TECH ST-37 Assembly instructions

ST-37 Instruction Manual
TECH
Declaration of Conformity No. 4/2004
Hereby we declare under sole responsibility that the ST-37
230V 50Hz thermoregulator manufactured by TECH ul. St.
Batorego 14 34-120 Andrychów is compliant with the
Regulation by the Ministry of Economy. (Journal of Laws Dz.
U.03.49.414) of 12 March 2003 implementing provisions of
the Low Voltage Directive (LVD) 2006/95/EC and the
Regulation by the Ministry of Infrastructure (Journal of Laws
Dz.U.03.90.848) of 2 April 2003 implementing provisions of
the Directive 2004/108/EC.
The ST-37 controller has been tested for electromagnetic
compatibility (EMC) with optimal loads applied.
For compliance assessment harmonized standards were used:
PN-EN 60730-2-1:2002.
The product was CE-marked for the first time on: 1 December
2004
Co-owners:
Paweł Jura Janusz Master
Andrychów 1 December 2004
- 2 -

TECH
ATTENTION!
ELECT IC CU ENT!
Make sure the regulator is unplugged before
working on the power supply (cable
connections device installation etc.)!
All mounting works must only be carried out
by qualified electricians.
Before activating the controller measure the
electric motor resetting efficiency check the
boiler and inspect wire insulation.
- 3 -

ST-37 Instruction Manual
I. Description
The ST-37 temperature regulator is used for controlling the water circulation
pump hot consumption water pump blow (fan) and fuel feeder.
If the furnace temperature is lower than the setpoint temperature the
regulator is operated in its duty cycle i.e. the blow is active and the
operation time of the fuel feeder is set by the user (both operation and
stand-by time is set).
If the furnace temperature is equal to or higher than the setpoint
temperature the regulator is operated in its sustain cycle.
In each case the software version is customized to the furnace
manufacturer’s requirements. Please send all comments on the software to
the boiler manufacturer.
Your controller should be set according to your individual needs depending on
the type of fuel and boiler used. TECH shall not be held responsible for
incorrect settings.
- 4 -
Return from
menu resetting
Enter submenu
confirm
Plus Minus
Hot
Consumption
Water Pump
Central
Heating
Pump
Blow
Feeder
Alarm

TECH
II. Regulator Functionality
This chapter describes regulator functionality how to change settings and
navigate in the menu.
II.a) Main Page
During normal operation the LCD display shows the main page with the
following data:
Boiler temperature
Setpoint temperature
With the display you can instantly change the setpoint temperature with
PLUS and MINUS. Pressing OPTIONS will move you to the first level. The
display shows the first two lines of the menu. To navigate in each menu use
PLUS and MINUS. Pressing OPTIONS will move you to the next submenu or
will enable an option. Pressing EXIT will move you to the home menu. When
the main page is displayed pressing (and holding) EXIT will inform you
whether the hot consumption water pump is on or off.
II.b) Manual Mode
For your convenience the regulator has a manual mode module. In this
mode each individual element is enabled and disabled independently of the
other.
- 5 -
22oc 56oc
C.H. ON
22oc 56oc
C.H. ON
Feeder
BLOW
Manual Mode
Feed Time

ST-37 – Instruction Manual
Pressing OPTIONS will enable the fuel feeder. The feeder will operate until
OPTIONS is pressed again.
Press OPTIONS to enable / disable the blow.
Press OPTIONS to enable / disable the central heating pump.
Press OPTIONS to enable / disable the (water heater) hot consumption water
pump.
Press OPTIONS to enable / disable the alarm.
II.c) Feed Time
- 6 -
BLOW
C.H. Pump
00 min 20 sec
Feed Time
C.H. Pump
H.C.W. Pump
22oc 56oc
C.H. ON
Manual Mode
Feed Time
H.C.W. Pump
Alarm
Feeder
BLOW
F D R
BLOW

TECH
With this function you can set the operation time for the fuel feeder. Set the
operation time according to the type of fuel and boiler used.
II.d) Feed Interval
With this function you can set the stand-by time for the feeder depending on
the type of fuel used in the boiler. Incorrect operation and stand-by times
may cause the boiler to malfunction i.e. inability to burn all carbon and to
reach the setpoint temperature. Setting correct times will ensure correct
boiler operation.
II.e) Fan Operation in Sustain Mode
With this function you can set the blow time in the sustain mode.
II.f) Fan Interval in Sustain Mode
- 7 -
22oc 56oc
C.H. ON
Feed Time
Feed Interval
00 min 40 sec
Feed Interval
22oc 56oc
C.H. ON
Feed Interval
Fan Sustain Duty
00 min 10 sec
Fan Sustain Duty
22oc 56oc
C.H. ON
Fan Sustain Duty
Fan Sustain Pause
30 min 00 sec
Fan Sustain Pause

