Caleffi solar iSolar Wmz-G1 User manual

ISOLAR WMZ-G1
Mounting
Connection
Operation
Manual
*11200827* 11200827
Thank you for buying this product.
Please read this manual carefully to get the best performance from this unit.
Please keep this manual carefully.
en-US/CA

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Subject to technical change. Errors excepted.
Description of symbols
Disposal
Signal words describe the danger that may occur, when it
is not avoided.
Warning means that injury, possibly life-threatening injury,
can occur.
Attention means that damage to the appliance can occur.
•Dispose of the packaging in an environmentally sound
manner.
•Dispose of old appliances in an environmentally sound
manner. Upon request we will take back your old
appliances bought from us and guarantee an environ-
mentally sound disposal of the devices.
Information about the product
Proper usage
The iSolar WMZ-G1 is to be used for the measurement
and the display of system data by means of Grundfos Direct
Sensors™ in compliance with the technical data specified in
this manual.
Improper use excludes all liability claims.
Note
Notes are indicated with an information symbol.
Arrows indicate instruction steps that should be carried
out.
Table of contents
General.......................................................................2
Instructions ................................................................2
Description of symbols .............................................2
Disposal ......................................................................2
Information about the product................................2
Technical data and overview of functions ...............3
VBus board.................................................................4
1. Installation.....................................................5
1.1 Mounting........................................................5
1.2 Connections ..................................................5
1.3 Data communication / Bus ..........................5
2. Operation and function................................6
2.1 Push buttons for adjustment.......................6
2.2 Menu structure .............................................7
2.3 Initial commissioning ...................................7
2.4 Operating control lamp ...............................7
3. Measured values............................................7
4. Balance values...............................................7
5. Adjustment values........................................8
6. Reports ........................................................12
7. Examples of connection.............................15
Imprint .....................................................................16
WARNING! Warnings are indicated with a
warning triangle!
ÎThey contain information
on how to avoid the danger
described.
Safety advice
Please pay attention to the following safety advice in order
to avoid danger and damage to people and property.
Instructions
Attention must be paid to the valid local standards, regula-
tions and directives!
Equipment to be installed and used in accordance with the
rules of the National Electrical Code (NEC) or with Cana-
dian Electrical Code (CEC), Part I.
Target group
These instructions are exclusively addressed to authorised
skilled personnel.
•Only qualified electricians should carry out electrical
works.
•Initial installation must be effected by qualified personnel
named by the manufacturer.
General

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Included with the iSolar WMZ-G1:
1 x iSolar WMZ-G1
1 x VBus®slave board
1 x accessory bag
1 x spare fuse T4A
2 x screw and wall plug
4 x strain relief and screw
•Recording of:
flow temperature
return temperature
power
heat quantity
flow rate
pressure
differential pressure
system errors
•Especially for Grundfos Direct Sensors™
•Easy connection
•Dot matrix display
•Function control
•Configurable control parameters
Technical Data:
Housing:
plastic, PC ABS and PMMA
Protection class:
IP 20 / EN 60529
Ambient temperature:
0 ... 40 °C
Size: 172 x 110 x 47 mm/
6.8" x 4.3" x 2.5"
Installation: wall mounting,
mounting into patch panels is
possible
Operation: three push buttons
at the front of the housing
Inputs: 2 Grundfos sensors VFS,
RPS or DPS
Power supply:
24 V
The iSolar WMZ-G1 is a measurement
and display unit for solar thermal sys-
tems and conventional heating systems.
It is possible to connect up to two
Grundfos Direct Sensors™. Depending
on the number and type of sensors
connected, the unit is capable to show
temperature values, flow rates and
relative or differential pressures or a
combination of them.
Heat quantity measurement is possible
if two Grundfos Direct Sensors™ are
connected and at least one of them is
a VFS type sensor. The optional calo-
rimeter especially takes into account
that the density and the specific heat
capacity of the heat transfer medium
depend on the temperature as well as
on the mixing ratio of water /glycol.
Using these parameters and the mea-
surement of flow rate, flow and return
temperature, the unit calculates the
heat quantity.
A power failure protection guarantees
that the adjusted system parameters
and the calculated heat quantity are
maintained in the case of power loss.
Different sensors can be chosen and
configured using the push buttons.The
temperature of the selected measur-
ing point, the heat quantity gained, the
current power or the flow rate of the
system are indicated on the display.
A control lamp and a relay are inte-
grated to indicate sensor defects and
exceeded or underrun value ranges.
Technical data and overview of functions
2

