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710 MINISIT
MULTIFUNCTIONAL
GAS
CONTROL
Main features
The 710 MINISIT is suitable for
use with stoves, boilers, catering
equipment and room heaters.
Thermoelectric flame supervision device.
Pressure regulator.
Temperature control.
Subject to change without notice
Application
Normative Reference
9.955.881 03
EN 126
Multifunctional devices for gas
burning appliances.
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VALVE DESCRIPTION
TH
PR
GAS
INLET
MAIN
BURNER
FL
MS
GM
PILOT
BURNER
FLP
RQP
Fig. 1: version with pressure regulator.
RQ
GAS
INLET
TH
MAIN
BURNER
FL
MS
GM
PILOT
BURNER
FLP
RQP
Fig. 2: version with flow adjuster.
710 MINISIT is a multi-functional control incorporating thermoelectric flame supervision device
with restart interlock, pressure regulator or flow
adjuster, modulating thermostat with snap
acting on-off function.
With reference to the schematic blocks in Fig. 1
and Fig. 2:
FL is the inlet filter.
MS is the operation push button.
GM is the thermoelectric flame supervision
device.
FLP is the pilot filter.
RQP is the pilot flow adjuster.
PR is the pressure regulator.
RQ is the main gas flow adjuster.
TH is the modulating thermostat with on/off function with temperature selecting knob.
Ignition button
Inlet pressure test point
Shut-down button
10
Outlet pressure test point
Piezo-electric ignition button
11
Thermocouple connection
(optional)
12
Pilot outlet
Temperature setting knob
13
Gas inlet
Pilot flow setting screw
14
Main gas outlet
Minimum flow setting screw
15
Bottom gas outlet
Maximum flow setting screw
16
Flange fixing holes
(versions with flow adjuster)
17
Mounting holes
Oulet pressure setting screw
18
Thermostat bulb
(versions with pressure regulator)
17
5 8
10
14
9
18
2
13
14
16
15
1
Fig. 3: version with pressure regulator
and piezo-electric igniter.
11
Fig. 4: version with flow adjuster
and piezo-electric igniter.
12
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GENERAL DATA
CONSTRUCTION CHARACTERISTICS
Aluminium alloy body
Inline inlet and outlet (straight and elbow flange
available)
Bottom outlet (optional)
Pilot gas rate adjuster
Pressure regulator or as an alternative flow adjuster
Inlet and outlet pressure test points (optional)
Inlet and pilot filters
Piezo-electric igniter (optional)
Four mounting holes
USE SPECIFICATIONS
Mounting position
Gas families
Ambient temperature
Maximum inlet pressure
Bending and torsion resistance
any
I, II and III
0...80 C
50 mbar
Group 2
MECHANICAL CONNECTIONS
Gas inlet and outlet
Pilot outlet
Thermocouple connection
Pressure test point
Flange fixing holes
Mounting holes
Rp 1/2 or Rp 3/8 ISO 7
M10x1 for tube 6, 4 mm, 1/4
M9x1 or M10x1
9 mm
M4 x 7 mm
6.5 mm
FUNCTIONS
FLAME SUPERVISION
Number of cycles expected
Ignition time (*)
Shut-off time (*)
5.000
< 10 s
< 60 s
(*) using SIT series 200 or 290 thermocouple.
PRESSURE REGULATION
Direct pressure regulator
Class B
Outlet pressure setting range (optional)
3...18 mbar (15...30 mbar)
Built-in cutout device to exclude the pressure regulator (if necessary)
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THERMOSTAT DATA
b
8 - 33
13 - 31
13 - 38
13 - 48
21 - 46
30 - 100
40 - 72
40 - 80
100 - 340
3
2
3
4
3
9
5
5
30
3
2
3
4
3
9
5
5
30
2
2
2
3
2
5
3
3
10
MIN position
MAX position
rated flow rate
A-B
sensor
temperature
a
Data refer EN 126 standard:
a: temperature differential
b: foot
c: modulating band
All the values are expressed in C
Other ranges are available on request
CAPACITY
FLOW RATE Q AS A FUNCTION OF PRESSURE DROP P
Q [m3/h d=0.6]
6
Gas family
I d=0.45
3.9 m /h
5 mbar
II d=0.6
3.5 m3/h
5 mbar
III d=1.7
4.4 m3/h
5 mbar
4
2
0
5
10
p [mbar]
REGULATED FLOW RATE Q
Q = [m 3/h d=0.6]
8
6
2L
Inlet pressure range (mbar)
4
Gas family
2H
2L
Nominal
20
25
Maximum
25
30
Minimum
17
20
Outlet pressure tolerance +10% -15%
2H
2
0
10
12
14
16
Pu [mbar]
18
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FUNCTIONAL DESCRIPTION
710 MINISIT has a magnet unit safety valve and a modulating valve in series. When the ignition
button is pressed, the main flow valve closes the gas flow and the magnet unit opens the pilot gas
flow. The thermocouple, heated by the pilot flame, generates sufficient current within a few
seconds to keep the magnet unit energized.
