MCZ SELECTA 15HQ S1 User manual

PELLET BOILER
SELECTA 15HQ S1
SELECTA 20HQ S1
SELECTA 25HQ S1
SELECTA 25HQ ACS S1
PART 2 - OPERATION AND CLEANING
Instructions in English
ENINSTALLATION GUIDE

22
CONTENTS
CONTENTS..................................................................................................................2
10  FIRST STARTUP ...................................................................................................3
11  MENU ITEMS AND FUNCTION.................................................................................7
12  SAFETY DEVICES AND ALARMS.............................................................................23
13RECOMMENDATIONS FOR SAFE USE.......................................................................28
14  MAINTENANCE AND CLEANING ............................................................................29
15  TROUBLESHOOTING............................................................................................37
16  ELECTRICAL PLAN...............................................................................................40

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10 - FIRST START-UP
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BEFORE START-UP
GENERAL PRECAUTIONS
Remove all parts that may burn from the brazier and the product’s tank (manual, various adhesive labels or any polystyrene).
The rst start-up may not be successful as the feed screw is empty and does not always manage to load the brazier
with the required amount of pellets in time to light the ame.
CANCEL THE FAILED IGNITION ALARM. REMOVE THE PELLETS LEFT IN THE BRAZIER AND REPEAT THE START-UP.
If after repeated attempts, the ame fails to ignite, despite a regular ow of pellets in the brazier, verify that the brazier is assembled
correctly and must be clean without any ash incrustations. If no anomaly is found during this inspection, there may be a problem
with the product components or installation may not be correct.
REMOVE THE PELLETS FROM THE BRAZIER AND CONTACT AN AUTHORISED TECHNICIAN.
Do not touch the boiler during the rst lighting, as it is during this phase that the paint sets; if you touch the paint,
you may expose the steel surface.
If necessary, touch up the paint with the aerosol spray in the original colour (see‘’Accessories for pellet boilers’’).
It is good practice to guarantee eective ventilation in the room during the initial start-up, as the boiler will emit
some smoke and smell of paint.
ATTENTION!
Please ensure the brazier is clear of ALL pellets and ash build up following any failed ignitions. Failure to clear out
the brazier prior to resetting may result in further failed ignitions or in certain conditions an explosive ignition.
Do not stand close to the boiler and ventilate the room as described. The smoke and smell of paint will disappear after about an hour of
operation, however, they are not harmful in any case.
The boiler will be subject to expansion and contraction during the stages of lighting and cooling down, and may therefore make slight
creaking noises.
This is absolutely normal as the structure is made of laminated steel and must not be considered a defect.
It is extremely important to make sure the boiler does not reach high temperatures straight away, but to increase the temperature
gradually using low power at rst.
DO NOT EXPECT HEATING EFFICIENCY IMMEDIATELY!!!
ATTENTION!
If during operation or initial ignition you encounter combustion smoke spillage in to the room from the
applianceortheuethen please switcho the appliance,ventilatetheroomandcontact theinstallation
/ service technician immediately.

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10 - FIRST START-UP
SETTINGS TO BE CARRIED OUT BEFORE THE INITIAL START-UP
After connecting the power cable to the electrical socket, turn the power switch to the (I) position.To turn the boiler on or o, press button
1 on the control panel for a few seconds.
Switch-on is signalled on the display by the text ON and the ame icon ashing.
The stove goes to power-on, ame standby and start-up status.
When the time required for the power on stages has elapsed, the stove goes to work mode.
When the stove reaches the work mode, the user can set the various SETTINGS available.

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6-LOADING THE PELLETS
The pellets can be loaded either manually or automatically. The empty tank can contain up to 100 litres or 65 kg of pellets.
Manual Loading:
• Open the top door“C”of the boiler directly and pour in the pellets.
Automatic loading (with remote tank of 200/400 or 300 kg - optional - see accessories):
Remove the“V”cap and insert the pellet supply pipe coming from the remote tank.
If the remote tank is topped up using a cistern, the boiler must be switched o at least one hour before being topped up.
Never remove the protective grate from inside the tank. When loading pellets, keep the bag from coming into
contact with hot surfaces.
We point out the installation of the pneumatic extractor/external feed screw (optional) to move the pellets make the
combustible tank lose its airtight features in environments where this is required. Installation of these accessories
could change performance of the boiler respect to that declared by the manufacturer.
AUTOMATIC LOADINGMANUAL LOADING