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ÎUnscrew the cross-head screw of the cover (1.) and
remove the cover from the housing.
ÎUnscrew the two lateral srews of the transparent shield
(2.) and remove the shield.
ÎPull out the board which is to be replaced carefully (3.).
Replace with new board.
ÎPlace the shield back on the housing and attach with
the two screws.
ÎPut the cover on the housing and attach with the cross-
head screw.
VBus®board
When the iSolar WMZ-G1 is connected to a
controller, the VBus®master board has to be
replaced with theVBus®slave board!
When several iSolar WMZ-G1 modules are
cascaded and connected to a datalogger or PC
(see p. 14), only the VBus®master boards of the
iSolar WMZ-G1 modules with the subaddress
1 or higher have to be replaced with the VBus®
slave boards!
Replacing the VBus®board
WARNING! Electric shock!
Opening the housing will expose
live parts!
ÎSwitch off power supply and dis-
connect the device from mains
before opening the housing!
ATTENTION! ESD damage!
Electrostatic discharge can lead to da-
mage to electronic components!
ÎTake care to discharge properly
before touching the inside of the
device!
1.
2.
3.
The VBus®master board is marked with a “B”,
the VBus®slave board with a “J” in the upper
right corner of the populated side of the board.

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display
push button
can fuse T4A
cable conduits with strain
relief
cover
1.1 Mounting
The unit must only be located in dry interior locations. It is
not suitable for installation in hazardous locations and should
not be placed close to any electromagnetic fields.The device
must additionally be supplied from a double-pole switch with
contact gap of at least 3 mm/ 0.12". Please pay attention to
separate routing of sensor cables and power supply cables.
ÎUnscrew the crosshead screw in the cover and remove
it from the housing.
ÎMark the upper fastening point on the wall, drill the hole
and premount the enclosed wall plug and screw.
ÎHang the housing at the upper fastening point and mark
the lower fastening point on the underground (hole
distance 130 mm/ 5.1"), drill the holes and put in the
lower wall plug.
ÎFasten the housing.
ÎComplete wiring connections in accordance with ter-
minal allocations.
ÎPut the cover on the housing and attach with the cross-
head screw.
1. Installation
1.2 Connections
The power supply of the device must be carried out via an
external power supply switch only (last step of installation!)
and the line voltage must be 24 V. Flexible lines have to be
attached to the housing by means of the enclosed strain
relief and screws.
The device is equipped with 1 relay to which a load can
be connected:
Relay 1
R1 = conductor R1
N = neutral line N
12, 13, 14 = grounding
mains terminals
load terminals
sensor terminals
mounting
attachment
ground terminals
VBus terminals
T-1
S1
LNR1N
20191817141312
2 (1) A 24 V
T4A
Q-1
GND
+5V
T-2
Q-2
GND
+5V
S2
Netz / Mains
24 V
VBus
9 10
fuse ATTENTION! ESD damage!
Electrostatic discharge can lead to da-
mage to electronic components!
ÎTake care to discharge properly
before touching the inside of the
device!
WARNING! Electric shock!
Opening the housing will expose
live parts!
ÎSwitch off power supply and dis-
connect the device from mains
before opening the housing!
Note
The device must be grounded in order to func-
tion faultlessly.
ÎGround the device properly.

