McQuay MDS030A Design & Installation Guide

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Design & installation Guide For McQuay MDS Multi System
（Unit: mm）
Outer diameter
Outer diameter
Metric system English system
Ф6.35 1/4 ＂ 9.0
Ф9.52 3/8 ＂ 13.0
Ф12.7 1/2 ＂ 16.2
Ф15.88 5/8 ＂ 19.4
Ф19.05 3/4 ＂ 23.3
Outer diameter
Outer diameter
Metric system English system
Ф6.35 1/4 ＂ 17.0
Ф9.52 3/8 ＂ 22.0
Ф12.7 1/2 ＂ 24.0
Ф15.88 5/8 ＂ 27.0
Ф19.05 3/4 ＂ 36.0
The following table shows the dimension of the nut of the flare fitting nut. （Unit: mm）
■ When connecting the liquid pipe and liquid stop valve, align the center of the flare fitting of the liquid pipe to
that of the stop valve, and then tighten with a moment wrench. Whether tightened with the wrench depends
on the setting of the wrench range and the tightening angle. The following table shows the external pipe
diameter, the corresponding tightening moment and the tightening angle.
Outer diameter (mm) Tightening moment (N
.
m) Tightening angle(
o
)
Ф6.35 14～18 60～90
Ф9.52 35～42 60～90
Ф12.7 50～57.5 30～60
Ф15.88 75～80 30～60
Ф19.05 100～140 20～35
■ The following table shows the dimension of the copper flare fitting.
Globe valve (liquid side)
Globe valve (gas side)
A Valve handle
(Before pipe connection, vacuum pumping and additional refriger-
ant filling for delivery, make sure this valve is closed completely.
After the above operations, please fully open it.)
B Stop pin (prevent the valve handle from turning over 90 degrees)
C Sealing plate (annex)
D Connection pipe (annex)
Install the pipe firmly to the valve flange with the sealing plate to
avoid gas leakage.
E Open (slow operation)
F Cap and copper spacer
Remove the cap and operate the handle. After the operation, reinstall
the cap. The moment to tighten the valve handle cap is 23 Nm to 72
Nm.
G Access opening
Pump vacuum for the refrigerant pipe through this access opening,
and fill additional refrigerant on the site. Open and close the access
opening with a double-end wrench. After the operation, reinstall the cap. The moment to tighten the access opening
cap is 12 N·m to 15 N·m.
H Flare fitting
For the tightening moment, refer to the figure in next page. Loosen and screw up the screw with a double-end
wrench. Coat refrigerant oil on the contact surface of the flare fitting (Type R22 mineral oil is applicable).
K Field connection pipe
Braze to the connection pipe. (Please use non-oxidative brazing materials)

McQuay MDS030A Specifications

General

Brand	McQuay
Model	MDS030A
Category	Air Conditioner
Language	English