The main gas flow is opened when ignition button is realeased. With the temperature setting
knob it is possible to set the desired temperature. The thermostat bulb controls the main gas flow
by means of the snapping valve and the modulating valve of the thermostat. These adjust gas flow
to the main burner so as to mantain the desired ambient temperature.
It is possible to measure the inlet pressure and the outlet pressure on the respective pressure test
points.
The pressure regulator due to a single diaphragm system allows improved performance of outlet
pressure regulation. The outlet pressure can be adjusted by a screw.
Pilot flow
adjuster
Shut-down button
Temperature
setting knob
Ignition button
Minimum
adjuster
Main flow
valve
Snapping
valve
Gas inlet
Modulating
valve
Main gas outlet
Inlet filter
Magnet unit
safety valve
Pilot filter
Thermostat
bulb
Version
with
pressure
regulator
Outlet pressure
adjuster
Version
with flow
adjuster
Maximum adjuster
Bottom gas outlet
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OPERATION
Ignition
Press button
and keep it depressed (Fig. 5).
Light the pilot burner and wait a few seconds. If the valve is fitted with
a piezo-electric igniter, press button
to light the pilot burner (Fig. 6).
Release button
and check that the pilot flame stays on, otherwise
repeat the ignition procedure.
Fig. 5
Normal operation
Set knob to the temperature required.
The maximum temperature setting is obtained by turning the knob fully
anti-clockwise (Fig. 7).
Fig. 6
Pilot position
Turn knob fully clockwise.
Fig. 7
Shut-down
Press button
Fig. 8
CAUTION: The re-start interlock device prevents the appliance from reigniting until the flame supervision device has interrupted the gas flow.
After this stage (i.e. when the magnet unit has closed) it is possible to
re-ignite the appliance.
right down (Fig. 8).
SETTINGS AND ADJUSTMENTS
A
Setting the thermostat
The thermostat is calibrated and sealed at the factory.
Re-calibration is not authorised as it may adversely affect the
performance of the appliance to which it is fitted and will also
invalidate warranty.
Low fire adjustment
Turn the MIN screw clockwise to decrease the flow,
anti-clockwise to increase it (calibrated screws available on
request).
Adjusting pilot gas flow
Turn the relevant screw clockwise to decrease the flow or
anticlockwise to increase it.
Adjusting the outlet pressure
Adjusting the outlet flow
(Versions with pressure regulator)
Remove the safety cap.
Turn the screw (B) clockwise to decrease the flow or
anticlockwise to increase it.
B
Adjusting the outlet flow
Adjusting the outlet pressure
(Versions with pressure regulator)
Remove the cap and turn the setting screw (A) clockwise to
increase the outlet pressure or anticlockwise to reduce it.
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Putting pressure regulator out of function
For MINISIT operation on third family gases ensure:
The MIN screw is replaced by a pre-drilled version MIN
screw as specified by the appliance manufacturer. This
screw must be screwed fully home.
MIN
The pilot adjusting screw is un-screwed two turns from
the fully closed position.
Pressure regulator adjustment screw is screwed fully
clockwise or if an output flow adjuster is fitted, it is
screwed fully anticlockwise, so that they are
non-operable thereby enabling the gas supply regulator
to be ineffective.
Low fire adjustment
All the detailed guidelines for installation are given in the use and installation
instructions code 9.956.710.
DIMENSIONAL DRAWING
NOTE: All the dimensions are expressed in millimeters.
SIT La Precisa S.p.A.
Viale dellIndustria 31-33
35129 PADOVA - ITALY
Tel. +39/049/829.31.11, Fax +39/049/807.00.93
www.sitgroup.it - e-mail: mkt@sitgroup.it
