.
12
Setting
El imm heater DHW K6
Substitute
Time program 4 / DHW
External thermostat
Summer
Time program 4 / DHW
External thermostat
Always
Time program 4 / DHW
External thermostat
GB/IE