geminox THR Series Owner's manual

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1 - DESCRIPTION ...................................................................................................................................... 4
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1 - CHARACTERISTICS............................................................................................................................. 5
2 - PIPE CONNECTION DIAMETERS........................................................................................................ 6
3 - DIMENSIONS........................................................................................................................................ 6
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1 - PRINCIPLE............................................................................................................................................ 7
1.1 - Components .............................................................................................................................. 7
1.2 - Control panel ............................................................................................................................. 8
1.3 - Operating diagram ..................................................................................................................... 9
1.4 - Principle of air/gas servo-control system ................................................................................. 10
1.5 - Air pressure variation procedure ............................................................................................. 10
1.6 - Emission of pollutants .............................................................................................................. 10
2 - THE DIFFERENT VERSIONS OF THE THR ...................................................................................... 10
2.1 - The basic THR model (no outside sensor or room sensor) ..................................................... 10
2.2 - THR with outside sensor only .................................................................................................. 10
2.3 - THR with outside temperature sensor and room sensor ......................................................... 11
3 - FUNCTIONS COMMON TO THE DIFFERENT VERSIONS............................................................... 13
3.1 - Antifreeze function (with QAC31 or/and QAA70) .................................................................... 13
3.2 - Anti-legionella function ............................................................................................................ 13
3.3 - Pump run-on after the end of heating ...................................................................................... 13
3.4 - Bypass valve and pump kick ................................................................................................... 13
3.5 - Boiler overheat protection ........................................................................................................ 13
3.6 - Anti-short burner cycle protection function .............................................................................. 13
3.7 - Functions activated using the control panel ............................................................................ 13
4 - HEAT EXCHANGER/CONDENSER.................................................................................................... 14
5 - . GAS VALVE....................................................................................................................................... 14
6 - DIGITAL DISPLAY............................................................................................................................... 15
6.1 - Normal operation ..................................................................................................................... 15
6.2 - List of display codes ................................................................................................................ 15
6.3 - List of alarm codes .................................................................................................................. 16

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1 - GENERAL............................................................................................................................................ 17
1.1 - Location of boiler ..................................................................................................................... 17
1.2 - Gas supply ............................................................................................................................... 17
1.3 - Flueing ..................................................................................................................................... 17
1.4 - Air supply ................................................................................................................................. 18
1.5 - Water circulation system ......................................................................................................... 18
1.6 - Electrical supply ....................................................................................................................... 18
2 - ANGLE MOUNTING............................................................................................................................ 18
3 - SPACER BACK PLATE (SUPPLIED AS AN OPTION)....................................................................... 19
4 - PLUMBING CONNECTIONS............................................................................................................... 19
4.1 - Pressure/flow rate curves ........................................................................................................ 19
4.2 - Water conditioning in closed multimetal circuits ...................................................................... 20
4.3 - Floor heating installation .......................................................................................................... 20
5 - COMBUSTION PRODUCT FLUEING................................................................................................. 21
5.1 - Evacuation using standard flue (model B23) ........................................................................... 21
5.2 - Evacuation using balanced flue ............................................................................................... 22
5.3 - Evacuation using horizontal balanced flue (model C13) ......................................................... 24
6 - GAS CONNECTIONS.......................................................................................................................... 27
7 - ELECTRICAL CONNECTIONS........................................................................................................... 27
7.1 - Connecting QAC31 outside sensor and QAA70 room sensor options .................................... 27
7.2 - Additional functions ................................................................................................................. 27
7.3 - Wiring diagram ........................................................................................................................ 28
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1 - COMMISSIONING............................................................................................................................... 29
2 - OPERATING PRESSURE CHECK ..................................................................................................... 29
3 - GAS /CO2/CO/NOX FLOW CHECK.................................................................................................... 30
4 - CONVERSION SET............................................................................................................................. 31
4.1 - Conversion from Natural gas H to LPG ................................................................................... 31
4.2 - Conversion from LPG to Natural gas H ................................................................................... 31
4.3 - Adjustment process ................................................................................................................. 31
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1 - ELECTRICAL CONNECTIONS........................................................................................................... 33
2 - HYDRAULIC CONNECTIONS............................................................................................................. 33
3 - OPERATING PRINCIPLE.................................................................................................................... 34
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1 - DECLARATION OF CONFORMITY.................................................................................................... 35

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This is a wall-mounted condensing boiler, with a
heat output, with a closed circuit hot-water heating
boiler, type B23, C13, C33, with a linear power mod-
ulation, and a premixed burner with an air-gas ser-
vo-control system, meeting the PREN 483 (12.97)
and EN 487 (02.94), and PREN 677 (03.96):
- EC type approval N° CE-0085AR0323.