ST-37 – Instruction Manual
With this function you can set the blow interval in the sustain mode.
The two menus are used for regulating the furnace while in the sustain
mode. This is to prevent damping of the furnace when the boiler temperature
is over the setpoint value.
ATTENTION: Incorrect settings may cause a continuous increase of the
temperature! In particular interval in the sustain mode should not be too
short and operation in the sustain mode should not be too long.
II.g) Feeder
With this function you can disable or enable the fuel feeder depending on its
condition (e.g. in order to damp the boiler).
II.h) Blow
With this function you can disable or enable the blow depending on its
condition (e.g. in order to damp the boiler).
- 8 -
22oc 56oc
C.H. ON
Fan Sustain Pause
Feeder
On *
Off
22oc 56oc
C.H. ON
Feeder
Blow
On *
Off

TECH
II.i) Pump Switch on Temperature
With this function you can set the temperature that will activate the central
heating pump and the hot consumption water pump (the temperature is
measured on the boiler). Below the setpoint temperature the pumps are
disabled; above the setpoint temperature the pumps are enabled but their
operation is based on the settings i.e. the pumps are enabled alternately (see
the pump priority function or fixed central heating pump)
II.j) Central Heating Hysteresis
With this function you can set the hysteresis of the setpoint temperature.
This is a difference between the temperature of entering into the sustain
cycle and the temperature of returning to the duty cycle (e.g.: when the
setpoint temperature is set to 60°C and the hysteresis is set to 3°C entering
into the sustain cycle will be effected after the temperature reaches 60°C
whereas return to the duty cycle will be effected after the temperature drops
to 57°C).
- 9 -
22oc 56oc
C.H. ON
Blow
Pump Activ Temp
35 oc
Pump Activ Temp
Pump Activ Temp
C.H. Hysteresis
22oc 56oc
C.H. ON
2 oc
C.H. Hysteresis

ST-37 – Instruction Manual
II.k) Hot Consumption Water Hysteresis
With this function you can set the hysteresis of the setpoint temperature on
the water heater. This is a difference between the setpoint temperature
(required by the water heater) and the actual temperature on the boiler (e.g.:
when the setpoint temperature is set to 55oC and the hysteresis is set to 5oC.
After reaching the setpoint temperature i.e. 55°C the hot consumption water
pump is activated causing the central heating pump to be activated. The hot
consumption water pump will be activated again when the temperature drops
to 50°C).
II.l) Blow Force
With this function you can control the fan speed. The adjustment range is 1-
10 (referred to as gears). The higher the gear the higher the speed with the
1st gear being the minimum and the 10th being the maximum speed of the
fan.
Fan speed can be adjusted with PLUS and MINUS. Initially the fan runs
always at full speed so that it is possible to start the fan with the motor being
slightly dusty.
- 10 -
22oc 56oc
C.H. ON
H.C.W. Hysteresis
Blow Force
Gear 10
Blow Force
22oc 56oc
C.H. ON
5 oc
H.C.W. Hysteresis
C.H. Hysteresis
H.C.W. Hysteresis

TECH
II.m) Working Modes
With this function you can select one out of four working modes. The asterisk
(*) next to a given mode means that the boiler is working in this mode. You
can select only one mode out of five.
II.m.1) House Heating
If you select this option the regulator will switch into the house heating
mode. The central heating pump starts to run above the pump activation
threshold (set to 40°C by default). Below this temperature the pump is shut
off.
II.m. ) Water Heater Priority
Activating the hot consumption water pump (by selecting ON) will cause the
regulator to switch into the water heater priority mode. In this mode the (hot
consumption water) boiler pump is activated until the set temperature is
reached. Then the pump is shut off and the central heating circulation pump
is activated.
If you press EXIT (hold for several seconds) the display will show the water
heater setpoint temperature. In order to activate the hot consumption water
pump it is necessary to raise the setpoint temperature above the pump
- 11 -
22oc 56oc
C.H. ON
Blow Force
Working Modes
Blow Force
Working Modes
House Heating *
Water Heater Priority
House Heating
Water Heater