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1
3
2
backwards (-) forward (+)
OK
(selection / adjustment mode)
2. Operation and function
2.1 Push buttons for adjustment The device is operated via 3 push buttons below the dis-
play. The forward-button (1) is used for scrolling forward
through the menu or to increase the adjustment values.
The backwards-button (2) is correspondingly used for the
reverse function.
ÎSelect the desired sub-menu using buttons 1 and 2
ÎBriefly press button 3 in order to enter the sub-menu,
ÎThe selected sub-menu is now shown on the display. By
pressing the “back”-button, the display returns to the
former menu level.
ÎPress buttons 1, 2 and 3 several times until the desired
menu line is reached.
ÎBriefly press button 3 in the relevant menu line for modi-
fication of adjustment values – “change value” appears
on the display – adjust the requested value by pressing
buttons 1 and 2
ÎBriefly press button 3 in order to confirm the adjust-
ment.
ÎPlease reply to the following security inquiry “Save?” by
choosing “yes” or “no” (buttons 1 and 2) and confirm
with button 3.
Note:
If button 3 is kept pressed for 2 seconds, the
display goes back to the main menu
The sensors (S1, S2) are connected to the following terminals:
T-1
S1
LNR1N
20191817141312
2 (1) A (220 ... 240) V~
T4A
Q-1
GND
+5V
T-2
Q-2
GND
+5V
S2
Netz / Mains
220 ... 240 V~
VBus
9 10
T-1/ T-2 Q-1 / Q-2 GND +5V
yellow white green brown
temperature signal 1/ 2 flow rate signal 1/ 2 (or rela-
tive pressure signal or differ-
ential pressure signal depend-
ing on the sensor type)
ground supply
The RESOLVBus®connection is carried out at the termi-
nals marked “VBus” with either polarity.
Mains connection is at the mains terminals (see figure
to the left):
N = neutral line N
L = conductor L
12, 13, 14 = grounding
1.3 Data communication / Bus
The iSolar WMZ-G1 is equipped with the VBus®for data
transfer with and energy supply to external modules.The
connection is carried out at the two terminals marked
“VBus” (either polarity). One or more VBus®modules can
be connected via this data bus:
VBus
9 10
VBus®terminals

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2.4 Operating control lamp
The device is equipped with a red/green operating control
lamp.The following operating states can be visualized:
•green constant normal operation;
•green flashing measured value outside alarm limit
•red flashing defective sensor
•not illumated no voltage
2.2 Menu structure
In the first line of each submenu you will find the option
“back” (except in submenu “measured values”), by means of
which you can return to the former display level.
After a short time of operation, the display switches to the
submenu “measured values” which is then indicated during
normal operation.
MainMenu
1. Measuredvalues
2. Reports
3. Balancevalues
4. Adjust.values
The clear text display shows a 4-line extract of the se-
lected menu.
3. Measured values
S1:
T1: 74.8 ° c
P1: 0.14 bar
P: 9 W
S2:
T2: 23.9 ° C
Q2: 5.55 l/min
Heat: 19944 Wh
In the submenu “Measured values”, different measurement
values are shown: the measured values depend on the sen-
sor type and can be the following:
Sensor 1: T1 (temperature in ° C or ° F)
p1 (pressure in bar)
Q2 (flow rate in l/min, m³/h or gallon/h)
P (in W) – values over 999,999 W cannot be
processed. In such a case, both the displayed
value and the VBus®data packet value remain
at 999,999 W.
Sensor 2: T2 (temperature in °C or ° F)
p2 (pressure in bar)
Q2 (flow rate in l/min, m³/h or gallon/h)
Heat (in Wh, kWh, MWh, kJ, MJ or GJ.)
Note:
“Power” and “Heat” are only indicated when
at least one of the sensors connected is a VFS
type sensor and the option “Heatmeter” in the
submenu “Adj. values” has previously been set
to “Yes”.
S1 measures the flow temperature, S2 the return
temperature.
If the flow temperature is lower than the return temperature,
heat quantity measurement is not carried out. In that case,
the power is displayed as 0.
Briefly press button 3 in order to get back to the main menu.
2.3 Initial commissioning
•Language:
ÎSelect the menu item “Language” with button 1 and
confirm with button 3
ÎSelect the desired language with buttons 1 and 2
ÎIn order to confirm the selection, briefly press button 3
and answer the security inquiry with “Yes”
ÎIn order to change to the adjustment values menu,select
the menu item “back” and confirm with button 3
The following languages are available: German (“Deutsch”),
English, Spanish (“Castellano”), French (“Français”), Italian
(“Italiano“).The factory setting is “English“.
ÎEstablish the power supply
In the “Adjust. Values” menu, carry out the adjustments
mentioned below. For further information on the adjustment
values, see chap. 5.
•Date:
ÎSelect the menu item “Date” with button 1 and confirm
with button 3
ÎAdjust the year, the month and the day with buttons 1
and 2 and confirm each with button 3
ÎIn order to confirm the adjustment, briefly press button
3 and answer the security inquiry with “Yes”
• Time:
ÎSelect the menu item “Time” with button 1 and confirm
with button 3
ÎAdjust the hours and the minutes with buttons 1 and 2
and confirm each with button 3
ÎIn order to confirm the adjustment, briefly press button
3 and answer the security inquiry with “Yes”
Adj. values:
language english
Date 01.01.2009
Time 00:00

