STIEBEL ELTRON SOM6SI User Manual

SOM 6 SI

Installation,
Configuration
and Troubleshooting
Manual

Thanks for buying this product.
Read this manual carefully to get the best perfomance from this unit.

SOM 6 SI

manual

SOM 6 SI

US

Contents

Imprint .................................................................................2

Security devices ...................................................................2

Technichal data and function survey .................................3

1. Installation .............................................................4

1.1 Mounting .................................................................................. 4

1.2 Electrical wiring ...................................................................... 4

1.2.1 Standard solar system ........................................................... 5

2. Operation and function ........................................6

2.1 Adjustment buttons .............................................................. 6

2.2 System monitoring display ................................................... 6

2.2.1 Channel indication ................................................................. 6

2.2.2 Tool bar .................................................................................... 6

2.2.3 System screen ......................................................................... 7

2.3 Blinkcodes ............................................................................... 7

2.3.1 System-Screen Blinkcodes ................................................... 7

2.3.2 Blinking codes ......................................................................... 7

3. Control parameter and indication channels ......8

3.1 Channel overview .................................................................. 8

3.1.1-6 Indication channels ................................................................ 9

3.1.7-19 Adjustment channels ...........................................................10

3.2 Recommended Settings .....................................13

4. Troubleshooting Tips ...........................................14

5. Warranty ..............................................................17

Safety regulations:

Please read the following information carefully before
installing and operating the controller. When configuring
the controller please utilize some semblance of the
recommeded settings illustrated in section 3.2. This will
avoid damage to the solar system by common problems
such as overheating. Installing the controller using the

default settings without making any adjustments to
the configuration parameters is likely to result in an
overheating condition of the solar system at some
point. Please ensure that the mounting is in accordance to

local, state and federal regulations.

CU 72060171 01
UL 60730-1A:2002
CSA E60730.1:2002

C

Reprinting / copying

This installation manual in its entirety is copyrighted.
Another use outside the copyright requires the approval
of STIEBEL-ELTRON Inc. This especially applies for copies,
translations, micro films and the storage into electronic
systems.
Editor: STIEBEL-ELTRON Inc.

Important notice:

Your own calculations and plans under consideration of
the current norms and DIN-directions should only be
basis for your projects. We don´t offer a guarantee for the
completeness of the drawings and texts of this manual ­they only represent some examples. They can only be used
at your own risk. No liability is assumed for incorrect,
incomplete or false information and the resulting damages.

.

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SOM 6 SI

!







• system-monitoring-display

• upto4temperaturesensors

Pt1000

• functioncontrol

• user-friendlyoperation

• solarloopoperatinghours

counter

Scope of delivery:

1 x SOM 6 SI

1 x accessory bag

1 x spare fuse T4A
2 x screws and dowels
4 x strain relief and screws

Additionally enclosed in the full kit:

2 x sensor FKP6
1 x heat conductive paste

Technical data

Housing:

plastic, PC-ABS and PMMA

Protection type: IP 20 / DIN 40050

Environmental temp.: 32 - 104 °F
Size: 172 x 110 x 46 mm

Mounting: wall mounting, mounting

into patch-panels is possible

Display: System screen with graphi­cal illustration, 16-segment display,
7-segment display, 8 symbols for system
status and operating control lamp

Operation: by 3 pushbuttons in the
front of the housing

Functions: Temperature differential
controller with optional add-on system
funtcions. Function control according
to BAW-guidelines, operating hours
counter for solar pump and tube coll­ector special function.

Inputs: for 3 temperature sensors
Pt1000

Outputs: 1 electromechanical relay

Power supply:

120 VAC

Total power supply:

2 (1) A 120 VAC

Mode of operation:

Typ 1.b

Breaking capacity per relay:

electromechanical relay:
2 (1) A 120 VAC

SOM 6 SI

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12

S1 S2 S3

3456

Temp. Sensor Pt1000

LNR1N

20191817141312

2 (1) A 115V~

T4A

US-West Hatfield,MA 01088

SOM 6 SI

Inc.

