Water Piping - Toshiba MMW-AP0271LQ-TR Installation Manual

6

Water piping

WARNING
• Install water pipes according to the regulations of respective
countries.
• Install water pipes in the freeze-free place.
• Make sure that water pipes have sufficient pressure resistance. The
design pressure is 1.0 MPa.
CAUTION
• Do not use zinc plated water pipes. When steel pipes are used,
insulate both ends of the pipes.
• Copper pipes are recommended.
• The water to be used must meet the water quality standard specified
in EN directive 98/83 EC.
• After the vacuuming is completed, carry out the following
procedure before adding refrigerant.
Plate heat exchanger may explode because the water in the plate
heat exchanger frozen.
To avoid this phenomenon, ensure that the VRF system is fully
commissioned, including the control system, before filling the water
circuit.
 Water piping and line heater installation
• Install a suitably sized expansion vessel, 3 bar 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.
29-EN
– 15 –
• 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-AP0271LQ-TR
MMW-AP0561LQ-TR
Water outlet R1-1/4
Water inlet R1-1/4
 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
Capacity of line heater (kW)
3.2~4.0
6.4~8.0
Air vent valve Expansion vessel Pressure relief valve
Set: 0.3 MPa
Isolating Valve
Line
Heater
Strainer Crucial heater source Pump
MMW- AP027
Inlet R1-1/4
Outlet R1-1/4
Copper pipes are recommended
Formed polyethylene foam, thickness: 10 mm or more
Valve for filling and
draining water
AP056
30-EN