Connecting Water Pipes; Water Pipe Insulation - Mitsubishi Electric CITY MULTI PLFY-WP10VFM Installationshandbuch

4. Connecting water pipes

Please observe the following precautions during installation.
4.1. Important notes on water pipework installation
[145psi].
HBC. Failure to do so will result in incorrect running.
end connection numbers.
unused ports can be capped. Without a cap, water will leak.
checkup, and replacement.
vent any excess air.
against breakage and bending.
the remote controller if a test run is performed with the pipe-work installed incorrectly
(inlet connected to outlet and vice versa).
is stopped on low ambient, drain the water out.
1 Wrap the joint with sealing tape following the direction of the threads (clockwise),
do not wrap the tape over the edge.
2 Overlap the sealing tape by two-thirds to three-fourths of its width on each turn.
3 Do not wrap the 1.5th through 2nd farthest threads away from the pipe end.
C
B
A Locally procured insulating material for pipes
A
B Bind here using band or tape.
C Do not leave any opening.
D
E
D
F Unit side insulating material
F
E
Fig. 4-1
A
B
Fig. 4-2
sealing material for water piping over the sealing tape before connection.
- Copper pipes are recommended.
foreign matters.
water pipes and on the valve. Provide an appropriate treatment on the end surface
The details of air purging can be found separately in the water circuit maintenance
manual.
6
A Water pipe: From HBC unit
B Water pipe: To HBC unit

4.2. Water pipe insulation

1. Connect the water pipes of each indoor unit to the same (correct) end connection
numbers as indicated on the indoor unit connection section of each HBC controller.
If connected to wrong end connection numbers, there will be no normal operation.
2. List indoor unit model names in the name plate on the HBC controller control box (for
numbers in the name plate on the indoor unit side.
Seal unused end connections using cover caps (sold separately). Not replacing on
end cap will lead to water leakage.
3. Be sure to add insulation work to water piping by covering water pipework
separately with enough thickness heat-resistant polyethylene, so that no gap is
observed in the joint between indoor unit and insulating material, and insulating
condensation, etc. Pay special attention to insulation work in the ceiling plenum.
[Fig. 4-1]
HBC controller
15 mm or more
-indoor unit
choose a thickness based on the plastic pipe performance.
4. 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.
5. Apply caulking around the ends of the insulation to prevent condensation getting
between the pipework and insulation.
6. Add a drain valve so that the unit and pipework can be drained.
7. Ensure there are no gaps in the pipework insulation. Insulate the pipework right up
to the unit.
8. Ensure that the gradient of the drain pan pipework is such that discharge can only
blow out.