- Gas certification DVGW - VP 112 (01.95)
N° Q 022/003.
- Blue Angel Label.
The power output is controlled by an integrated
electronic regulator according to the heating sys-
tem’s requirements. The gas/air ratio is controlled
by a servo-valve system which maintains the correct
mixture across the full operating range.
A cover with a calm, restrained styling contains the
following components:
- A high performance condensing heat exchanger
made from tubular fins.
- A variable-speed fan (230 V AC - 50 Hz - 39 V
DC) controlled by the regulator.
- A premixed burner with a heat resistant stainless
steel grate.
- A 24 Volt gas valve unit with dual air pressure
valve control.
- A heating circuit safety valve (3 bar).
- A condensate siphon trap.
- “Overheat” safety cut-out with manual reset
(100 °C).
- Water pressure sensor.
- “Flue gas overheat” safety cut-out with manual
reset (85 °C).
- A circulating pump.
- A microprocessor-based control panel for provid-
ing boiler regulation and ensuring smooth run-
ning:
• Flame ionization monitoring.
• Radiator temperature adjustment.
• Pressure display.
• Operating sequence display.
• Fault display.
• On/off switch.

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T°heating Connection Setting
Heat output 30/50 °C
30/50 °C
60/80 °C
60/80 °C
B23
C13/C33
B23
C13/C33
min./max.
min./max.
min./max.
min./max.
kW
kW
kW
kW
10,6/50,5
10,6/47,8
9,5/47,0
9,5/44,5
Max. Heat input kW 10,0/50,0
Efficiency on NCV
Efficiency on GCV
30/50 °C
60/80 °C
30/50 °C
60/80 °C
min./max.
min./max.
min./max.
min./max.
%
%
%
%
106,0/101,0
95,0/94,0
95,4/91,0
85,5/84,6
Gas used
Combustion products temperature °C80
Gas rate combustion products min./max. kg/h 18,0/90,0
Admissible back pressure
(Combustion products) B23
C13/C33 max. Pa Pa 0 100
NOxmg/kWh < 60 (Angel Blue Label)
CO mg/kWh < 50 (Angel Blue Label)
Heating water pressure bar 1/3
Max. Heating water temperature °C75
Boiler water capacity litre 3,8
High
Width
Depth
mm
mm
mm
760
765
355
Weight Without water
With water kg kg 70,0 73,8
Electrical supply/Frequency 230 V (+ 10%, - 15%)/50 Hz
Electrical power consumption
in Heating function min./max.
Indice IP models C13/C33
model B23
W245
IP 44
IP 24
Wall losses at 70 °CW190

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Combustion products: ∅80 (item. 1, fig. 1)
Gas inlet: 1" (item. 2, fig. 1)
Heating flow: 1" (item. 3, fig. 1)
Heating return: 1" (item. 4, fig. 1)
Condensate drain: ∅25 PVC (item. 5, fig. 1)
Pressure relief valve: ∅27 (item. 6, fig. 1)
Possibility of connection for a second heating circuit: 1" (item. 7, fig. 1)
Bottom view
Rear view
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A: Start-up instruction.
I is given by the boiler regulator or by the domes-
tic hot water regulator.
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This time ends as soon as the programmed igni-
tion load is reached.
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Appearance of the ignition arc prior to opening
the gas valve, which occurs at the start of phase
35.
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A flame signal should be present (ionization cur-
rent > 2.8 µA) before the safety time has elapsed.
If this does not occur, another ignition attempt is
made.
 3KDV %&%XUQ URS UDWLRQ
Burner operation following a demand for hot wa-
ter (display 6) or heating (display 7).
 3KDV &'6KXWGRZQ
The change of operating position to standby is re-
ferred to as a “shut-down”and occurs when the
demand for heat disappears. The gas valve clos-
es and the combustion residues are evacuated
by post-ventilation.