1. Installation

1.1 Mounting

cover

cable conduits with strain
relief

Lower fastening hole

display

can fuse 4A

Upper fastening hole

pushbutton

Warning!
Switch-off power supply before
opening the housing.

The unit is designed for indoor installation only. It is not
suitable for installation in hazardous locations and should not
be sited near to any electromagnetic field. The controller
must installed in accordance with all electrical regulations.
These regulations vary from region to region. Please contact
the appropriate agency in your area if unclear on this.

Wall Mounting Instructions

1. Unscrew the cross-recessed screw of the cover and
remove it from the housing.

2. Mark the upper fastening point on the wall and mount
the enclosed dowel and screw.

3. Hang up the housing at the upper fastening point and
mark the lower fastening point on the wall. The distance
between the 2 mounting holes is 130 mm.

4. Fasten the housing at its lower point..

1.2 Electrical wiring

S4

7

8

Sensor clamps

Earth ground

fuse

Relay output

Line voltage input

The power supply to the controller must only be made by
an external power supply switch and the line voltage must
be 120 VAC (50/60 Hz). Flexible lines are to be fixed at the
housing by enclosed strain relief supports and screws.

The SOM 6 controller is equipped with 1 relay which is
usually connected to the solar loop’s circulator pump.

• Relay 1

18 = Conductor R1
17 = Neutral conductor N
13 = Earth ground

The temperature sensors (S1 to S4) are to be connected
to the following terminals (not polarity sensitive):

1 / 2 = Sensor 1 (Collector sensor)
3 / 4 = Sensor 2 (Storage sensor)

5 / 6 = Sensor 3 (For monitoring only)
7 / 8 = Sensor 4 (For monitoring or Energy Production

Measurement)

The power supply is to be connected to the following

terminals:

19 = neutral conductor N

20 = line conductor L
12 = ground terminal

Electrostatic discharge can lead to damage to
electronic components!

Hazardous voltage present!

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SOM 6 SI

1.2.1 Allocation of clamps for system 1 Standard solar system with 1 store, 1 pump and 3 sen­sors. The sensor S4 / TRF can optionally be used for energy
production measurement.

S1

R1

S4 / TRF

S3

S2

Symbol Specification

S1 Collector sensor
S2 Lower tank sensor
S3 Upper tank sensor

(optional)

S4 / TRF Sensor for energy

production measurement

(optional)

R1 Solar pump

SOM 6 SI

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2. Operation and function

2.1 Pushbuttons for adjustment

backwards

2

1

3

(selection / adjustment mode)

SET

2.2 System monitoring display

forward

The controller is operated by the 3 keys below the display.

To enter the configuration mode toggle through the display
parameters by pressing and releasing key 1 until this no
longer causes the display to change. At this point press and
hold key 1 until the configuration parameters are displayed
(about 5 seconds), then quickly release the key to avoid tog­gling to the end of the parameter list. The first parameter in
the list is DT O. To change the setting of a given parameter,
follow the steps below.

1. Toggle to the parameter using keys 1 and/or 2. The
abbreviation for the parameter is displayed on the right
side of the screen, with the setting directly below, and the
set icon solid (not blinking) on the extreme right.

2. Press key 3. The set icon begins blinking signifying that
the parameter may now be adjusted.

3. Quickly use keys 1 and/or 2 to change the setting to
that which is required.

4. Press key 3 again. The set icon stops blinking signifying
that the new value has been stored.

The system display consists of an indication channel, a tool
bar, and the system screen. These are detailed below.

Monitoring-Display

2.2.1 Indication Channel

Indication channel

2.2.2 Tool bar

Toolbar only illustrated above

The indication channel consists of two lines. The upper
line is an alphanumeric 16-segment display, in which an
abbreviation of the current setting or reading is shown. In
the lower 7-segment display, the value of said reading or
setting is shown.

