Solar Thermal Information

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Energy meter

WMZ-G1

Function

Product range

Technical specifications

System diagram

CALEFFI

DataLogger

The connection sequence is arbitrary, up to 16 can be cascaded together

WMZ-G1 Calorimeter module for Grundfos Direct Sensors™

Article-no: 135 307 03

Grundfos Direct Sensor™ VFS 1-12 or 20? l Sensor incl. brass fitting, insert and connection

cable

Article-no: 130 000 20

Grundfos Direct Sensor™ VFS 2-40 l Sensor incl. brass fitting, insert and connection cable

Article-no: 130 000 30

Grundfos Direct Sensor™ RPS 0-10 bar Sensor incl. brass fitting and connection cable

Article-no: 130 000 40

The WMZ-G1 is an energy meter for thermal solar systems and conventional

heating systems. The WMZ-G1 calculates energy by integrating ﬂow rate and

temperature from a Vortex Flow Sensor (VFS) Grundfos Direct Sensors

™ and

temperature difference in the ﬂow and return piping using a Relative Pressure

Sensor (RPS) Grundfos Direct Sensors

™. The calculated heat energy value is

displayed in kWh (kilowatt hours) and stored. A power failure protection guaran-

tees that the adjusted system parameters and the calculated heat energy

quantity are maintained in the case of power loss.

Grundfos Direct Sensors

™

Technology

The VFS combines the established vortex principle with the direct exposure of

the sensor chip to the media gives a superior sensitivity and fast response. The

VFS sensor detects the pressure pulsation generated by the vortices and

converts the pulsation and temperature into an electrical output signal. The VFS

sensor has shown to be 5 times higher in accuracy with faster ﬂow response

than most common turbine ﬂow meters. The RPS sensor transforms the

pressure and temperature of the medium into electrical signals. The pressure

signals are linearized to compensate for temperature variations.

The Relative Pressure Sensor (RPS) and Vortex Flow Sensor (VFS) are

combined temperature sensors intended for use with boilers in a central

heating circuit. The Relative Pressure Sensor 0-10 bar The direct

exposure of the sensor chip to the media gives a superior sensitivity and

thereby fast pressure response. Dry-running protection in solar systems

and gas boilers

Relative Pressure Sensor:

The heart of the sensor is a coated SMART sensor, which transforms the

pressure in and temperature of the medium into electrical signals. These

signals are calibrated, conditioned and presented in analogue or digital

format by means of a microprocessor. The pressure signals are tempera-

ture compensated and linearized for the inﬂuence of temperature

variations.

The Vortex Flow Sensor 1-20 liter per minute The sensor has shown a 5

times higher accuracy than most common turbine ﬂow meters available -

and a faster ﬂow response. A compact solution enables ﬂexible design

possibilities, minimal permanent pressure loss and a vibration tolerable

sensor.The sensor is unaffected by the temperature, density and viscos-

ity of the media.

Vortex Flow Sensor:

By combining the established vortex principle (von Karman, 1912) with

the unique metal-glass coating, Silicoat® from Grundfos an affordable,

accurate and direct ﬂow sensor for aggressive media is now available.

The ﬂow sensor is without any moving parts, which can deteriorate or

commence clogging. The Vortex Street generates two series of

turbulence (vortices) shedding behind a bluff body By increasing ﬂow the

frequency of the vortices will increase and the frequency increases

directly proportional to the ﬂow in a full pipe. The Vortex Flow Sensor

consists of a sensor, Vortex Tube and element. The sensor detects the

pressure pulsation generated by the vortices, and converts the pulsation

into an electrical output signal. The frequency of the pressure pulsation is

a measurement of the velocity and in the deﬁned ﬂow pipe the actual ﬂow

is measured.

2in1 Flow and Temperature Sensor.

Fast temperature response thru direct media contact.

1.5% FS accuracy.

Compact, robust and cost-effective solutions

2in1 Pressure and Temperature Sensor.

?Accurate, linearized and temperature-compensated pressure reading.

Additional WMZ-G1 energy meters can be cascaded together on the

VBus connection. One WMZ-G1 is conﬁgured as the master and

additional WMZ-G1 meters are conﬁgured as slaves. Up to 16

meters can be cascaded together with two conductor wire (bell wire) at

least 20 AWG and up to 150 feet for transmission of data values to a

connected PC or DL2 datalogger.

Optional

Datalogger

VFS sensor

RPS sensor

WMZ-G1

WMZ-G1 energy meter

Housing plastic: PC-ABS

Display: 4 lines LCD

Inputs: 2 Grundfos Direct Sensors

Output: 1 relay

Switching relay capacities: 2 (1) A 24V=

Interface: VBus data connection

Power supply: 24V AC or DC

Vortex Flow Sensor (VFS)

Flow measuring range: NA15015 0.25 - 3 gpm (1-12 lpm)

NA15016 0.50 - 10 gpm (2-40 lpm)

Flow accuracy: 1.5%

Flow response time: < 1 sec.

Relative Pressure Sensor (RPS)

Pressure measuring range: 0 - 150 psi (0-10 bar)

Pressure accuracy: 2% FS

Pressure response time < 1 sec.

VFS and RPS temperature specifications

Max. ﬂuid temperature: 250º F (120ºC)

Temperature accuracy range: 32 - 210ºF (0-100ºC)

Temperature accuracy: 2%

Temperature response time: < 1sec.

