Toshiba MMW-AP0481CHQ-E Installation Manual page 17

 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.
• In case of installing 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
MMW-AP0481CHQ-E
Water outlet R1-1/4
Water inlet R1-1/4
31-EN
Capacity of line heater (kW)
5.8 ~ 7.2
Pressure relief valve
Air vent valve Expansion vessel
Set: 0.3 MPa
Isolating Valve
Line
Heater
Auxiliary Valve for filling and
Pump
Strainer
draining water
heater source
 Pipe size, material and insulator
The following specification for piping work and insulating process are procured locally.
Model
Connecting pipe
Water pipe
(unit side)
Connecting pipes material
Insulator
CAUTION
Since the water pipe becomes high temperature (about 90
(procured locally).
– 16 –
MMW- AP048
Inlet R1-1/4
Outlet R1-1/4
Copper pipes are recommended
Formed polyethylene foam, thickness: 10 mm or more
), wrap around the pipe with heat insulation
°C
32-EN