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Display of balance values “Heatmeter”:
• Heat:
Heat quantity in Wh, kWh, MWh, kJ, MJ or GJ.
Display of balance values “Others”:
• Operating days:
Number of operating days
balance values
heatmeter
heat 62254 Wh
balance values
others
operating days 0
5.Adjustment values In this menu the parameters and values for Sensor 1 and
Sensor 2, heat quantity measurement and bus mode can be
selected and adjusted. Furthermore, date and time have to
be set in this menu, see chap. 2.3.
Each sensor has two signals.The first signal of each sensor
refers to temperature. The second signal of each sensor
depends on the sensor type which can either be VFS for
flow rate, RPS for relative pressure or DPS for differential
pressure.
4. Balance values
Display of balance values “Sensor 1”:
• Temperature:
Min: minimum temperature at sensor 1 in ° C or ° F
Max: maximum temperature at sensor 1 in ° C or ° F
•Pressure:
Min: minimum pressure at sensor 1 in bar
Max: maximum pressure at sensor 1 in bar
•Diff-Pressure:
Min: minimum differential pressure at sensor 1 in bar
Max: maximum differential pressure at sensor 1 in bar
•Flow rate:
Min: minimum flow rate at sensor 1 in l/min, m³/h, gallon/h
Max: maximum flow rate at sensor 1 in l/min, m³/h, gallon/h
Acc: accumulated volume since commissioning / last re-
set in l, m³ or gallons
Display of balance values “Sensor 2”:
• Temperature:
Min: minimum temperature at sensor 2 in ° C or ° F
Max: maximum temperature at sensor 2 in ° C or ° F
•Pressure:
Min: minimum pressure at sensor 2 in bar
Max: maximum pressure at sensor 2 in bar
•Diff-Pressure:
Min: minimum differential pressure at sensor 2 in bar
Max: maximum differential pressure at sensor 2 in bar
•Flow rate:
Min: minimum flow rate at sensor 2 in l/min, m³/h, gallon/h
Max: maximum flow rate at sensor 2 in l/min, m³/h, gallon/h
Acc: accumulated volume since commissioning / last re-
set in l, m³ or gallons
In this submenu, the balance values for “Sensor 1”, “Sen-
sor 2” and “Others” are indicated.When “Heatmeter” has
previously been set to “Yes” in the submenu “Adj. values”,
the balance values for this item are also indicated.The bal-
ance values refer to the period of time the device has been
in use. If these values are reset to zero, a new operating
period starts.
Sensor 1
Temperature:
Min 23.8 ° C
Max 172.0 ° C
Sensor 2
Temperature:
Min 0.0 ° C
Max 23.9 ° C
Flow rate:
Min 5.55 l/min
Max 6.11 L/min
Acc 4322.7 l
Pressure:
Min 0.14 bar
Max 0.14 bar
Diff-Pressure:
Min 0.14 bar
Max 0.14 bar
Note:
The indicated balance values depend on the
selected sensor type!