The additional symbols of the tool bar indicate the current
system status.

Symbol standard flashing

relay 1 active

maximum storage
temperature reached
or exceeded

antifreeze- function activated

+

+

collector cooling function or
reccoling function active

collector minimum limitation
or antifreeze function active

collector security shutdown or
store securtiy shutdown active

sensor defect

manual operation active

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SOM 6 SI

2.2.3 System screen

only system screen

The system screen (active system scheme) shows the
schemes selected on the controller. It consists of several
system component symbols, which are - depending on the
current status of the system - either flashing, permanently
shown or hidden.

Collector 1

Pumps

Sensor 1

S t or a g e t a n k h e a t
exchanger

Collector
with collector sensor

Sensor

Storage tank

Temperature sensor

Pump

Store 1

with heat exchanger

2.3 Blinking codes

2.3.1 System screen blinking codes

2.3.2 LED blinking codes

• Pumps are blinking during starting phase

• Sensors are blinking when their value is being displayed in

the indication channel.

• Sensors are quickly blinking in case of sensor defect.

Constantly green: Normal operation
Red/green blinking: Power-up phase
Manual operation
Red blinking: Sensor defect

(sensor symbol is quickly blinking)

SOM 6 SI

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3. Controller parameter and indication channels

3.1 Channel-overview

Legend:

x*

Corresponding channel is available if the appropriate option
is activated.

Please note:
S3 and S4 are only indicated if sensors are connected.

channel specification page

COL x Collector Temperature 9

TST x Lower Storage Tank Temperature 9

S3 x Sensor 3 Temperature 9

TRF

S4

h P x Operating Hours Counter 9

kWh

MWh

DT O x Switch-On Temperature Differential 10

DT F x Switch-Off Temperature Differential 10

S MX x Maximum Storage Tank Temperature 11

EM x Collector Emergency Shutdown

Return Sensor Temperature 9



Sensor 4 Temperature 9



Energy Production kWh 10



Energy Production MWh 10



Temperature

11



Corresponding channel is only available if the option energy
production measurement is activated (OHQM).



Corresponding channel is only available if the option energy
production measurement is deactivated (OHQM).

MEDT

The channel antifreeze content (MED%) is only shown if a
medium other than water or propylene glycol is used.
The adjustment is only appropriate when using other types
of antifreeze.

channel specification page

OCN x Collector Minimum Temperature

CMN x* Collector Minimum Temperature 11

OCF x Antifreeze Function 11

CFR x* Antifreeze Temperature 11

OREC x Recooling Option 12

O TC x Tube Collector Function 12

OHQM x Energy Production Measurement 10

FMAX

FMXG

MEDT

MED% MEDT Antifreeze Concentration 10

HAND x Circulator Pump Operating Mode 12

LANG x Language 12

UNIT x Temperature Units °FAH / °CEL 12

PROG XX.XX Program Number

VERS X.XX Version Number

Limitation

Maximum Flow Rate (LPM) 10



Maximum Flow Rate (GPM) This is only



available on later release levels

Antifreeze Type 10



11

10

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SOM 6 SI

3.1.1 Collector Temperature

COL:

Collector Temperature
display range: -40 →+482 °F

3.1.2 Lower Storage Tank Temperature

TST:

Store Temperature
Display range: -40 →+482 °F

3.1.3 Sensor 3 or 4

S3, S4:

Sensor Temperatures
Display range: -40 →+482 °F

3.1.4 Other Temperatures (if applicable)

Shows the current collector temperature.

• COL : collector temperature

Shows the current store temperature.

• TST : store temperature

Shows the current temperature of the corresponding ad­ditional sensor (without control function).

• S3 : sensor 3 temperature

• S4 : sensor 4 temperature

Please note:
S3 and S4 are only indicated if the temperature sensors
are connected (shown).