 3KDV %ORFNLQJWLP 
Blocking time, for test purposes (about 2 s).
 3KDV &ORVXU WLP 
Time required to arrive at the programmed air
flow rate.
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The fan remains on during the post-ventilation
phase.
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Obligatory passage from the shut-down position
to standby. This phase is also used to bring the
gas control box to the standby position after ex-
ceptional events such as a reset.
ABCD
Readout 90/123456./7. 8
Phase number 60 61 10 30 31 32 33 34 35 36 37 40 50 51 52 53
Heating demand
!
Flame signal
!!
Temp. limiting safety device
Gas valve
Ignition
PWM
Fan speed
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Signal unacceptable
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  3ULQFLSO RIDLUJDVV UYRFRQWUROV\VW P
The THR boiler’s gas valve is controlled by the air
pressure supplied by the fan, thus guaranteeing a
correct air/gas ratio over the whole range of opera-
tion (constant CO2). The ratio remains constant de-
spite any pressure drop in the combustion products
outlet or the air intake. The air-gas link is pneumatic.
  $LUSU VVXU YDULDWLRQSURF GXU
The THR boiler has a 230 volt variable-speed fan; It
is controlled by the regulator, which calculates the
speed needed at any given time to produce the re-
quired pressure.
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The THR boiler is fitted with a high performance pre-
mixed burner.
CO and NOx emissions are within the values laid
down by the most demanding quality standards.
(Blue Angel label).
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Manual adjustment of heating flow and domestic hot
water temperatures (if optional hot water tank in-
cluded) on the boiler control panel.
The heating regulator defines the heat output re-
quired to achieve the heating and hot water settings
entered by the user. These are set using tempera-
ture knobs for the boiler flow and hot water settings.
A winter/summer switch can be used to switch from
hot water only (summer position) to heating and hot
water (winter position).
Whether the switch is set to winter or summer, the
boiler is protected against freezing when the tem-
perature drops below 5 °C.
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Correction of flow temperature and adjustment of
hot water temperature (if optional hot water tank in-
cluded) on the boiler control panel.
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The hot water temperature setting is adjusted using
the hot water temperature control knob on the con-
trol panel.
Winter/summer switch set to the winter position, the
regulator automatically switches between winter
and summer. The boiler provides only hot water
when the average outdoor temperature exceeds
19 °C. Otherwise, the boiler provides heating and
hot water.
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When the winter/summer switch is set to the sum-
mer position, the regulator provides hot water only.
The temperature control knob becomes inactive; In
effect the heating flow temperature is regulated as a
function of the real outdoor temperature conditions.
This is achieved using the heating curves integrated
into the regulator itself.
The slope of this curve is preset to an average val-
ue, but can be corrected using the heating knob and
button C (both located on the control panel) to cor-
rect it to warmer or cooler (shifted parallel).
Once this parameter has been set, your heating sys-
tem becomes completely independent1and will pro-
duce ambient temperatures that are finely
calculated to give the optimum operating yield.
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The heating curve slope is factory-preset to 1.5 to
cater for heating by radiator.
This value needs to be changed to 0.8 when used
with floor heating:
- Press the three buttons A, B and C simultaneous-
ly until a IODVKLQJ/ appears on the display, fol-
lowed by a IODVKLQJ,,.
The slope has now been corrected. It is however
possible to refine the following parameters accord-
ing to the precise needs of the installation (see
§2.2.2.3 - III - OPERATION) by increasing or reduc-
ing the temperature setting by a few degrees.
  5DGLDWRUK DWLQJ
The factory settings correspond to heating by radia-
tor. The characteristics of the building (e.g. insula-
tion, heating surface) may mean that the setting
need adjusting in order to obtain a higher or lower
level of heating. This involves modifying the heating
curve parameters (see §2.2.2.3 - III - OPERA-
TION).
  0RGLI\LQJSDUDP W UV
Adjust the heating knob to the right to obtain a
warmer temperature setting (room temperature
warmer) (max. + 3 °C) and to the left for a cooler set-
ting (max. - 3 °C). Press button &until an )appears
on the display (about 3 s). The parameters have
now been adopted by the system.