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Signal 1
Select and adjust the parameters and values for the selected
sensor
•Auto-detect...
Start automatic sensor identification
If you select auto-detect, the sensor identifies itself: type
and sensor range are transmitted to the device. If no
automatic detection is possible, the type and range of
the sensor can be adjusted manually.
•Type:
Select the sensor type by choosing between:
Off: no sensor type is selected
VFS: Flow rate sensor: sensor for detecting flow rate
RPS: Relative Pressure Sensor: sensor for detecting
relative pressure
DPS: Differential Pressure Sensor: sensor for detecting
differential pressure
•Range:
Select the sensor range.
The range depends on the previously selected sensor
type (see tables to the left).
Sensor 1
Auto-detect...
Type RPS-...
Range 0-0.6 bar
VFS Range:
Custom: Min: 1-19.99 l/min, Max: 1.01-600.00 l/min
1-20 l/min
2-40 l/min
5-100 l/min
10-200 l/min
20-400 l/min
RPS Range:
Custom: Min: 0.00-39.99 bar, Max: 0.01-40.00 bar
0-0.6 bar
0-1 bar
0-1.6 bar
0-2.5 bar
0-4 bar
0-6 bar
0-10 bar
0-16 bar
0-25 bar
0-40 bar
DPS Range:
Custom: Min: 0.00-15.99 bar, Max: 0.00-16.00 bar
0-0.6 bar
0-1 bar
0-1.6 bar
0-2.5 bar
0-4 bar
0-6 bar
0-10 bar
0-16 bar
Adjust the parameters referring to temperature (signal 1):
•Unit:
Select the unit of temperature.A selection can be made
between ° C and ° F.
•Offset:
A sensor offset can be carried out.
Adjustment range: -99.9 ... 99.9 ° C or ° F
•Min Alarm:
If the minimum temperature is reached, the relay is en-
ergized, appears in the display, the LED flashes green
and an alarm message appears in the submenu “Reports”.
ÎSelect “Yes” or “No” to activate or deactivate the
function.
If this function is selected, the minimum value for the
alarm has to be adjusted.
Adjustment range: -888.8 ... 999.9 ° C or ° F.
•Max Alarm:
If the maximum temperature is reached, the relay is en-
ergized, appears in the display, the LED flashes green
and an alarm message appears in the submenu “Reports”.
ÎSelect “Yes” or “No” to activate or deactivate the
function.
If this function is selected, the maximum value for the
alarm has to be adjusted.
Adjustment range: -888.8 ... 999.9 ° C or ° F.
Adj. values:
Temperature
unit ° C
offset 0.0 ° C
min alarm yes
min 0.0 ° C
max alarm yes
max 100.0 ° C
Sensors 1 and 2

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Adjust the parameters referring to relative pressure (sig-
nal 2) if a RPS is used:
•Offset:
An offset can be carried out.
Adjustment range: 0 ... 99.99 bar
•Min Alarm:
If the minimum relative pressure is reached, the relay
is energized, appears in the display, the LED flashes
green and an alarm message appears in the submenu
“Reports”.
ÎSelect “Yes” or “No” to activate or deactivate the
function.
If this function is selected, the minimum value for the
alarm has to be adjusted.
Adjustment range: 0 ... 99.9 bar
•Max Alarm:
If the maximum relative pressure is reached, the relay
is energized, appears in the display, the LED flashes
green and an alarm message appears in the submenu
“Reports”.
ÎSelect “Yes” or “No” to activate or deactivate the
function.
If this function is selected, the maximum value for the
alarm has to be adjusted.
Adjustment range: 0 ... 99.99 bar
Adj. values:
Pressure
Offset 0.00 BAR
Min Alarm nO
min alarm yes
min 0.0 BAR
max alarm yes
max 12.0 BAR
Signal 2
Adjust the parameters and values for the second sensor
signal. The second signal of each sensor depends on the
sensor type.Therefore, the following parameters and adjust-
ment values depend on the sensor type (flow rate for VFS,
pressure for RPS, differential pressure for DPS)
Adjust the parameters referring to the flow rate (signal 2)
if a VFS is used:
•Unit: Select the unit of flow rate.
A selection can be made between l/min, m³/h and
gallon/h.
•Offset: An offset can be carried out.The adjustment
range depends on the previously selected unit.
•Min Alarm:
If the minimum flow rate is reached, the relay is ener-
gized, appears in the display, the LED flashes green
and an alarm message appears in the submenu“Reports”.
ÎSelect “Yes” or “No” to activate or deactivate the
function.
If this function is selected, the minimum value for the
alarm has to be adjusted.The adjustment range depends
on the previously selected unit.
•Max Alarm:
If the maximum flow rate is reached, the relay is ener-
gized, appears in the display, the LED flashes green
and an alarm message appears in the submenu“Reports”.
ÎSelect “Yes” or “No” to activate or deactivate the
function.
If this function is selected, the maximum value for the
alarm has to be adjusted.The adjustment range depends
on the previously selected unit.
Adj. values:
flow rate
unit l/min
offset 0.0 L/min
min alarm yes
min 0.0 l/min
max alarm yes
max 100.0 L/MIN