TRF:

Return Flow
Tempe rature
Display range: -40 →+482 °F

3.1.5 Operating Hours Counter

h P:

Number of hours which
relay 1 has been active

Shows the current temperature of the sensor.

• TRF : return flow temperature

The operating hours counter adds up the solar operating
hours of the relay (h P). The total amount of hours which
the relay has been active is shown on the display.

The operating hours total can be reset. As soon as the oper­ating hours channel is selected, the symbol is displayed

solid. To reset the operating hours press and hold the middle
key (key 3) for approximately 5 seconds. The set symbol
blinks. Press key 3 again and the operating hours counter
is reset to 0.

In order to interrupt the RESET-procedure, don’t press any
button for about 5 seconds. The controller returns automa­tically into the display mode.

SOM 6 SI

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3.1.6 Energy Production Measurement

OHQM: Energy Production

Measurement. Adjustment
range: OFF/ON
Factory setting: OFF
FMAX:
Volumetric flow rate in l/min
Adjustment range 0 - 20
in steps of 0.1
Factory setting 6.0

MEDT: Antifreeze Type
Adjustment range 0 - 3
Factory setting 1

MED%: Antifreeze
Concentration in (Vol-) %
MED% is blinded out by
MEDT 0 and 3.
Adjustment range 20 - 70
Factory setting 45

kWh/MWh:Energy produc­tion in kWh / MWh
Display channel

A measurement of the system’s energy production is pos­sible in conjunction with a flowmeter and an additional
sensor which measures the heat exchanger’s return tem­perature. Activate this option by changing the value of
OHQM to “on”.

Adjust this setting to the maximum flow rate of the system
in liters per minute. This is necessary in order to calculate
the system‘s actual energy output. Some controllers have
an additional parameter, FMXG, which is the flow rate in
gallons per minute.

Type of antifreeze:

0 : water
1 : propylene glycol
2 : ethylene glycol
3 : Tyfocor® LS / G-LS

The energy produced by the system is measured by the
calculation of the volume of heat exchanger fluid moved
through the system and a comparison of the temperature
of the fluid leaving the collector (S1) with that of the fluid
exiting the storage tank‘s heat exchanger (S4). It is shown
in kWh in one channel and MWh in another.

The total energy produced can be reset. As soon as one of
the display channels of the heat quantity is selected, the sym-

bol is displayed solid. To reset the total energy produced
press and hold the middle key (key 3) for approximately 5
seconds. The set symbol blinks. Press key 3 again and the
total energy produced is reset to 0..

In order to interrupt the RESET-procedure, no button
should be pressed for about 5 seconds. The controller re­turns automatically into indication mode.

3.1.7 ∆T-regulation

DT O:

Switch-On Temperature
Differential
Adjustment range

2.0 - 40.0 °F
Factory setting 12.0

DT F:
Switch-Off Temperature
Differential
Adjustment range

1.0 - 38.0 °F
Factory setting 8.0 °F

Please note: Switch-on temperature difference DT O must
be at least 2 °F higher than the switch-off tempe rature­difference DT F.

Primarily, the controller works in the same way as a standard
differential controller. If the switch-on difference (DT O)
is reached, the pump is activated. If the adjusted switch-off
temperature is measured (DT F), the controller switches
off.

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SOM 6 SI

3.1.8 Maximum Store Temperature

S MX:

Maximum Storage Tank
Temperature
Adjustment range:
40 - 205 °F
Factory setting 140 °F

3.1.9 Collector Emergency Shutdown
Temperature

EM: Collector Emergency

Shutdown Temperature
Adjustment range
230 - 400 °F,
Factory setting 285 °F

3.1.10 System Cooling Functions.

OCX:

System Cooling
Adjustment range OFF/ON
Factory setting OFF

CMX:
Maximum Collector
Temperature
Adjustment range:
210 - 380 °F
Factory setting 250 °F

If the adjusted maximum temperature is exceeded, a further
loading of the store is stopped so that a damaging overheating
can be avoided. If the maximum store temperature is
exceeded, the symbol is displayed.