Suitable ﬂuids: water, glycol solution

Max percentage of glycol: 50%

Materials: - Body: brass

- Seals: EPDM

- Sensor housing: composites (PPS, PA66)

Connection: 1” male union thread

Optional separate ﬁttings: 1/2”, 3/4” & 1” sweat tail pieces and union nuts

Code 257202A WMZ-G1 Heat energy meter functions with VFS ﬂow/temperature sensor and RPS pressure/temperature sensors

Code NA15014 RPS Grundfos Direct Sensors

2 in 1 Pressure / temperature sensor 0 - 150 psi / up to 250º F, includes connecting wire

Code NA15015 VFS Grundfos Direct Sensors

2 in 1 Flow / temperature sensor 1/4 - 3 gpm / up to 250º F. includes connecting wire

Code NA15016 VFS Grundfos Direct Sensors

2 in 1 Flow / temperature sensor 1/2 - 10 gpm / up to 250º F. includes connecting wire

balance values

heatmeter

heat 6235 KWh

Multinode network

The trademark Grundfos Direct Sensors™ is owned and controlled by the Grundfos group.

(shown with optional 3/4” sweat unions)

(not included)

DataLogger

DL2

Function

Product range

Code 257201A DL2 data logger connects to VBus data terminals on iSolar controllers

Technical specifications

CALEFFI

Dimensions

3/4”

1/8”

4 7/16”

1/4” mount

Code

257201A

Weight (lb)

3.0

Router

Connection

Connect the datalogger (pos.1) to other modules in the following order:

1. Connect the VBus data wire (pos.3) to the iSolar controller (pos.4).

Extend, if necessary with twisted pair wire up to 150 feet.

2. Plug power adapter (pos.2) into the AC outlet.

3. Connect the datalogger to the network router (pos. 7) by means of

the network cable (enclosed, pos.6).

4. Connect PC (pos. 8) to the router (pos. 7) by a network cable

Integrated Web interface

The DL2 data logger enables the acquisition and storage of large amounts of

data (such as energy metering and recorded values of the solar system) over a

long period of time when connected to an iSolar controller. The DL2 is compat-

ible with all iSolar controllers with VBus data connection terminals and is

connected to the VBus with two conductor wire (bell wire) at least 20 AWG up to

a distance of 150 feet.

The DL2, when connected to a network through the integrated ethernet socket,

can be conﬁgured and viewed with any standard internet browser via its

integrated web interface. A conﬁguring IP address and password protection

allows for access from any PC with an internet connection for system monitoring

of energy metering or for reviewing system performance, without additional

software. Download data through the web interface or an SD memory card for

further data processing in spreadsheet programs

Housing: PC-ABS Thermoplastic

Protection type: indoor

Ambient temperature: 32 ... 100º F (0 ... 40º C)

Mounting: wall

Display: bar LED

Input voltage: 5V DC ± 5 %

Power voltage adapter: 100 ... 240 V~

Rated current: 350 mA

Ethernet connection: integrated socket

Data access integrated SD slot

Memory: 180 MB internal memory

CALEFFI

Flexible stainless steel insulated piping

SolarFlex

NA3500

Function

SolarFlex is a system solution with pre-insulated flow and return

pipes for solar hot water heating systems used to connect the solar

collector with the storage tank in an easy, quick and professional

way. It optimizes thermal efficiency of the entire system. The pre-

insulation solution of two flexible stainless steel pipes inside two

EPDM closed cell insulation and the integrated sensor cable, saves

time and reduces cost of installation. SolarFlex is packaged in a 50-

foot continuous coil with a complete range of accessories to ensure

a smoothand secure installation.

General

• Easy to install, enabling pipes to be run without using a torch

in confined spaces or on the roof.

• Ensures a leak-free installation.

• Easy to separate, without damaging the tubes.

• External copolymer foil protects against UV radiation

and mechanical strain.

• Identification mark for flow and return.

• Meets highest requirements for modern solar heating systems.

• Pre-insulated feed and return pipes can be joined easily

without special tools.

Technical specifications

Materials:

- pipe: two corrugated stainless steel 316L

- insulation: two closed cell elastomer UV resistance EPDM

- outer cover: UV resistant polyolefin copolymer foil

Insulation thickness: 5/8 inch (16mm)

Thermal conductivity: 0.215 BTU-in/hr-ft

-°F (0.031 W/mK)

Thermal resistance: R-4.2

Max. working pressure: 150 psi (10 bar)

Max. fluid temperature: 350ºF (175ºC)

Min. surface temperature: -60ºF (-50ºC)

Length per coil: 50 feet (15m)

Fluid capacity per foot: 1/2" - 0.0219 gallons (0.08 liters)

3/4" - 0.0346 gallons (0.13 liters)

1" - 0.0509 gallons (0.19 liters)

Min. bending radius: 5 inch (130mm)

Pessure loss:

Approx. 25% more than in a comparable smooth pipe

Flammability: Class VO

Flame spread/smoke density 25/50

Agency approvals: ASTM D 635

ASTM C 177

AB C D

1" 1 - 1/4 " 4 -

7/16

1/2

Code

1/ 2" 11/16 " 4 " 2 "

NA3520 - 15

NA3560 - 15

Weight (lb/f)

3/4" 15/16 " 4 -

3/8

1/8

NA3540 -15

0.5

0.4

0.7

Product range

NA3520-15 1/2" SolarFlex pipe 50' coil including (2) double nipples, (4) union nuts, 4 segment rings and 4 washers

NA3540-15 3/4" SolarFlex pipe 50' coil including (2) double nipples, (4) union nuts, 4 segment rings and 4 washers

NA3540- B 3/4" SolarFlex pipe bulk cut to length up to 164 foot. Without connection fittings.

NA3560-15 1" SolarFlex pipe 50' coil including (2) double nipples, (4) union nuts, 4 segment rings and 4 washers

Dimensions