If the radiator temperature setting needs to be in-
creased by more than 3 degrees, this operation can
be repeated, but first wait for 10 minutes to allow the
regulator time to register the new parameters prop-
erly. The inherent inertia in buildings and their heat-
ing systems means that it may take several hours to
react to a change, so it is better not to change this
parameter too often.
To return to the standard parameters, press the
three buttons $, %and &simultaneously until an /
appears on the display.
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All the controls, settings, overrides and corrections
for heating flow/hot water temperatures (if optional
hot water tank included) can be carried out using the
room sensor.
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This version is designed to provide optimum com-
fort. As well as the functions linked to the outside
sensor described for the model above, the system
also has a room sensor.
This QAA70 room sensor provides the following
functions:
-Compensation for ambient conditions.
- The ability to programme three daily periods for
heating or hot water.
- A easy programme override to switch the system
off either momentarily or for longer periods (e.g.
holidays).
1. The heating flow temperature varies automatically accor-
ding to the outside temperature.
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-An ambient temperature setting for each pro-
grammed period.
-A setting for the hot water temperature.
-A display showing the time, the outside tempera-
ture, the ambient temperature, the boiler temper-
ature, the hot water temperature and indicating
the presence of any faults on the boiler system.
- The ability to anticipate and defer water heating:
The hot water tank will start being fed with hot wa-
ter one hour before the heating period and this
will continue until 10 minutes after the end of this
period. When a demand for domestic hot water is
made during a period of reduced heating, the
boiler systematically ensures that the water is at
the hot water temperature setting.
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Fitting the QAA70 module on the boiler cancels the
functions of the heating and hot water temperature
knobs on the boiler control panel. The expected
temperatures must be set on the QAA70 sensor
(see separate technical instructions).
  :LQW UVXPP UVZLWFK
When the winter/summer is switch set to the winter
position, the boiler can switch automatically from
winter to summer operation. Summer operation is
active when the outside temperature measured over
the previous 24 hours exceeds the set point by 1 °C,
i.e. it reaches 20 °C. When summer operation is ac-
tive it can be overridden temporarily by pressing si-
multaneously the and buttons on the
QAA70.
The system also automatically returns to summer
operation, this time when the outside temperature
measured over the previous 24 hours is at least 1 °C
less than the set point, i.e. below 18 °C. The 19 °C
set point can only be changed by using the AZW75
interface.
When the winter/summer switch is set to the sum-
mer position, the regulator provides hot water only
(if the boiler has a hot water tank).
Buttons A, B and C operate on the integrated regu-
lator and are used to access special functions com-
mon to all versions.
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IXQFWLRQ
This function can be used to correct the boiler flow
temperature according to the real ambient tempera-
ture measured by the QAA70 sensor. The function
should be activated or deactivated when the boiler
is commissioned depending on the position of the
sensor. The function should be inactive if any of the
following apply: if the QAA70 is placed outside the
heated space or in a room with another heating sys-
tem, or if it is exposed to sunshine, or if thermostatic
valves are set on the radiators in the room where the
QAA70 is fitted. When the ambient conditions com-
pensation function is inactive, the QAA70 becomes
a remote control acting on the heat curve to cater for
the drop in temperature from daytime to night-time.
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IXQFWLRQ
Press buttons $and &simultaneously for 5 sec-
onds until the symbol appears on the display.
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WLRQIXQFWLRQ
Press buttons $and &simultaneously for 5 sec-
onds until the symbol appears on the display.
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This function automatically corrects the heating
curve based on a measurement of the real ambient
temperature. The corrected loss can be read via the
AZW75 “apprentice parameters”interface.
The function should not be active in the installation
situations described above for the ambient condi-
tions compensation.
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Press buttons %and &simultaneously for 5 sec-
onds until the symbol appears on the display.
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Press buttons %and &simultaneously for 5 sec-
onds until the symbol appears on the display.

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Antifreeze protection for the boiler: When boiler tem-
perature is below 5 °C the burner and the heating
circuit pump are switched on. When the temperature
increases and exceeds 15 °C the burner is discon-
nected and the pump continues to circulate for
10 mins.
Antifreeze protection for the installation: The heating
pump starts operating automatically either intermit-
tently or continuously depending on whether the ex-
ternal temperature is under 1.5 °C or under -10 °C.