Please note: The controller is equipped with a security­switch-off of the storage tank, which will not allow further
loading of the tank if it reaches 205 °F.

If the collector emergency shutdown temperature (EM)
is reached, the solar pump (R1) is deactivated in order to
avoid damaging the solar components. The default setting is
285 °F. If the system is in emergency shutdown mode the
symbol is flashing. The system will not exit this mode
until the temperature measured is 30 °F lower than the
value of this setting.

The system cooling function is used to prevent the system‘s
heat exchanger fluid from overheating. This in turn prevents
the degradation of the fluid‘s corrosion inhibitors avoiding
damage to the system components. If the system cooling
function is activated the symbol is flashing.

If the maximum collector temperature is reached the maxi­mum storage tank temperature is overridden and the sys­tem‘s circulator pump is turned on, cooling the system‘s HX
fluid using the water in the storage tank. This will continue
until either the collector temperature is measured to be at
least 9 °F lower than the setting of “CMX”, the tank reaches
it’s 205 °F security-switch-off temperature, or the collector
reaches its collector emergency shutdown temperature. The
last two instances should not occur if the system is sized
and configured properly.

3.1.11 Minimum Collector Temperature Limit

OCN: Collector Minimum

Temperature Limitation
Adjustment range OFF/ON
Factory setting OFF

CMN: Collector Minimum
Temperature
Adjustment range 50 - 195°F
Factory setting 50°F

3.1.13 Antifreeze Function

OCF:

Antifreeze Function
Adjustment range OFF/ON
Factory setting OFF

CFR:
Antifreeze Temperature
Adjustment range 15 - 50°F
Factory setting 40°F

The minimum collector temperature is a temperature which
must be exceeded in order for the solar pump (R1) to be
switched-on. The minimum temperature setting is used to
avoid starting-up the solar pump (or solid fuel boiler charging
pumps) when the temperature of the heat exchanger fluid
is too low. If the minimum temperature feature is activated

the symbol is shown on the display (blinking).

The antifreeze function activates the loading circuit between
collector and tank if the antifreeze temperature is reached
in order to protect the heat exchanger fluid against freezing
or “thickening“. If the antifreeze temperature is exceeded
by 2°F, the loading circuit will be deactivated.

Please note:
As there is only a limited heat quantity of the tank available
for this function, the antifreeze function should only be used
in regions with few days of temperatures around freezing
point.

SOM 6 SI

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3.1.13 Recooling Function

OREC:

Recooling Option
adjustment range
OFF / ON
Factory setting: OFF

This setting is designed to be used in conjunction with the
System Cooling Function, which overrides the maximum
store temperature (S MX) when used. This function will
cool the tank back down to its maximum temperature when
the collector temperature becomes low enough to facilitate
such. This prevents a cumulative overheating condition if the
cooling function needs to be used multiple days in a row.
In order to utilize this function with tube collectors, a heat
rejection loop (heat dump) is necessary.

3.1.14 Tube Collector Function

O TC:

Tube Collector Function
Adjustment range:
OFF / ON
Factory setting: OFF

3.1.15 Circulator Pump Operating Mode

HAND:

Operating Mode
Adjustment range:
OFF/AUTO/ON
Factory setting: AUTO

If the controller measures an increase of 4 °F compared to
the collector temperature which was last stored, the solar
pump is switched-on for about 30 seconds. After the solar
pump is deactivated the current collector temperature is
stored as new reference value. If the measured temperature
(new reference value) is again exceeded by 4 °F, the solar
pump again switches-on for 30 seconds. If the switch-on
differential is reached during any of these processes the
controller automatically switches over to solar charging.

If the collector temperature drops by 4 °F while the system
fluid is stagnant, the switch-on value for the special tube
collector function will be recalculated.

