Mitsubishi Heavy Industries FDCW100VNX-A, Technical Manual

Page: 88 / 315

Installation
'19 • HM-T-340
Water circuit
Connection to heating system
Connect XL1 to supply line and X L 2 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 overflow valve or remove some of the
thermostats to ensure sufficient flow.
■
■
Install a safety valve with manometer on heating circuit and
hot water circuit. (FL2)
For HSB series 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 overflow water pipe from the safety
valves must be inclined to prevent water pockets and must
also be frost proof.
The end of overflow water pipe from the safety valves must
left open to the atmosphere. The water may drip from the pipe.
HSB series
XL14 XL1 XL13 XL2
Install safety valve as close to XL2 as possible.
HMK series
XL9 XL8 XL3
XL5 XL4 XL2 XL1
XL10
XL11
Install safety valve FL2 on XL11.
Connection to hot water heater
For HSB series indoor unit, it is necessary to connect PT
tank unit applying 3-way valve in order to use
domestic hot water function.
For HMA-S series indoor unit, 180L tank unit is integrated
in indoor unit.
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 page figure):
- e l e g n it a e h e h t f o g u l p , e g u a g e r u t a r e p m e t e h t e v o m e R . 1
ment connector pipe and blanking plate of the inspection
opening.
h ti w r e h t e g o t g n i s u o h e h t f o r e v o c r e p p u e h t e v o m e R 2
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.
Indoor unit installation
HMA-S series
XL11 XL10 XL4 XL13 XL14 XL3
XL2
XL1
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