Antifreeze protection for the house : When the boiler
is equipped with a QAA70. Protection is provided by
maintaining ambient temperature at a minimum of
5°C.
Antifreeze protection for domestic hot water: When
hot water production has shut down, a minimum
temperature of 4 °C is guaranteed by the regulator.
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To provide a degree of protection against the devel-
opment of pathogenic bacteria in the hot water tank
during prolonged shut-downs, the domestic hot wa-
ter needs to be heated once a week to above 60 °C.
The anti-legionella function is used for this purpose.
It heats the hot water storage tank once a week to
an “anti-legionella”temperature of 65 °C.
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When heating ends, the circulating pump remains
on for a further 10 minutes.
In hot water storage systems, when water heating
ends, the circulating pump remains on until the boil-
er temperature drops below 70 °C. During this pump
run-on period, the by-pass valve remains in the “do-
mestic hot water feed”position.
  %\SDVVYDOY DQGSXPSNLFN
If during shut-downs either the heating circuit has
not operated or the bypass valve has not been
switched for more than about 24 hours, these are
activated for a period of about 5 seconds.
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The regulator incorporates a temperature control
function; This can switch off the burner when the
temperature of the water in the boiler reaches the
maximum of 85 °C. The circulating pump remains
on until the real temperature of the water in the boil-
er drops below 79 °C. The burner is then allowed to
start up again.
A boiler overheat protection also exists.
When the safety thermostat activates, the heating
circuit circulating pump and the fan motor are
switched on for 10 minutes. The bypass valve
switches to the “heating”position.
This second safety system requires a manual reset
and generates an alarm on the boiler. The reset but-
ton has to be pressed to return to normal operation.
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The minimum time that the burner can operate is set
to 60 seconds.
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When using liquefied gas, the system can be adapt-
ed at output ST9 to use an external solenoid safety
valve.
Index 5 signalling output is programmed as follows:
Output ST9 is on from phase 30 (fan speed rise
time) to phase 50 (regulator ends heat demand).
Supply: AC - 230 V + 10 % / - 15%
I < 1,0 A ; cosϕ> 0,8
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The sweep function is activated by pressing %for at
least one second, i.e. when a demand for heating is
made so that the system comes on. The regulator’s
internal “on-off”functions remain inactive in this sit-
uation. The heating then operates at maximum heat
output until the temperature controller responds (to
take the sweep function flue gas measurements).
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Pressing $and %for at least one second activates
the TÜV function, i.e. the internal regulator/temper-
ature controller function becomes inactive. The
heating then operates at maximum heat output until
the safety temperature limiter responds (STB). Re-
leasing either of the two buttons interrupts the TÜV
function.
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Pressing $only for at least 3 seconds activates the
“regulator stop”function. This allows the fan speed
(and therefore the heat output) to be adjusted man-
ually on the hot water setting potentiometer (e.g. for
adjusting the gas orifice, etc.). The boiler then oper-
ates in its heating regime; the internal “on-off”regu-
lator and the temperature controller function are
active.
The regulator off function is ended by pressing the
button again or by switching off the burner.
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An oversized heat exchanger/condenser, with a wa-
ter-cooled combustion chamber in its upper part,
combines the functions of a heat exchanger and
condenser.
Condensation occurs on the tube walls where the
temperature is below the dew point for the combus-
tion products.
Efficiency curve at high/low setting:
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The ALARM LED remains off, the segment display
flashes. If several signals occur, the code with the
highest priority is displayed.
'LVSOD\ 0 DQLQJ
0 Awaiting demand for heating or hot water
1 Shunt 6 not present switch open
2-3 Fan speed rise time/Preventilation
4 Pre-ignition - Ignition
5 Flame presence verification
6 Burner operating on hot water
7 Burner operating on heating
8 End of demand for heating or hot water, post-ventilation
9 Return to initial position, reinitialise gas control box parameters (fan off)
'LVSOD\ 0 DQLQJ 3ULRULW\
1 Boiler potentiometer setting absent 1
2 Hot water potentiometer setting absent 1
4TÜV function active 1
5 Sweep function active 1
7 Regulator off function active 1
8 Domestic hot water sensor 1: Circuit broken 1
0 Domestic hot water sensor 1: Short circuit 1
A Anti-legionella function active 2
C Sweep button closed after RESET/Unlock 1
dTÜV button closed after RESET/Unlock 1
E Forced intermission active 2
F Warmer/cooler correction executed 1
L Revert to standard values 1
P Q1 heating circuit pump kick active 2
U Q3 hot water pump or bypass valve kick active 2

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Display flashes (item. 4, fig. 3)/led on (item. 6,
fig. 3).