For control and service work the operating mode of the
controller can be manually adjusted by selecting the ad­justment value HAND, in which the following settings are
available.

• HAND

Operating mode
OFF : relay off (flashing) +
AUTO : relay in automatic operation
ON : relay on (flashing) +

3.1.16 Language

LANGUAGE

Language Setting
Adjustment range:
dE, En, It, Fr
Factory setting: En

3.1.17 Units for Temperature Display

UNIT:

Temperature Display Units
Adjustment range:
FAH, CEL
Factory setting: FAH

The menu language can be adjusted in this channel.

• dE : German

• En : English

• It : Italian

• Fr : French

The menu units can be adjusted in this channel:

• °FAH

• °CEL

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SOM 6 SI

3.2.1 Recommended Settings for Standard DHW System

Display

Code

DT O

DT F

S MX

EM

OCX

CMX

OCN

Parameter Name

and Reference

Switch on Temperature

Difference (p. 10)

Switch off Temperature

Difference (p. 10)

Maximum Store

Temperature (p. 11)

Collector Emergency

Shutdown Temperature

(p. 11)

System Cooling
Function (p. 11)

Maximum Collector

Temperature (p. 11)

Minimum Collector
Temperature (p. 11)

Recommended Setting and Explanation

(All temperatures in °F)

15° Setting this too low can cause the circulator to cycle on and

off too frequently.

5° Too high of a ΔT between DT O and DT F can cause the
circulator to switch on and off too frequently.

140° This will prevent the temperature at the top of the tank
from getting hot enough to cause the T & P valve to release.
This will also allow the cooling function to operate effectively.

310° This prevents the HX fluid directly behind that in the
sensor well from causing the system to go into emergency
shutdown mode as soon as the cooling function is activated.

On Failure to change this option to ‘on’ will likely result in
overheating of the system at some point.

230° Having a relatively large ΔT between CMX and EM
prevents the HX fluid directly behind that in the sensor well
from causing the system to go into emergency shutdown mode
as soon as the cooling function is activated.

Off The ΔT between DT O and DT F achieves the requisite
effect for most situations.

OCF

OREC

O TC

OHQM

HAND

LANG

UNIT

Please note that advanced users may desire to adjust certain parameters differently depending

on the circumstances. These suggested settings are merely a manner in which to congure the

unit that will avoid damage to the system from overheating. Installing the SOM 6 with the default
settings will likely result in an overheating condition of the solar system.

Antifreeze Option

(p. 11)

Recooling Function

(p. 12)

Tube Collector

Function (p. 12)

Energy Production

Measurement (p. 10)

Circulator Pump

Operating Mode (p. 12)

Language (p. 12)

Units for Temperature

Display (p. 12)

Off Unless the system is located in a region which rarely
experiences temperatures near freezing, and a very low glycol
to water percentage is being used.

On This prevents a cumulative overheating of the system by
ensuring a relatively high Δt between the tank temperature and
and the security switch-off of the tank (205°).

Off Unless the system is utilizing tube collectors.

Off Unless the installer has purchased an additional sensor and

wished to utilize this function.

Auto This is the normal operating mode. The other two
modes are for testing, charging, etc.

En (English) For most applications in North America this is
appropriate, with some exceptions.

FAH For most applications in North America this is
appropriate, but it is purely a matter of preference.

SOM 6 SI

© 06184 som_6_si.monen.indd

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12

S1 S2 S3

3456

Temp. Sensor Pt1000

LNR1N

20191817141312

2 (1) A 115V~

T4A

US-West Hatfield,MA 01088

SOM 6 SI

Inc.

