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Water piping and line heater installation
• Install a suitably sized expansion vessel, 3 bar (0.3 MPa) pressure relief valve, water drain, and fill valve
(procured locally).
Follow all local regulations for the installation of closed circuit heating systems.
• Make the piping route a closed circuit. (An open water circuit may cause a failure.)
• Before a long period of none use, purge the water out of the pipes and thoroughly let them dry.
Do not add brine to the circulating water.
• Do not use the water used for the unit for drinking or food manufacturing.
• To insure easy maintenance, inspection, and replacement of the unit, use a proper joint, valve, etc (procured
locally) on the water inlet and outlet port.
• Be sure to install a strainer with 30 to 40 meshes (procured locally) on the water inlet pipe. If a strainer is not
installed, this may cause impaired performance, or damage to the plate heat exchanger from freezing.
• Install a suitable air vent (procured locally) on the water pipe. After sending water through the pipe, be sure to
vent the excess air.
• Be sure to attach the air vent valve vertically at the highest possible place where air tends to rise.
• To avoid water leak, wrap some sealing tape around the screw part.
• Water pipes can get very hot, depending on the preset temperature. Wrap the water pipes with heat insulation
(procured locally) to prevent burns.
• Be sure to install the line heater (procured locally) on the water inlet side. In addition, position it within 5 m of the
water inlet pipe of the hot water module.
• Follow the table below to select a line heater (procured locally) within the range of 40 to 50% of the hot water
module's rated capacity.
Hot water module model name Capacity of line heater (kW)
MMW-UP0271LQ-E 3.2~4.0
MMW-UP0561LQ-E 6.4~8.0
Water outlet R1-1/4
Air vent valve
Isolating Valve
Water inlet R1-1/4 Strainer Crucial heater source Pump
Line
Heater
Valve for filling and
draining water
Expansion vessel
Pressure relief valve
Set: 0.3 MPa
Pipe size, material and insulator
The following specification for piping work and insulating process are procured locally.
Model MMW- UP027 UP056
Connecting pipe
(unit side)
Water pipe
Inlet R1-1 / 4
Outlet R1-1 / 4
Connecting pipes material Copper pipes are recommended
Insulator Formed polyethylene foam, thickness: 10 mm or more
41-EN 42-EN
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