Mitsubishi Heavy Industries HMK60, Installation Manual

Page: 223 / 288

17
Pipe installation
Water circuit
Connection to heating system
Connect XL1 to supply line and X2 to return line from
heating system.
■ All required safety devices and shut-off valves must be
installed as close to the indoor unit as possible.
■ Install bleed valves where necessary, highest point of the
water system in usual case.
■ When connecting to a system with thermostats on all
radiators, install an overfl ow valve or remove some of the
thermostats to ensure suffi
cient fl ow.
■ See section Dockings on page 22 for outline diagram.
■ Install a safety valve with manometer on heating circuit and
hot water circuit. (FL2)
For HSB140 install a safety valve for heating circuit on the
water pipe returning to indoor unit since it doesn’t have
port for FL2.
The entire length of the overfl ow water pipe from the safety
valves must be inclined to prevent water pockets and must
also be frost proof.
■ The end of overfl ow water pipe from the safety valves must be
left open to the atmosphere. The water may drip from the pipe.
HSB140
XL14 XL1 XL13 XL2
Install safety valve as close to XL2 as possible.
Connection to hot water heater
For HSB140 indoor unit, it is necessary to connect PT500
tank unit applying 3 way valve in order to use domestic hot
water function.
Housing disassembly of tank unit
Removable housing with thermal insulation facilitates trans-
port and installation of the storage tank. Disassembly the ho-
using in the following order (see next pages fi gure):
1. Remove the Temperature gauge, plug of the heating ele-
ment connector pipe and blanking plate of the inspection
opening.
2 Remove the upper cover of the housing together with
thermal insulation.
3. Remove the plugs from the connector pipes and black
bushings.
4. Remove the fixing screws and the strip connecting the
housing jacket.
5. Remove the jacket surrounding the tank (housing jacket.)
6. Remove the four-piece thermal insulation.
After the installation of the storage tank in its fi nal location,
reinstall the removed components in the reverse order.