4. Troubleshooting tips

If a malfunction occurs, a notification is given on the display
of the controller:

°F Ω °F Ω

14 961 131 1213
23 980 140 1232
32 1000 149 1252
41 1019 158 1271
50 1039 167 1290
59 1058 176 1309
68 1078 185 1328
77 1097 194 1347
86 1117 203 1366
95 1136 212 1385

104 1155 221 1404
113 1175 230 1423
122 1194 239 1442

Resistance values of the

Pt1000-sensors

S4

7

8

Warning symbol

Operating control lamp

can fuse T4A

Symptom Possible Cause and Remedies List

Operating control lamp flashes red. The
symbol is displayed and the symbol is flashing.
The indication channel of the relevent sensor
displays 888.8 instead of the temperature.

SOM unit is sensing an open circuit condition.

Measure the resistance between the two terminals to which 1.
the relevent sensor is attached. If it measures infinite resis­tance continue to step 2. If it measures a resistance within
range of the above chart, call for service.
Disconnect the sensor wire from the terminals and measure 2.
the resistance between the two wires. If it still measures infi­nite resistance continue to step 3. If it measures a resistance
within range of the above chart, there is a problem with the
connection from the sensor wire to the terminal.
This problem lies either with the sensor or the wire/connec-3.
tions. In order to determine whether the problem lies with
the sensor itself, the sensor must be disconnected from any
extension wire and its resistance must be measured. If, when
the sensor is disconnected, the resistance is measured to be
within the values of the resistance chart the problem is with
the extension wire/connections.

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SOM 6 SI

Symptom Possible Cause and Remedies List

Operating control lamp flashes red. The
symbol is displayed and the symbol is flashing.
The indication channel of the relevent sensor
displays -88.8 instead of the temperature.

Operating control lamp is off and screen is blank. SOM unit’s control board is not receiving power.

Collector is much hotter than the storage tank,
but the system’s circulator is not on.

SOM unit is sensing a short circuit condition.

Measure the resistance between the two terminals to which 1.
the relevant sensor is attached. If it measures a resistance
close to zero continue to step 2. If it measures a resistance
within range of the above chart, call for service.
Disconnect the sensor wire from the terminals and measure 2.
the resistance between the two wires. If it still measures a
resistance close to zero continue to step 3. If it measures a
resistance within range of the above chart, there is a problem
with the connection from the sensor wire to the terminal.
This problem lies either with the sensor or the wire/connec-3.
tions. In order to determine whether the problem lies with
the sensor itself, the sensor and its 4’ wire which was factory
installed must be disconnected from any extension wire and
its resistance must be measured. If, when the sensor is discon­nected, the resistance is measured to be within the values of
the resistance chart the problem is with the extension wire/
connections.

HAZARDOUS VOLTAGE PRESENT!

Measure the voltage between terminals 19 and 20. If the volt-1.
age is close to the nominal voltage of 120 VAC, continue to
step 2. If the voltage is not correct, the problem lies with the
power supply to the unit.
Remove the unit’s can fuse and measure its resistance. If the 2.
resistance is close to zero, call for service. If infinite resistance
is measured, replace the fuse.

Compare the tank’s present temperature with its maximum 1.
setting (S MX). If the storage tank is within 4 degrees of this
setting the circulator pump will not turn on even if the switch
on temperature has been reached unless the System Cooling
Function (OCX) is turned on and the Maximum Collector
Temperature (CMX) has been reached.

Check to see if the 2. symbol is blinking. If this is the case the
system is in Emergency Shutdown Mode. Either the collector
sensor measured a temperature equal to or greater than the
Collector Emergency Shutdown Temperature (step 3), or the
store sensor measured a temperature of at least 205 °F (step

4).
If the system has reached the Collector Emergency Shut-3.
down Temperature, the controller’s configuration needs to be
checked. Is the cooling function (OCX) set to on? Is there
a sufficiently large ΔT between the Maximum Collector
Temperature (CMX) and the Collector Emergency Shutdown
Temperature (EM)? To get the system to exit emergency
shutdown mode the EM setting must be at least 30 °F greater
than the measured collector temperature.
If the storage tank has reached its emergency shutdown tem-4.
perature (205 °F), the circulator will not turn on unless the
store sensor measures a temperature of 201 °F or less. This
parameter is not adjustable.

