What is a cylinder thermostat?
... an explanation for householders
A cylinder thermostat switches on and off the heat
supply from the boiler to the hot-water cylinder. It
works by sensing the temperature of the water inside
the cylinder, switching on the water heating when the
temperature falls below the thermostat setting, and
switching it off once this set temperature has been
reached.
Turning a cylinder thermostat to a higher setting will
not make the water heat up any faster. How quickly the
water heats up depends on the design of the heating
system, for example, the size of boiler and the heat
exchanger inside the cylinder.
The water heating will not work if a time switch or
programmer has switched it off. And the cylinder
thermostat will not always switch the boiler off,
because the boiler sometimes needs to heat the
radiators.
Cylinder thermostats are usually fitted between one
quarter and one third of the way up the cylinder. The
cylinder thermostat will have a temperature scale
marked on it, and it should be set at between 60C and
65C, then left to do its job. This temperature is high
enough to kill off harmful bacteria in the water, but
raising the temperature of the stored hot water any
higher will result in wasted energy and increase the
risk of scalding.
If you have a boiler control thermostat, it should
always be set to a higher temperature than that of the
cylinder thermostat. In most boilers, a single boiler
thermostat controls the temperature of water sent
to both the cylinder and radiators, although in some
there are two separate boiler thermostats.
Drayton
MiStat
TM
C
Cylinder Thermostat
Model: C110C
Invensys
Customer Service Tel: 0845 130 5522
Customer Service Fax: 0845 130 0622
Technical Helpline: 0845 130 7722
Website: www.draytoncontrols.co.uk
E-mail: customer.care@invensys.com
l
@DraytonControls
x
/DraytonControls
EU Design Regs:- 002180638-1/2/3
User Guide 06490192001 Iss E
MiStat
MiStat
HOMEOWNER Guide
HOMEOWNER Guide
Step 5: Receiver - Key & LED
→
Step 1: Keys and Display - MiStat
RF Pack: MiStat C110C
→
Step 2: +hr (Timer)
Press +hr to start the Timer. The prior used
temperature and time will be displayed and the
temperature will flash.
Press +/- to adjust +hr temperature, then press ( )
to confirm.
Press +/- to adjust +hr period between 0 and 23 hours.
Press (
) to confirm.
→
Step 3: Additional User Settings
ID Feature: Description: Factory Pre-Set:
1 MAX-TEMP
It will not be possible to set a higher
temperature
If MAX-TEMP and MIN-TEMP are
set to the same value, it will not be
possible to change temperature
with the +/- keys.
70°C
2 MIN-TEMP
It will not be possible to set a lower
temperature
40°C
DONE
Exit from the settings menu to USER-S
Lamp
colour
Mode Action Key
Function
Green Normal Call for heat
(boiler is firing)
None
Green
Flashing
Normal RF
communication
None
Off Normal No call for heat
(boiler is not
firing)
None
Red RF loss
or not
bound
No call for heat Switches
the boiler
On for 1hr
Amber RF loss
or not
bound
Call for heat Switches the
boiler Off
→
Battery Handling
Batteries, rechargeable or not, should not be disposed
of into ordinary household waste. Instead, they must be
recycled properly to protect the environment and cut down
the waste of precious resources.
Your local waste management authority can supply details
concerning the proper disposal of batteries.
In compliance with the EU Directive 2006/66/EC, the button
cell battery located on the printed circuit board inside the
product, can be removed at the end of the product life, by
professional personnel only.
Step 4: Changing the Batteries
How do I know when to change
the batteries?
When the batteries start to run low a battery icon will
flash in the display to indicate “low battery”, during
this time the MiStat will function normally. When
the battery icon alone is shown in the display, the
batteries are completely exhausted and the MiStat will
cease to function (see below). Re-activate by replacing
the batteries.
How to replace the batteries
Remove the battery covers as shown. Replace the batteries with 2 x 1.5V IEC LR6 (AA) Alkaline batteries ensuring
correct orientation. Replace the battery covers pressing fully home.
Battery Covers:
Slide outwards
to remove
MiStat Rear
LED: See table below for details
Key: See table below for details
MiStat
MiStat
MiStat
To set a suitable temperature for up to 23 hours, e.g.
for short term absence.
Now the timer is running. The time will be counted
down each hour.
Once the time has elapsed, control returns to the prior
temperature screen.
The Timer can be cancelled by pressing
key or by
setting the +hr period to 0.
Customize the controller according to personal requirements.
To enter User Settings
Press + & – keys for approx. 5
Seconds to enter the settings
menu as shown below.
Press Select (
) to enter the user
settings.
To exit User Settings
Press + & – keys for approx. 5
seconds to exit.
If there is no key pressed for
2 minutes the system will exit
the menu, any changes will be
saved.
✎ Troubleshooting:
1 Setting temperature values is restricted
a
Are Minimum/Maximum temperatures activated?
see Homeowner Guide Step 3.
2
NO SIGNAL is visible on the screen, no reaction on
key presses anymore
a
Is the receiver powered? (Red signal lamp should
be visible)
3 LOCKED is displayed
a see Installation Guide Step 5 - LOCK
4 Is the battery symbol visible?
a Replace batteries, see Homeowner Guide Step 4.
5
STARTING is visible on the screen, no reaction on key
presses anymore
a
Is the receiver powered? (Red signal lamp should
be visible)
6
WAIT is visible on the screen, no reaction on key
presses anymore
a
Is the receiver powered? (Red signal lamp should
be visible)
MiStat
Current hot water temperature
Current set temperature
Call for heat indication.
This flame will be visible
when the hot water
temperature is below
the set temperature.
+hr key: Press to set a
suitable temperature
for up to 23 hours (see
step 2).
Select key: Press
to open and save
editor screens
+ & - keys:
Press to change
the current
temperature.
key: Press to
cancel +hr and
display home.
RF transmission indication. The
RF symbol will be visible as
follows,
Short flashes = RF transmission
Continuous flashing = RF signal
issue
6444 Invensys MiStat C 06490192001 IssE.indd 1 27/09/2013 09:22
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