All other codes result from internal faults.
'LVSOD\ )DXOW 3RVVLEO FDXV VROXWLRQ
0Incorrect fan speed during
preventilation phase Check parameter DA3
2Overheat thermostat or flue gas
thermostat activated Check water pressure and flow (Pmin. = 1 bar). Purge the installation correctly
4
Flame fault or premature flame signal - The flame does not appear: no gas, gas valve will
not open, significant gas valve adjustment error,
defective HT transformer, HT lead, or HT
electrode
- The flame only appears for 3 seconds: Live/
neutral reversed, defective ionization probe or
ionization probe lead
5 Incorrect fan speed at maximum load Check parameter DA4
6 Fan speed rise time too long Check that the fan is able to rotate freely
9
A
Maximum fan speed exceeded during
preventilation phase - Check mains voltage (too high)
- Check that neither the flue nor the fan air inlet are
blocked.
-CheckparameterDA.
H Boiler sensor circuit broken Replace boiler sensor
L Boiler sensor circuit broken Replace boiler sensor
CBoiler water pressure too low - Check the water pressure in the heating circuit
- Check that the pressure sensor is working -
accessed by removing the plastic cover.

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Installing a wall-mounted gas boiler presents no par-
ticular difficulty.
The installation of the boiler must be carried out by
a competent person in accordance with the relevant
requirements of the Gas Safety (Installation and
Use) Regulations, Building Regulations, Model Wa-
ter Byelaws and the Building Standards (Scotland)
Regulations. It must also comply with the current
I.E.E. Wiring Regulations and the relevant recom-
mendations of the following British Standard Codes.
Regulations and the relevant recommendations of
the following British Standard Codes of Practice:
- CR331.3
Low pressure installation pipes.
- BS.5449.1
Forced circulation hot water systems.
- BS.5546
Installation of gas hot water supplies for domestic
purposes.
- BS.5440.1
Flues (for gas appliances of rated input not ex-
ceeding 60 kW).
- BS.5440.2
Air supply (for gas appliances of rated input not
exceeding 60 kW).
- BS.6798
Boilers of rated input not exceeding 60 kW.
Note
- The boiler is only suitable for installation in a
sealed system and must not be used with an
open vented system.
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The boiler can be installed on the inner face of an
extemal wall - and some intemal walls - providing
they are flat, vertical and capable of adequately sup-
porting the weight of the boiler and any ancillary
equipment.
The boiler may be installed in any room or intemal
space, although particular attention is drawn to the
requirements of the current I.E.E. Wiring Regula-
tions and, in Scotland, the electrical provisions of
the Building Regulations applicable in Scotland with
respect to the installation of the boiler in a room or
intemal space containing a bath or shower. Where
installation is in a room containing a bath or shower,
any electrical switch or boiler control utilizing mains
electricity should be situated so that it cannot be
touched by a person using the bath or shower.
Where installation will be in an unusual location,
special procedures may be necessary and BS.6798
gives detailed guidance on this subject.
A compartment used to enclose the boiler 0867be
designed and constructed specially for this purpose.
An existing cupboard or compartment may be used
provided it is modified for the purpose. Details of es-
sential features of cupboard/compartment design,
including airing cupboard installations, are given in
BS.6798.
In sitting the boiler, the following limitations 0867
be observed:
- The position selected for installation 0867allow
adequate space for servicing in front of the boiler
and for air circulation around the boiler.
- This position 0867also permit the provision of a
satisfactory balanced flue termination.
Note:
- If the boiler is to be fitted in a timber framed build-
ing, it should be Jitted in accordance with the Brit-
ish Gas publication "Guide for Gas Installations in
Timber Frame Housing". Reference DM2. If in
doubt, advice must be sought from the Local Gas
Region of British Gas.