ST-37 – Instruction Manual
activation threshold (see page 9, point II i).
The temperature is adjusted with PLUS and MINUS. After several seconds
the display will return to its previous state. After reaching the water heater
setpoint temperature the hot consumption water pump is shut off causing
the central heating pump to be activated.
In this mode the fan and the feeder are limited to 62°C to prevent the boiler
from overheating. Such condition will be kept until the water heater setpoint
temperature is reached. When the temperature is reached the hot
consumption water pump is shut off and the central heating pump is
activated.
The central heating pump will run until the water heater temperature drops
below the setpoint value; then the central heating pump is shut off and the
hot consumption water pump is activated.
The hot consumption water priority function consists in that the consumption
water is heated up before heating up water in radiators.
ATTENTION: The boiler should have non-return valves mounted on central
heating and hot consumption water circuits. The valve mounted on the pump
will prevent the hot consumption water from being discharged from the water
heater. The valve mounted on the central heating circuit will not let the hot
consumption water move from the water heater into the house circuit.
II.m.3) Parallel Pumps
In this mode the pumps run initially in parallel above the set temperature
(see the pump switch-on temperature function). The central heating pump
- 12 -
Water Heater Priority
Parallel Pumps *

TECH
continues to run and the hot consumption water pump is shut off after the
water heater setpoint temperature has been reached.
ATTENTION: in this mode you should mount a three-way valve or a mixing
valve that will maintain different temperatures in the water heater and in the
house.
II.m.4) Summer Mode
When the function is enabled the central heating pump is activated and the
hot consumption water pump is activated above the set temperature (see the
pump switch-on temperature function); the hot consumption water pump runs
throughout this period. In the summer function only the setpoint
temperature is set on the boiler that heats up water for the water heater.
After the summer function is enabled the display will show the letter l.
II.n) Room Regulator
The ST-37 regulator can be connected to a room regulator. In such case it
has a higher priority which does not apply to heating from the water heater.
The feeder and the fan run until the temperature set with the room regulator
is reached and the central heating pump runs throughout this period (the
central heating pump can be shut off using service settings; after the
- 13 -
Parallel Pumps
Summer Mode *
22oc 56oc
C.H. ON
Working mode
Room Reg
On
O *

ST-37 – Instruction Manual
room setpoint temperature has been reached the central heating pump is
shut off and will be activated again when the room temperature drops below
the setpoint value). However the boiler is limited in its operation by the
temperature set with the boiler controller. When the room regulator function
is enabled the display shows the lower-case letter p.
CONNECTING THE OOM EGULATO : the room regulator has a two-wire
cable that should be connected to the controller's connection strip via a
connector marked as room regulator.
ATTENTION: no external voltage can be applied to the room regulator
output.
II.o) Week Based Regulation
With this function you can program daily temperature changes in the boiler.
Step one:
First set the correct time and date.
Step two:
Set the days (parameters used in the first mode):
- 14 -
22oc 56oc
C.H. ON
Room Reg
Week-based Reg
Time
Date

TECH
Monday - Sunday
Start is the time when the temperature starts to rise or drop.
Stop is the time when the temperature ceases to rise or drop.
Temperature difference is the rise or the drop in degrees e.g.
Monday
start at 6 00
stop at 14 00
temperature change – 10°C
In this case when the boiler setpoint temperature is 50°C it will drop by
10°C from 600 to 1400 on Monday i.e. the boiler setpoint temperature will be
40°C.
Next set intervals (required for the second mode) from Monday to Friday
and from Saturday to Sunday.
Monday – Friday ; Saturday – Sunday
Start is the time when the temperature starts to rise or drop.
Stop is the time when the temperature ceases to rise or drop.
Temperature difference is the rise or the drop in degrees e.g.
Monday
start at 6 00
stop at 14 00
temperature change – 10°C
In this case when the boiler setpoint temperature is 50°C it will drop by
10°C from 600 to 1400 on Monday i.e. the boiler setpoint temperature will be
40°C.
Step three:
Activate one of the two modes:
in the first mode the temperature change is defined individually for each
- 15 -

ST-37 – Instruction Manual
day
in the second mode the change is defined for working days (Monday -
Friday) and weekend days (Saturday - Sunday)
When the function is enabled the main page displays "t1" or "t2" (the digits
indicate the active mode) to indicate that the week-based regulation is active.
II.p) Temperature Alarm
The alarm activation time is adjusted with PLUS / MINUS. The set time is
stored after pressing OPTIONS. The function is enabled only in the
operation mode (i.e. when the furnace temperature is lower than the
setpoint temperature). When the furnace temperature fails to rise in the user-
defined period an alarm is activated: the feeder and the fan are shut off (the
water pump is switched on and off independently) and the alarm is sounded.
The display shows an appropriate message (see Protections).
II.q) Stand by in Sustain Mode
The function accessible from this menu is used for regulating the furnace
while in the sustain mode. This is to prevent damping of the furnace when
- 16 -
22oc 56oc
C.H. ON
Temp Alarm
Stand-by in Sustain
2 min
Stand-by in Sustain
22oc 56oc
C.H. ON
Room Reg
Temp Alarm
3 h
Temp Alarm