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Adjust the parameters referring to differential pressure
(signal 2) if a DPS is used:
•Min Alarm:
If the minimum differential pressure is reached, the
relay is energised, appears in the display, the LED
flashes green and an alarm message appears in the
submenu “Reports”.
ÎSelect “Yes” or “No” to activate or deactivate the
function.
If this function is selected, the minimum value for the
alarm has to be adjusted.
Adjustment range: 0 ... 99.9 bar
Adj. values:
diff.-Pressure
Min Alarm nO
Max Alarm nO
min alarm yes
min 0.0 BAR
max alarm yes
max 12.0 BAR
•Max Alarm:
If the maximum differential pressure is reached, the
relay is energized, appears in the display, the LED
flashes green and an alarm message appears in the
submenu “Reports”.
ÎSelect “Yes” or “No” to activate or deactivate the
function.
If this function is selected, the maximum value for the
alarm has to be adjusted.
Adjustment range: 0 ... 99.9 bar
Heat quantity measurement Heat quantity measurement is carried out by means of the
difference between the flow and the return temperature as
well as the measured flow rate. If the function is activated
(factory setting), make the following adjustments:
Adjustments for heat quantity measurement.
•Heatmeter:
Heat quantity measurement can be activated or deacti-
vated with this option.
•unit:
ÎSelect a unit for the indication of the heat quantity
The units Wh or kJ can be selected.
•Type:
ÎSelect the type of heat transfer fluid
Water, Propylene, Ethylene or Tyfocor ®LS can be se-
lected.
•antifreeze:
ÎAdjust the concentration of propylene or ethylene
glycol in the heat transfer fluid
This adjustment channel is only visible if “Propylene” or
“Ethylene” is selected as “Type”.
Adjustment range: 20 ... 70 %.
adj. values:
Heatmeter yes
unit Wh
Type wAtER
adj. values:
Unit Wh
Type Propylene
Antifreeze 38%
Note:
The parameters and adjustments have to be
selected and adjusted for sensor 2 as well. For
adjustment, please carry out the steps described
for sensor 1!

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In the submenu “Reports” different messages are indicated.
During normal operation, the messages to the left are
displayed.
6. Reports
Reports:
back
Everything OK
Version
Note:
Error messages depend on the error and on the
sensor type selected previously!
VBus®adjustments.
•Subaddress:
ÎAdjust a subaddress for a iSolar WMZ-G1
An individual module address can be adjusted for a
WMZ-G1.This way, it is possible to use severalWMZ-G1
with individual addresses in one system. If several
WMZ-G1 (up to 16 in total are possible) are connected
to one PC or datalogger, the WMZ-G1 have to be num-
bered serially, starting with 0.The connection sequence
at the VBus®-connection is arbitrary.
Adjustment range: 0 ... 15.
•Bus mode:
ÎAdjust the bus mode
Do not change the factory setting if the WMZ-G1 is
connected to a controller with VBus®output terminal
(corresponds to the bus mode “Passive”).
Select bus mode “Active”, if the WMZ is not connected
to a controller and if data are recorded on a PC or
datalogger.
Select bus mode “Cascaded”, if several WMZ are con-
nected to a PC or datalogger. The WMZ modules are
serially numbered starting with 0 (see above).
Adjustment range:Active, Passive, Cascaded.
Adj. values:
VBus
Subaddress 0
Bus mode active
Adj. values:
Subaddress 0
Bus mode cascaded
Bus master yes
If subaddress “0” and bus mode “Cascaded” are selected,
adjustments for the bus master have to be made:
•Bus master:
ÎAdjust the bus master
Select bus master“No” when severalWMZ-G1 modules
are cascaded and used along with a controller.
Select bus master“Yes” when severalWMZ-G1 modules
are cascaded and used without a controller.
VBus®adjustments
Note:
For detailed examples of connection see chap-
ter 7 on page 15 of this manual.

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The flow rate at sensor 1 has fallen below the adjusted
minimum value!
The adjusted maximum relative pressure at sensor 1 is
exceeded!
The relative pressure at sensor 1 has fallen below the ad-
justed minimum value!
The adjusted maximum differential pressure at sensor 1 is
exceeded!
Reports:
Sensor 1
!Min flow alarm
Reports:
Sensor 1
!Max press. alarm
Reports:
Sensor 1
!Min Press. alarm
Reports:
Sensor 1
!Max d.p. alarm
Reports:
Sensor 1
!Min d.p. alarm
The differential pressure at sensor 1 has fallen below the
adjusted minimum value!
Signal failure at sensor 1, signal 1 (temperature).
Signal failure at sensor 1, signal 2 (this can be flow rate,
relative pressure or differential pressure depending on the
sensor type).
The adjusted maximum temperature at sensor 1 is ex-
ceeded!
The temperature at sensor 1 has fallen below the adjusted
minimum value!
The adjusted maximum flow rate at sensor 1 is exceeded!
Reports:
Sensor 1
!Signal 1 fail
Reports:
Sensor 1
!Signal 2 fail
Reports:
Sensor 1
!Max temp. alarm
Reports:
Sensor 1
!Min temp. alarm
Reports:
Sensor 1
!Max flow alarm
Sensor 1

