Brochure
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$-$1&8'$ 3,$3$12
WMZ-G1 intelligent kWh energy heat meter
with VBus data connection. Requires VFS
and RPS sensors purchased separately.
Temperature measurement range: 32—210ºF.
Pressure measuring range: 0—150 psi.
Inputs: 2 Grundfos Direct analog sensors.
Alarm relay capacities: 1 A 24 V AC/DC
Interface: VBus data connection.
Power supply: 24 V AC/DC.
Code Description Pk Lbs USD
NA15010 RPS 0—10, 0—150 psi 1 0.3 189.00
Code Description Pk Lbs USD
257202A G1 Energy heat meter 1 2.0 595.00
Code Description Pk Lbs USD
NA15014 RPS 0—10, 0—150 psi 1 0.6 232.20
Code Description Pk Lbs USD
NA15015 VFS 1-12, ¼—3 gpm 1 0.6 318.60
NA15016 VFS 2-40, ½—10 gpm 1 0.6 351.00
NA15017 VFS 5-100, 1½—15 gpm 1 1.6 610.20
Code Description Pk Lbs USD
NA15018 VFS 10-200, 2½—20 gpm, 1" sweat 1 1.7 864.00
NA15019 VFS 20-400, 5—45 gpm, 1¼" sweat 1 3.8 1,296.00
Code Description Pk Lbs USD
NA15030 VFS & RPS cable, 10’ length 1 0.1 25.00
RPS Grundfos analog pressure/ temperature
sensor. Reguires NA15030 cable.
Pressure measuring range: 0—150 psi.
Temperature measurement range: 32—210ºF.
Max. fl uid temperature: 250ºF
Maximum Glycol: 50%.
Connection: ½" male NPT.
RPS Grundfos analog pressure / temperature
sensor. In-line body. Reguires NA15030 cable.
Pressure measuring range: 0—150 psi.
Temperature measurement range: 32—210ºF.
Max. fl uid temperature: 250ºF
Maximum Glycol: 50%.
Connection: 1" male union thread.
Select union fi ttings on page 68.
VFS Grundfos analog fl ow / temperature
sensor. Reguires NA15030 cable.
Temperature measurement range: 32—210ºF.
Max. fl uid temperature: 250ºF
Flow measurement accuracy: 1.5%
Flow response time: < 1 sec.
Brass or stainless in-line body.
Maximum glycol: 50%.
Connection: 1" male union thread.
Select union fi ttings on page 68.
Flow measurement accuracy: 1.5%
Flow response time: <1 sec.
VFS Grundfos analog fl ow / temperature
sensor. Reguires NA15030 cable.
Temperature measurement range: 32—210ºF.
Max. fl uid temperature: 250ºF
Flow measurement accuracy: 1.5%
Flow response time: < 1 sec.
Composite in—line body.
Sweat unions included.
Maximum glycol: 50%.
Flow measurement accuracy: 1.5%
Flow response time: <1 sec.
The WMZ-G1 is a energy heat meter for solar thermal systems and conven-
tional heating or cooling systems. The WMZ-G1 calculates heat by integrat-
ing fl ow rate from a Grundfos Vortex Flow Sensor (VFS) and temperature
difference in the supply and return piping using either Grundfos Relative
Pressure Sensor (RPS) or VFS sensors. The calculated heat energy value is
displayed in kWh (kilowatt hours) and stored. Memory protection guarantees
that the adjusted system settings and the calculated heat energy quantity are
maintained in the case of power loss.
Function
DataLogger
Additional WMZ-G1 energy meters can be cascaded together on the VBus
connection. One WMZ-G1 is confi gured as the master and additional
WMZ-G1 meters are confi gured 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 DL datalogger.
Multi node network
The connection sequence is arbitrary, up to 16 can be cascaded together.
257
WMZ-G1
Cable for connecting Grundfos VFS & RPS
(molded plug) to WMZ-G1 terminal block
(4 wire pins).
NA150
tech. broch. 01272tech. broch. 01272