Mitsubishi Electric HYBRID CITY MULTI PURY-M200-300YNW-A Data Book page 47

11. PIPING DESIGN
5. Leakproof the water pipework, valves and drain pipework. Leakproof all the way to, and include pipe ends so that condensation
cannot enter the insulated pipework.
6. Apply caulking around the ends of the insulation to prevent condensation getting between the pipework and insulation.
7. Add a drain valve so that the unit and pipework can be drained.
8. Ensure there are no gaps in the pipework insulation. Insulate the pipework right up to the unit.
9. Ensure that the gradient of the drain pan pipework is such that discharge can only flow out.
10. HBC water pipe connection sizes and pipe sizes.
Water inlet
Indoor unit
(WP10-WP50)
Indoor unit Rc 1-1/4
(WP63-WP125)
To outdoor/heat source unit
Auto air vent valve
(Highest point on the water pipe for each branch)
(field supply)
Shutoff valve (field supply)
Note: 1
To connect multiple indoor units to a port
Maximum total capacity of connected indoor units: WP80 or below
Maximum number of connectable indoor units: 3 units
Branch joints are field-supplied.
All the indoor units that are connected to the same port must be in the same group and Thermo-ON/OFF operation
simultaneously. For all the indoor units in the group, the room temperature needs to be monitored via the connected
remote controller.
When connecting a WP71 through 125 model of indoor unit to an HBC controller, the pipes connecting the unit to
the same set of HBC controller ports cannot be branched out to connect additional units.
When connecting multiple indoor units including a WP63 unit to the same set of HBC ports, use a size 32A pipe in
the section indicated as "b' and c" and connect the WP63 unit to the pipe indicated as "c" in the figure.
(See page 38.)
Note: 2
Connecting WP100 or 125 indoor units to an HBC controller
When connecting WP100 or 125 indoor units to an HBC controller, connect each unit to two sets of two ports on the
HBC controller, using two Junction pipes (Y-joints). (See Fig. 11-2-1A.)
Connect an increaser (20A-to-32A) to the merged side of each junction pipe. (See Fig. 11-2-1A.)
When connecting junction pipes to HBC ports, the branched sides of the junction pipes cannot be connected to
combinations of ports "4 and 5," "8 and 9," or "12 and 13." (See Fig. 11-2-1B.)
When connecting a WP100 or a 125 model of indoor unit to an HBC controller, the pipes connecting the unit to the
same set of HBC controller ports cannot be branched out to connect additional units.
Note: 3
Maximum connectable capacity of indoor units to HBC
HBC has two pumps. Each pump can accommodate the capacity of indoor units equivalent to P175.
Make sure that the total capacity of the indoor units connected to "ports 1 through 4 and 9 through 12" or "5 through
8 and 13 through 16" will not exceed P175. (See Fig. 11-2-1B.)
MEES17K104
Connection size
Water outlet Water out
Rc 3/4 Rc 3/4
I.D. 20 mm
screw screw
Rc 1-1/4
I.D. 35 mm
screw screw
End connection (brazing)
Main-HBC controller
Indoor Indoor
unit unit
Pipe size
Water return
I.D. 20 mm
I.D. 35 mm
Sub-HBC controller
Twinning pipe (field supply)
Water pipework
Indoor Indoor
unit unit
Up to three units for 1 branch hole;
total capacity: below 80
(but in same mode, cooling/heating)
R2-Series
Pressure control valve
(field supply)
Indoor Indoor
unit unit
*1
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