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SAFETY
WHAT TO DO IF SMOKE LEAKS INTO THE ROOM OR IN CASE OF EXPLOSION DAMAGING THE DEVICE: SWITCH IT OFF, VENTILATE
THE ROOM AND IMMEDIATELY CONTACT THE INSTALLER/TECHNICIAN IN CHARGE OF ASSISTANCE.
User Training
In ALL cases, the technician in charge of installation and rst-start-up MUST carry out a thorough handover of the
appliance to the homeowner / end user. The following elements should be covered to the satisfaction of the end user.
Failure to do this may result in unsafe use of the appliance:
•
• Explanation of the appliance and how it works
• Necessity to maintain ventilation to the appliance and the issues that may arise otherwise
• Fuel usage and supply
• How to light the appliance safely
• What to do in the event of failed ignitions
• What to do in the event of alarms (in particular those generated when the appliance runs out of fuel)
• How to maintain the appliance correctly and the importance of carrying out these tasks each month
• It is good practise to agree a date for the rst annual service
• Discuss the use of secondary heating systems if applicable
• Explain how the remote control or room stats operate and their optimal positioning

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CONTROL PANEL DISPLAY
Menu options
KEY
1. Switching on/switching o the boiler
2. Scrolling down through the programming menu
3. Menu
4. Scrolling up the programming menu
5. Decrease set temperature / programming functions.
6. Increase set temperature / programming functions.
7. Display.
MAIN MENU
Press key 3 (menu) to access.The options accessed are:
1. Date andTime
2. Timer
3. Sleep (only when boiler is on)
4. Settings
5. Info
6. Wi-Fi/Ble
1. Date and time conguration
Congure the time and date as follows:
• Press the“menu”key.
• Select “Date and Time”.
• Press“menu”to conrm.
• Scroll through with the arrow keys and select the variables to be edited one at a time: Day, Hour, Min, Num. day, Month, Year.
• Press“menu”to conrm
• Use the + and - keys to edit.
• Finally, press“menu”to conrm and“esc”to exit.

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2. PROGRAMMED MODE (TIMER) - Main menu
The current time and date must be congured to ensure correct operation of the timer.
There are six congurable TIMERS; for each one, the user can select a start and stop time and the days of the week when it is in use.
When one or more programs are active, the status of the boiler and the TIMER “n” alternate on the display. “n” is the number of timer
programs in use, separated by dashes.
Example:
TIMER 1 Timer 1 program active.
TIMER 1-4 Timer 1 and 4 programs active.
TIMER 1-2-3-4-5-6 All timer programs active.
EXAMPLE OF PROGRAMMING
With the boiler on or o:
• access the MENU,
• scroll to the TIMER item using the <> arrows,
• press the“Menu”key
• the system shows“P1”(Press the <> keys to move through the timers P2, P3, P4, P5, P6)
• Press the“Menu”key to activate“P1”.
• press + - and select“ON”
• press the“Menu”key to conrm
At this point the start time is 00:00. Press the + - key to set the start time and press the“menu”key to conrm.
Next, the proposed stop time is 10 minutes later than the congured start time: press the + key and edit the stop time, and press the
“menu”key to conrm.
Next, you are asked to set the days of the week when the congured timer is to be enabled or disabled. Press the - or + keys to select the
day you want to activate the time. It will light up white, then conrm with the“menu”key. If no day is selected for enabling the timer, the
timer program is no longer enabled on the status window.
Next, program the other days or press“ESC”to exit. Repeat this procedure to program the other timers.
EXAMPLES OF PROGRAMMING
P1 P2
on o day on o day
08:00 12:00 mon 11:00 14:00 mon
Boiler on between 08:00 and 14:00
P1 P2
on o day on o day
08:00 11:00 mon 11:00 14:00 mon
Boiler on between 08:00 and 14:00
P1 P2
on o day on o day
17:00 24:00 mon 00:00 06:00 tue
Boiler on between 17:00 on Monday to 06:00 onTuesday

