Selection Of An Outdoor Unit Side Branching Pipe Set; Selection Of An Indoor Unit Side Branching Pipe Set - Mitsubishi Heavy Industries Hi-COP Series Service Manual

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Table of Contents

(e) Selection of pipe between outdoor branch pipes for 3-unit combination: Section E in Figure 1

Size of pipe between outdoor branch pipes varies depending on the capacity of outdoor unit which is connected to second branch pipe in the outdoors.

Select it from the following table.

Total capacity of outdoor units connected

to second branch pipe in the outdoors

500

560

615

670

Use C1220T-1/2H material for φ19.05 or larger.

(4) Selection of an outdoor unit side branching pipe set

This branching pipe set will always become necessary when units are used in combination.

(When a unit is used as a standalone installation, it is not required)

Please note

a) In connecting an outdoor unit, please use a pipe conforming to the pipe size speciﬁed for outdoor unit connection.

b) Choose a different-diameter pipe joint matching a main pipe size speciﬁed in the above section in installing pipes (= main pipes) on the outdoor unit side.

c) Always install branching pipe (for both gas and liquid) in such a manner that they form correct horizontal branch.

Horizontal

Floor surface

Incline branching pipes within

±15°against the ﬂoor surface.

(5) Selection of an indoor unit side branching pipe set

(a) Method of selecting a branching pipe set

As an appropriate branching pipe size varies with the connected capacity (total capacity connected

●

downstream), determine a size from the following table.

Please note

In connecting an indoor unit with the indoor unit side branching pipe set, please use a pipe

●

conforming to the pipe size speciﬁed for indoor unit connection.

Always install branching pipes (both gas and liquid pipe) either horizontally or vertically.

●

Floor surface

(b) Header Method

Depending on the number of units connected, connect plugged pipes (to be procured on the installer's part) at a branching point (on the indoor unit connection side).

●

For the size of a plugged pipe, please refer to the documentation for a header set (optional part).

●

Total capacity downstream

Less than 180

180 or more but less than 371

371 or more but less than 540

540 or more

Please note

a) In connecting a header with an indoor unit, please use a pipe conforming to the pipe size speciﬁed for indoor unit connection.

b) In installing a header, always arrange a gas-side header to branch horizontally and a liquid-side header to branch downward.

c) Indoor units 224 and 280 can not be connected to the header.