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The adjusted maximum relative pressure at sensor 2 is
exceeded!
The relative pressure at sensor 2 has fallen below the ad-
justed minimum value!
The adjusted maximum differential pressure at sensor 2 is
exceeded!
The differential pressure at sensor 2 has fallen below the
adjusted minimum value!
Reports:
Sensor 2
!Max press. alarm
Reports:
Sensor 2
!Min Press. alarm
Reports:
Sensor 2
!Max d.p. alarm
Reports:
Sensor 2
!Min d.p. alarm
Signal failure at sensor 2, signal 1 (temperature).
Signal failure at sensor 2, signal 2 (this can be flow rate,
relative pressure or differential pressure depending on the
sensor type)
The adjusted maximum temperature at sensor 2 is exceeded!
The temperature at sensor 2 has fallen below the adjusted
minimum value!
The adjusted maximum flow rate at sensor 2 is exceeded!
The flow rate at sensor 2 has fallen below the adjusted
minimum value!
Reports:
Sensor 2
!Signal 1 fail
Reports:
Sensor 2
!Signal 2 fail
Reports:
Sensor 2
!Max temp. alarm
Reports:
Sensor 2
!Min temp. alarm
Reports:
Sensor 2
!Max flow alarm
Reports:
Sensor 2
!Min flow alarm
Sensor 2

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© Caleffi 09351 iSolar_WMZ-G1.monus.indd
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7. Examples of connection
• iSolar WMZ-G1: master board
subaddress: “0”
bus mode: “Active”
iSolarWMZ-G1 module in individual operation mode
iSolar WMZ-G1 with controller • controller: register iSolar WMZ-G1 module
• iSolar WMZ-G1: slave board
subaddress: “0”
bus mode: “Passive”
Cascade without controller • iSolar WMZ-G1 0: master board
subaddress “0”
bus mode: “Cascaded”
bus master: “Yes”
• iSolar WMZ-G1 1 ... 15: slave board
subaddress: 1 ... 15*
bus mode: “Cascaded”
The connection sequence at the VBus® is arbitrary.
Cascade with controller • controller: No adjustments have to be made
(iSolar WMZ-G1 module must
not be registered!)
• iSolar WMZ-G1 0: slave board
subaddress: “0”
bus mode: “Cascaded”,
bus master: “No”
• iSolar WMZ-G1 1 ... 15: Slave board
subaddress: 1 ... 15*
Bus mode: “Cascaded”
The connection sequence at the VBus® is arbitrary.
* The maximum number of cascaded iSolar WMZ-G1 mo-
dules is 16. Whether this number can be reached depends
on the construction.
Disturbing factors can be the following: distances, voltage-
carrying lines etc.
iSolar WMZ-G1 0controller

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Direct SensorsTM is a trademark owned and controlled by
the Grundfos Group.
Distributed by:
Please note:
The design and the specifications are to be changed without notice.
The illustrations may differ from the original product.
Reprinting / copying
This mounting- and operation manual including all parts is
copyrighted. Another use outside the copyright requires
the approval of CALEFFI NORTH AMERICA, Inc. This es-
pecially applies for copies, translations, micro films and the
storage into electronic systems.
Editor: CALEFFI NORTH AMERICA, Inc.
Important notice:
The texts and drawings in this manual are correct to the
best of our knowledge. As faults can never be excluded,
please note:Your own calculations and plans, under consid-
eration of the current standards and directions should only
be basis for your projects.We do not offer a guarantee for
the completeness of the drawings and texts of this man-
ual - 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 / or the resulting dam-
ages.
CALEFFI NORTH AMERICA, Inc.
3883 W. Milwaukee Rd.
Milwaukee,WI 53208
Tel.: [phone]
Fax: [phone]
www.caleffi.us
sales@caleffi.com