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NOTES ON USE OF THE TIMER
• The timer always starts the boiler with the last temperature and ventilation settings (or with the default settings at 20°C and V3 if
they have never been altered).
• The start time can be between 00:00 and 23:50
• If the stop time has not yet been saved, the program proposes a start time at +10 minutes.
• If a timer program turns o the boiler at 24:00 on one day and another program starts it up at 00:00 on the next day: the boiler
remains on.
• A program has a start-up and/or shut-down time that overlap the times of another program: if the boiler is already on, the start has
no eect while OFF turns o the boiler.
• When the boiler is on and the timer is active, pressing the OFF key turns o the boiler; the boiler then restarts automatically at the
next time of the timer.
• When the boiler is o and the timer is active, pressing the ON key turns on the boiler; the boiler then stops automatically at the next
time of the timer.
3. SLEEP FUNCTION (main menu)
Sleep may be activated only when the boiler is on and allows you to quickly set a time for the product to turn o.
To set the Sleep function, proceed as follows:
• Enter the MENU
• Scroll to the SLEEP item with the <> arrows
• Press Menu
• Set the turn-o time you want using the + and - keys.
The panel shows a default time of 10 minutes after the current time, which can be adjusted with key 4 up to the following day (i.e. the
turn-o can be delayed for a maximum of 23 hours and 50 minutes).
If the SLEEP function is active with the TIMER active, the former has priority, therefore the boiler will not turn o at the time set in the
timer program but at the time set by the sleep function, even if it comes after the time set by the timer.
ADJUSTMENTS MENU
To access the menu, proceed as follows:
• Press the - + keys
• Scroll with the <> arrows and select“Set Amb. T”or“Set WaterT”or“Exchanger Speed”
• Press“menu”to enter the option selected.
• Change with the + - keys.
• Press“menu”to conrm and“esc”to exit.

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4. SETTINGS MENU
The SETTINGS menu is for conguring use of the boiler:
a. Language.
b. ADAPTIVE mode
c. Cleaning (shown only when boiler is o).
d. Feed screw loading (shown only when boiler is o).
e. Tones.
f. External thermostat (activation).
g. Auto Eco (activation).
h. EcoTurn-o T (default 10 minutes)
i. Pump onT (default 50°C).
j. Auxiliary boiler (default deactivated).
k. Pellet recipe.
l. Smoke rpm var
m. Maximum power (1-5 - default 5).
n. Component test (shown only when boiler is o).
o. “Test Performance”function (can be enabled only when boiler is on, for checking emissions in eld).
p. System conguration (factory settings: system 02).
q. Season
r. Technical menu.
NOTE: Some of the options listed above cannot be enabled in certain“system congurations”.
a - Language
Select the language as follows:
• Press the“menu”key.
• Use the arrow keys to scroll through and select“Settings”
• Press“menu”to conrm.
• Use the arrow keys to scroll through and select“language”.
• Press“menu”to conrm.
• Use the + - keys to select the required language (IT/EN/DE/FR/ES/NL/PL/DA)
• Press“menu”to conrm and“esc”to exit.
b - ADAPTIVE mode
When you access the “Adaptive Mode”menu, you are prompted to enter a password (00 - ZERO/ZERO).
• Press the“menu”key
• the text Only for technicians appears (only in English)
• It is preferable that this mode be activated under the supervision of a qualied technician.
• press“menu”
• scroll with the arrows until the“ON”function activates
• press“menu”to conrm
When this menu is activated, an icon“A”representing the active status of this function must appear on the display (main screen).
c - Cleaning
Allows you to enable/disable the smoke extractor.
Select “Cleaning”(only with boiler o-OFF) as follows:

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• Press the“menu”key.
• Use the arrow keys to scroll through and select“Settings”
• Press“menu”to conrm.
• Use the arrow keys to scroll through and select‘’Cleaning’’
• Press“menu”to conrm.
• Use the + - keys to select“On”.
• Press“menu”to conrm and“esc”to exit.
d - Load feed screw
This is for lling the pellet loading system.This can be enabled only when the boiler is o. A 180”countdown appears.The feed screw stops
automatically at the end of the countdown and the menu closes.
To select“Load feed screw”(only with boiler o-OFF) proceed as follows:
• Press the“menu”key.
• Use the arrow keys to scroll through and select“Settings”
• Press“menu”to conrm.
• Scroll with the arrows and select“Load auger”.
• Press“menu”to conrm.
• With the + - keys, select“Enable”.
• Press“menu”to conrm and“esc”to exit.
e - Tones
Allows you to enable or disable the buzzer when pressing the buttons.
This function is disabled by default.To enable it proceed as follows:
• Press the“menu”key.
• Use the arrow keys to scroll through and select“Settings”
• Press“menu”to conrm.
• Use the arrow keys to scroll through and select‘’Tones’’
• Press“menu”to conrm.
• Use the + - keys to select“On”.
f - External thermostat
EXTERNAL THERMOSTAT (not included with the boiler, it must be provided by the user)
The temperature of the boiler can also be controlled by an external thermostat in the room. It should be positioned centrally in the room
where the boiler is installed. It provides a closer match between the heating temperature requested of the boiler and the actual room
temperature it provides.
Connect the wires of the external thermostat to points 1-2 of the terminal block on the boiler.
Once the thermostat has been connected it needs to be enabled.
To do this, proceed as follows:
• Press the“menu”key.
• Scroll with the arrows to“Settings”.
• Press“menu”to select.
• Now use the arrows to scroll to“External thermostat”.
• Press“menu”to select.
• Press the - + keys.
• Select “On”to activate the external thermostat.
• Press the“menu”key to conrm.
• Press the“esc”key to exit.

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g - Auto-Eco activation
To select the Auto-Eco function, proceed as follows:
• Press the“menu”key.
• Use the arrow keys to scroll through and select“Settings”
• Press“menu”to conrm.
• Scroll with the arrows and select“Auto-Eco”.
• Press“menu”to conrm.
• Use the + - keys to select“On”.
• Press“menu”to conrm and“esc”to exit.
h - Eco Switch-o T
To select the Eco StopT function, proceed as follows:
• Press the“menu”key.
• Use the arrow keys to scroll through and select“Settings”
• Press“menu”to conrm.
• Scroll with the arrows and select‘’T Eco o’’.
• Press“menu”to conrm.
• Enter the minutes with the + - keys.
• Press“menu”to conrm and“esc”to exit.
AUTO ECO MODE
For activation of the“Auto Eco”mode and time settings, see paragraphs 8 f and 8 g respectively.
The‘’ECO stopT’’can be adjusted to ensure correct operation in the various environments in which the boiler can be installed and to avoid
constant stopping and starting when the room temperature is subject to sudden change (drafts, poorly insulated rooms, etc.).
The ECO stop procedure is activated automatically when all the power recall devices included in the“system conguration”are satised:
room temperature probe/external thermostat (congurations 1-2-3), ow switch (conguration 2), thermostat/ntc (10 kΩß3435) puer
(conguration 4-5) or thermostat/ntc (10 kΩ ß3435) boiler (conguration 2-3). If all the devices present are satised, the time begins
to decrease“T ECO stop” (10 minutes default, can be changed in the “Settings”menu). During this phase, the panel alternates between
displaying ON with a small ame and Crono (if active) - Eco active. The minutes counting down to the Eco Stop are shown at the top of the
display. The ame moves to P1 and remains there until the set“T Eco Stop”time reaches zero, and if the conditions are still satised, turns
o the boiler. The ECO stop count is cancelled if one of the devices recalls power.
When the boiler begins to turn o, the panel shows: O - Eco Active - ashing small ame.
When the boiler turns o, OFF-ECO appears on the display with the ame symbol o.
The following conditions have to be met simultaneously for the ECO to restart:
• Power recall
• 5 minutes have passed since shut-down.
• TH2O < TSetH2O.
• If the power is recalled by the domestic hot water (DHW), the 5’are ignored and the boiler starts up as required.
NOTE: In conguration 4 - 5 the Auto Eco mode is enabled automatically. Also when in conguration 2 - 3, with the‘summer’function set,
it is enabled automatically. Where it is prescribed that it should be enabled, the mode cannot be disabled.
i - T Pump On
This option enables adjustment of the pump activation temperature.
Select the Pump On T function as follows:
• Press the“menu”key.
• Use the arrow keys to scroll through and select“Settings”