When sitting the boiler, provision must be made for
the disposal of the condensate, see Section 4 -Con-
densate drain.
The pressure relief valve connection should be rout-
ed to an extemal, visible point where the discharge
of steam or water cannot create a hazard to persons
or property. BS.5449: 1 refers.
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Installation pipes should be fitted in accordance with
CP.331.3.
The complete installation must be tested for sound-
ness and purged in accordance with CR331.3.
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Detailed recommendations for flueing are given in
BS.5440.1. The following notes are intended for
general guidance.

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Detailed recommendations for air supply are given
in BS.5440.2. The following notes are intended for
general guidance.
Where the boiler is to be installed in a room or inter-
nal space, the boiler does not require the room or in-
temal space containing it to have a permanent air
vent.
Where the boiler is to be installed in a cupboard or
compartment, permanent high and low level air
vents are required for cooling purposes in the cup-
board or compartment. Both vents must communi-
cate with the same wall to outside air.
The minimum effective area of the permanent air
vents required in the cupboard or compartment are
given in next Table "air vent areas".
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Detailed requirements are given in BS 5440.2.
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The expansion vessel is suitable for systems up to
OLWU Vwater content. For systems in excess of
this capacity an additional pressurized expansion
vessel will be required. BS7074 and "British Gas
Specifications for Domestic Wet Central Heating
Systems" Part 3 gives guidance in this subject.
The central heating system should be in accordance
with the relevant recommendations given in
BS.6798 and, in addition, for small bore and mi-
crobore systems - BS.5449.1. The domestic hot wa-
ter system, if applicable, should be in accordance
with the relevant recommendations of BS.5546.
Copper tubing, to BS. 287 1. 1, is recommended for
water carrying pipework.
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Wiring extemal to the boiler must be in accordance
with the I.E.E. Wiring Regulations and any local reg-
ulations.
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The spacer back plate allows the pipes to be fed
through behind the boiler when they arrive from
above.
Assembly:
- Fit the angle mounting to the wall (supplied with
the boiler).
- Hang the spacer back plate on the angle mount-
ing.
- Hang the boiler on to the spacer back plate.
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Accessories to be connected:
-Expansion vessel (an option) precharged to
0.5 bar suitable for an installation up to 100 litres.
(For more than 100 litres provide for additional
expansion).
- Heating system safety pressure relief valve for
connecting to the waste water outlet via a funnel
and siphon trap.
-Condensate drainage siphon trap for connect-
ing via Ø25 PVC pipe to the waste water outlet
via a funnel and siphon trap. When installing the
system, don’t forget to fill the siphon traps with
water before commissioning. These should be in-
spected twice a year.
-Acirculating pump with an air vent. The silicon
tube from the purger should be slid inside the fun-
nel.
The heating flow and return pipes must be fitted with
stop valves so that work can be carried out on the
boiler if required without draining the installation.
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The power delivered by the boiler depends on the
water flow rate through the exchanger. This can be
set to between 1200 and 2500 litres/hour according
to the installation’s rated power output.
To ensure that heat transfer operates correctly and
to avoid any risk of boiling, never use a flow rate of
less than 1200 litres/hour.
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A water conditioning product is supplied with the
boiler.
This must be added to the heating circuit when the
installation is filled with water. INIBAL: dose = one li-
tre to one hundred litres. If the installation is not
new, ALWAYS flush out the system using clear wa-
ter before finally filling it.
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This THR boiler model cannot be fitted for use in a
floor heating system (unless it is installed with an in-
dependant electronic control)
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To operate the THR with outside sensor as part of a
floor system, the internal regulator parameters have
to be changed when commissioning the system.
This modification is explained in §2.2.2 - IV - IN-
STALLATION. Incorrect changes to these parame-
ters may cause damage to the installation.
A safety device has to be fitted in order to comply
with the regulations. This manual reset device,
which is independent from the regulation system,
must cut off the heat supply and should function
even in the absence of power or motor fluid. The
connection of a switching device to connector No. 6
of the control box satisfies this requirement.
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Installing this type of boiler as part of a floor heating
system imposes the same constraints as for the pre-
vious version, namely that the internal regulator pa-
rameters have to be changed (§2.2.2 - IV -
INSTALLATION) and an independent safety device
has to be fitted.
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