SOM 6 SI

Symptom Possible Cause and Remedies List

LED is blinking red and green. Check the Circulator Pump Operating Mode. This should 1.

Tank temperature cools excessively overnight. Make sure that the check valve between the upper port of 1.

Circulator pump is running, collector is much
hotter than store, but the tank fails to heat up.

HAZARDOUS VOLTAGE PRESENT!

be set to “auto”. If it is set to either “on” or “off” the unit

will flash red and green, the
symbol will be displayed.
If the unit is in its power up mode this condition is normal.2.

the lower heat exchanger and the output of the solar array is
installed and functioning properly.
Check all configuration settings (see section 3.2).2.
Make sure that all system components are properly insulated.3.

Make sure that the controller is actually powering the circula-1.
tor. Is the

configuration settings (see section 3.2). Otherwise continue to
step 2.

Check for 120 VAC between terminals 17 and 18. If the 2.
symbol is displayed and there is not 120 VAC between these
two terminals, call for service.
Check the system’s flow meter. Is the system getting the 3.
proper voumetric flow rate required by the collectors? If not,
try adjusting the system’s flow adjustment valve (if present).
If the system is getting no flow even though the circulator is 4.
running there is either an obstruction in the collector loop, or
there is air in the system. If the system recently experienced
an overheating condition, the problem is most likely the latter
and the system needs to be purged. There is also a possibility
that the circulator pump itself is defective.

symbol displayed in the tool bar? If not, check all

symbol will flash and the

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16 |

SOM 6 SI

6. Warranty

WARRANTY

RESIDENTIAL & COMMERCIAL WARRANTY: STIEBEL ELTRON WARRANTS TO THE ORIGINAL OWNER THAT THE
SOM 6 CONTROLLER WILL BE FREE FROM DEFECTS IN WORKMANSHIP AND MATERIALS FOR A PERIOD OF TWO
(2) YEARS FROM THE DATE OF PURCHASE. SHOULD THE PART(S) PROVE TO BE DEFECTIVE UNDER NORMAL USE
DURING THIS PERIOD, STIEBEL ELTRON, INC. WILL BE RESPONSIBLE FOR REPLACEMENT OF THE DETECTIVE PART(S)
ONLY. STIEBEL ELTRON, INC. IS NOT RESPONSIBLE FOR LABOR CHARGES TO REMOVE AND/OR REPLACE THE DE­FECTIVE PART(S), OR ANY INCIDENTIAL OR CONSEQUENTIAL EXPENSES.

SHOULD THE OWNER WISH TO RETURN THE SOM 6 CONTROLLER FOR REPAIR, THE OWNER MUST FIRST SECURE
WRITTEN AUTHORIZATION FROM STIEBEL ELTRON, INC. THE OWNER SHALL BE REQUIRED TO SHOW PROOF
OF PURCHASE DATE, AND TO PAY ALL TRANSPORTATION COSTS TO RETURN THE DEFECTIVE PART(S) OR SOM
6 CONTROLLER. WARRANTY IS VOID IF SOM 6 CONTROLLER HAS BEEN INSTALLED OR USED IMPROPERLY OR IF
DESIGN HAS BEEN ALTERED IN ANY WAY.

STIEBEL ELTRON, INC.

17 West Street

PHONE: [phone] or 413.247.3380
FAX: [phone]
E-Mail [e-mail]
www.stiebel-eltron-usa.com

Stiebel Eltron, Inc.

17 West Street
USA - West Hatfield, MA 01088

Phone: [phone]
Fax: [phone]

[e-mail]

Distributed by:

Please note:

The design and the specifications are to be changed without notice.
The illustrations may differ from original product.

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© 06184 som_6_si.monen.indd