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• Press“menu”to conrm.
• Scroll with the arrows and select“T Pump On”.
• Press“menu”to conrm.
• Use the + - keys to change the °C.
• Press‘’menu’’to conrm and‘’esc’’to exit.
j - Auxiliary boiler
An additional module (optional) must be installed to allow the start-up of an auxiliary boiler when the main boiler is o or has been
stopped due to an alarm.The default settings have this function disabled.To enable the function, go to the settings menu.
k - Pellet Recipe
This function is for adapting the boiler to the type of pellet in use. As there are many types of pellet available on the market, the operation
of the boiler can vary considerably according to the quality of the fuel. When the pellets clog up the brazier due to excess loading of fuel
or when the ames are high even at low power, or when the ames are low, it is possible to decrease/increase the amount of pellets in
the brazier:
Available values:
-3 = A decrease of 30% on the factory setting.
-2 = A decrease of 20% on the factory setting.
-1 = A decrease of 10% on the factory setting.
0 = No changes.
1 = An increase of 5% on the factory setting.
2 = An increase of 10% on the factory setting.
3 = An increase of 15% on the factory setting.
Edit the recipe as follows:
• Press the“menu”key.
• Use the arrow keys to scroll through and select“Settings”
• Press“menu”to conrm.
• Scroll with the arrows and select“Pellet recipe’’
• Press“menu”to conrm.
• Alter the % with the + - keys.
• Press‘’menu’’to conrm and‘’esc’’to exit.
Attention! The parameters that can be set with this menu substantially modify operation of the boiler.
These settings allow you to improve operation of the boiler based on the pellets used, but, if
set incorrectly, it could endanger safety.
l - Fumes rpm % ventilation
In the event the installation presents problems in extracting smoke (lack of draft or even pressure in the duct), it is possible to increase
the smoke and ash extraction speed.This change resolves all the potential problems related to pellets clogging in the brazier and deposits
forming at the bottom of the brazier itself caused by poor quality fuel or fuel that produces a lot of ash. The extraction speed may be
altered between -30% to +50%, with increments of 10 percent at a time. Negative variation can be necessary if the ame is too low.
To alter this parameter, proceed as follows:
• Press the“menu”key.
• Use the arrow keys to scroll through and select“Settings”
• Press“menu”to conrm.
• Scroll with the arrows and select“Fumes rpm Var.”

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• Press“menu”to conrm.
• Alter the % with the + - keys.
• Press‘’menu’’to conrm and‘’esc’’to exit.
Attention! The parameters that can be set with this menu substantially modify operation of the boiler.
These settings allow you to improve operation of the boiler based on the pellets used, but, if
set incorrectly, it could endanger safety.
m - Maximum power
Allows you to set the maximum power limit of the ames which the boiler can use to reach the set target temperature.
Modify the power as follows:
• Press the“menu”key.
• Use the arrow keys to scroll through and select“Settings”
• Press“menu”to conrm.
• Scroll with the arrows and select‘’Maximum power’’.
• Press“menu”to conrm.
• Change the power from 01 to 05 using the + - keys.
• Press‘’menu’’to conrm and‘’esc’’to exit.
n - Components test
This can be done only when the boiler is o and allows you to select the components to be tested:
• Spark plug: it is turned on for a xed test period of 1 minute during which the panel displays the countdown in seconds.
• Feed screw: it is powered for a xed period of 1 minute during which the panel displays the countdown in seconds.
• Extractor: it is activated at 2500 rpm for a xed period of 1 minute during which the panel displays the countdown in seconds.
• Exchanger: enables you to conduct the test in V5 for a xed period of 1 minute during which the panel displays the countdown in
seconds.
• Pump: it is activated for a xed period of 10 seconds during which the panel displays the countdown.
• 3-way valve: the 3-way valve is activated for a xed test period of 1 minute during which the panel displays the countdown in
seconds.
Enable the“Component test”function (only with boiler o) as follows:
• Press the“menu”key.
• Use the arrow keys to scroll through and select“Settings”
• Press“menu”to conrm.
• Use the arrow keys to scroll through and select‘’Component test’’
• Press“menu”to conrm.
• Use the + - keys to select the test to be carried out.
• Press‘’menu’’to conrm and‘’esc’’to exit.
o - TEST PERFORMANCE Function
This function can only be activated when the boiler is on and power is supplied, and it forces operation with the P1 or P5 parameters.
Any loading/smoke ventilation percentage corrections made remain (“Pellet recipe” menu or Smoke Rpm Var.) During this interval, the
thermostat/puer/room set point/ H20 set point adjustments are not actuated. Only the safety shut-down at 85°C remains active. The
technician can stop this stage at any moment by pressing the on/o key. To activate the“Test Performance”function, proceed as follows:
• Press the“menu”key.

