24
MB Pool & spa heater
On/Off
Switch
Thermostat
Knob
185 265 and 405 Models
055, 105 & 155 Models
The pool or spa water temperature is controlled by the
pool heater thermostat on the front panel of the heater.
The control centre contains an On/Off switch and
one Temperature Control Knob. The switch functions
as a means for turning the heater on or off, however
for longer periods of isolation the Heater should be
switched off at its Mains supply.
The Thermostat is fi tted with a means of limiting the
upper temperature limit below the maximum level.
The knob stop adjustment ring illustrated below is
adjustable by loosening the set screw, rotating the
knobstop ring to the desired location and retightening
the set screw.
All Models
PRESSURE SWITCH
The pressure switch, or heater actuator, ensures
that the heater operates only when the fi lter pump
is in operation.
It is factory set at 0.12 bar (1.75 PSI) for deck level
installations. When the heater is located below the
level of the spa or pool, it may be necessary to reset
the pressure switch to compensate for the no-fl ow
static head.
If it is necessary to reset the pressure switch, we
recommend the following procedure:
Summary of Controls
(Left to Right)
ON/OFF Switch -
Turns the Heater On and Off and
resets the Ignition Control if locked out.
Lock/Unlock Button -
If it is pressed for 2 sec-
onds it locks the Set Temperature so the Pool Tem-
perature Knob is inoperative. To unlock, press again
for 2 seconds.
With a short press the Set temperature is displayed.
It will fl ash if the Lock is ON.
Pool Temperature Display -
This normally shows
the Pool Temperature but also show the Setting
Temperature when the Pool Temperature Control
Knob is moved. A Setting Dot is displayed whilst it is
adjusted. The Display is also used for commissioning
and diagnostic purposes.
(Page 34)
Pool Demand LED - Green
Off
- There is no Pool Heating demand, pool heating
is off.
On
- There is Pool Heating Demand and the Pool is
not up to temperature.
Flashing
- The Pool Heating Demand is met, the
pool is up to temperature.
Pool Temperature Control Knob
16°C to 32°C or 41°C (60°F to 90°F or 106°F)
(Maximum is changed in Setup Mode, see Page 34)
Rotate clockwise to increase the Pool Temperature.
The Setting Temperature is shown whilst rotating the
control knob and when released fl ashes 3 times to
confi rm setting.
To lock the required Temperature Setting see
Lock/Unlock Button
.
Pool Filter Blocked - Yellow
On - If the pump is running and there is insuffi cient
pressure, possibly due to a blocked Pool Filter. The
Heater will not run.
Overheat - Red
On - This indicates the Heater has overheated and
shutdown. Reset. If this persists this should be
investigated by a Service Engineer.
Overheat Reset (not on front panel)
If the Overheat Indicator has lit the Heater will not
work until the thermostat has been reset. Wait until
the Heater is cool then remove the door and locate
the Overheat Thermostat mounted on its bracket.
Press its centre and it will click.
The Red Overheat indicator will go out and the
Heater can now run.
Knobstop Ring
Set Screw
Pool Temperature Range
Spa Temperature
Range
Standby
Temperature
kstop.tif