TECH
the boiler temperature is over the setpoint temperature. With this function
you can set the feeder stand-by time (working time is set as constant by
default). Set the burnout pause time according to the type of fuel and boiler
used.
ATTENTION: Incorrect settings may cause a continuous increase of the
temperature! The burnout pause time should not be too short.
II.r) Factory Settings
The regulator has been pre-configured. However it should be adjusted to
your individual needs. It is possible to return to the factory settings at any
time. By enabling factory settings all boiler settings that you have made
will be replaced by settings made by the manufacturer. From then on you can
again set your own operating parameters for the boiler.
III. Protections
In order to ensure a safe and faultless operation the regulator has been
provided with numerous protections. In the case of an alarm an acoustic
warning is sounded and the display shows an appropriate message.
Press OPTIONS to restore the controller to normal operation.
- 17 -
22oc 56oc
C.H. ON
Stand-by in Sustain
Factory Settings
No
Yes

ST-37 – Instruction Manual
III.a) Temperature Alarm
The protection is enabled only in the operation mode (i.e. when the furnace
temperature is lower than the setpoint temperature). When the furnace
temperature fails to rise in the user-defined period an alarm is activated: the
feeder and the fan are shut off (the water pump is activated regardless of the
furnace temperature) and the alarm is sounded. The display shows an
appropriate message:
If you press OPTIONS the regulator will deactivate the alarm. The regulator
will return to the previous working mode.
III.b) Thermal Protection
The boiler is protected with an additional bimetal sensor (located at the
furnace sensor) that deactivates fan and feeder inputs when the temperature
exceeds the critical value of 85°C. This is to prevent water from boiling in the
system when the boiler has been overheated or the regulator damaged. With
this type of safety temperature protection the system will return to the initial
position (automatically).
III.c) Automatic Sensor Check
When the temperature sensor of the central heating hot consumption water
screw or grate is damaged an alarm is activated with an additional indication
shown in the display e.g.:
- 18 -
A L A R M
Temp does not rise
A L A R M
Sensor damaged

TECH
the feeder and the fan are shut off. The pump is activated regardless of the
actual temperature. If you press OPTIONS the regulator will deactivate the
alarm and the controller will return to normal operation.
III.d) Anti Boil Protection
This function is used for protecting the boiler against high temperatures [only
with the water heater priority function] e.g. when the water heater
setpoint temperature is 55°C and the boiler temperature is 62°C the
controller will shut off the feeder and the fan. When the temperature reaches
80°C the central heating pump will be activated. When the temperature
continues to rise the alarm will be sounded at 85°C. Such condition may
appear when the water heater or the pump is damaged or when the sensor
has been improperly mounted. However when the temperature continues to
drop the controller will activate the feeder and the fan at 60°C and it will
continue to operate until the water heater setpoint temperature is reached.
III.e) Temperature Protection
The regulator has an additional protection in case the bimetal sensor is
damaged: after the temperature exceeds 85°C the alarm is sounded. The
display will show:
The actual temperature that is read from an electronic sensor and processed
by the thermoregulator. When the alarm temperature is exceeded the fan is
shut off and both pumps begin to run in order to distribute hot consumption
water throughout the system.
- 19 -
A L A R M
Temp too high

ST-37 – Instruction Manual
III.f) Fuel Container Protection
At the fuel container screw or the fuel container slate (in slate boilers) an
additional temperature sensor is mounted. If the temperature rise is high
(above 65°C) the alarm is sounded: the feeder is activated for 10 minutes
with the fuel being moved into the combustion chamber. The screw sensor
protects the fuel from being combusted in the grate.
ATTENTION: in the case of a prolonged voltage loss it is recommended to
empty the boiler furnace in order to prevent the screw sensor or the grate
sensor from being damaged.
III.g) Fuse
The regulator has a network protection WT 6.3A tube fuse.
ATTENTION: it is not advisable to use fuses with higher current ratings.
Higher current ratings may cause damage to the controller.
IV. Maintenance
Before and during the heating season the ST-37 controller should be checked
for condition of its cables. You should also check if the controller is properly
mounted and clean it if dusty or dirty. It is advisable to measure grounding
parameters for the motors (central heating pump hot consumption water
pump fan and feeder).
- 20 -
A LA R M
Feeder Sensor