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• Use the arrow keys to scroll through and select“Settings”
• Press“menu”to conrm.
• Use the arrow keys to scroll through and select‘’Test Performance function’’
• Press“menu”to conrm.
• Using the + - keys, select“P1 or P5”
• Press“menu”to conrm
• Press“esc”twice to go back to the main display of the panel
• Press“esc”once to exit the“Test Performance”function
NOTE: It could take up to 5 minutes to reach the selected power (P1 or P5) (refer to power icon)
p - System conguration
This function allows you to set the type of hydraulic system that the product must manage.
To change the conguration of the system, proceed as follows:
• Press the“menu”key.
• Use the arrow keys to scroll through and select“Settings”
• Press“menu”to conrm.
• Use the arrow keys to scroll through and select‘’System conguration’’
• Press“menu”to conrm.
• Use the + - keys to modify the conguration between 01 and 05.
• Press“menu”to conrm and“esc”to exit.
q - Season
In congurations 2 and 3, enabling the‘’summer’’ function disables deviation of the 3-way valve towards the heating system to prevent
the radiators from heating up, and so the ow is always towards the hot water system (DHW).
Selecting the “summer” option automatically enables the auto-eco function (cannot be deactivated). The room temperature probe/
external thermostat are ignored.
Modify the function as follows:
• Press the“menu”key.
• Use the arrow keys to scroll through and select“Settings”
• Press“menu”to conrm.
• Use the arrow keys to scroll through and select‘’Season’’
• Press“menu”to conrm.
• Use the + - keys to select“Summer”or“Winter”.
• Press“menu”to conrm and“esc”to exit.
r - Technical menu
To access the technical menu you must contact the service centre as it requires a password.
Access the“technical menu”as follows:
• Press the“menu”key.
• Use the arrow keys to scroll through and select“Settings”
• Press“menu”to conrm.
• Use the arrow keys to scroll through and select‘’Technical menu’’
• Press“menu”to conrm.
• With the + - keys, select “Product Type”,“Service Hours”, “Parameters”,“DHW Parameters”,“Counter memories”,“Enable fan”, “Puer
menu”,“Adaptive Parameters”and“Max P1 Time”.
• Press‘’menu’’to conrm and‘’esc’’to exit.

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5. INFO MENU
The INFO menu gives you information on the status of the boiler.
The entries are:
• Product type
• Parameter type
• Firmware Version
• SW (time and date)
• Total hours of operation
• total number of ignitions
• Smoke Extractor Rpm
• T smoke
• exchanger voltage (air fan) - if present
• feed screw loading (possibly changing the“Pellet recipe”menu)
• ame

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Technical Dept. - All rights reserved - Reproduction prohibited
SYSTEM CONFIGURATIONS
At the time of installation, the product must be congured according to the type of system by selecting the relative parameter in the
“SETTINGS”menu.
There are 5 possible congurations, described below:
Conguration Description
1 Room temperature control via boiler's on-board probe or by enabling external thermostat FACTORY SETTING
2Room temperature control via boiler's on-board probe or enabling external thermostat; DHW production for
boiler or storage with thermostat (optional).
3Room temperature control via boiler's on-board probe or enabling external thermostat; DHW production with
NTC probe (10 kΩ ß3435).
4 External Puer controlled by thermostat.
5 External Puer controlled by NTC probe (10 kΩ ß3435).
CONFIGURATION 1 (FACTORY SETTING)

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CONFIGURATION 2
CONFIGURATION 3

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CONFIGURATION 4

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CONFIGURATION 5
1 SELECTA 15/20/25HQ
2 HEATING DELIVERY
3 HEATING RETURN
4ZONE VALVE
5 HEATING BODIES
6HOT SANITARY WATER
7DOMESTIC COLD WATER
8SANITARY WATER BOILER
9DIVERTER VALVE
10 BOILER THERMOSTAT
11 THERMOSTATIC MIXER VALVE
12 NTC PROBE 10 kΩ β3434 SANITARY WATER
13 HEATING PUFFER
14 HEATING SYSTEM CIRCULATOR
15 PUFFER THERMOSTAT
16 NTC PROBE 10 kΩ β3434 PUFFER
17 SAFETY VALVE
VTHERMOSTATIC DIVERTER VALVE