11-4.Water Piping - Mitsubishi Electric City Multi PURY-M200YNW-A1 Data Book

11. PIPING DESIGN
・When the piping length from the outdoor unit to the farthest HBC controller is longer than 10 m
Amount of
additional charge (kg)
■ Limitation of the amount of refrigerant to be charged
The above calculation result of the amount of refrigerant to be charged must become below the value in the table below.
Total index of the outdoor units
Factory charged kg
Maximum refrigerant charge Charged on site kg
Total for system kg
11-4. Water piping
11-4-1. Precautions for water piping
Consider the following when installing a water piping system.
1. Design pressure of the water piping
Use a water pipe that is strong enough to withstand the design pressure (1.0 MPa).
2. Water pipe type
Use of plastic pipe is recommended.
When using copper pipes, be sure to braze the pipes under a nitrogen purge. (Oxidation during may shorten the
life of the pump.)
3. Expansion vessel
Install an expansion vessel to accommodate expanded water.
4. Drain piping
Install the drain pipe with a downward inclination of between 1/100 and 1/200. To prevent drain water from freez-
ing in winter, install the drain pipe as steep an angle as practically possible and minimize the straight line. For
cold climate installation, take an appropriate measure (e.g., drain heater) to prevent the drain water from freezing.
5. Insulation
Cover the water pipe with insulating materials with the specified thickness or more to prevent thermal loss or con-
densation from collecting.
6. Air vent valve
Install air vent valves to the highest places where air can accumulate.
7. Maintenance valve
It is recommended to install valves on the inlet/outlet for each HBC controller branch for maintenance.
8. Water pressure gauge
Install a water pressure gauge to check the charged pressure.
MEES18K068
High-pressure pipe High-pressure pipe
= ø22.2 total length + ø19.05 total length
× 0.19 (kg/m) × 0.13 (kg/m)
Outdoor unit model Amount (kg)
(E)M200 1.0
(E)M250 1.0
(E)M300 0
+
(E)M350 0
(E)M400 0
(E)M450 0
(E)M500 0
* Amount of refrigerant to be charged
for single-module units
M200 M250 M300
YNW YNW YNW
5.2 5.2 5.2
13.5 13.5 15.5
18.7 18.7 20.7
High-pressure pipe
+ ø15.88 total length
× 0.09 (kg/m)
Amount
(kg/HBC controller)
+
2.8
M350 M400 M450 M500 EM200
YNW YNW YNW YNW YNW
8.0 8.0 10.8 10.8 5.2
15.5 19.5 19.5 19.5 13.5
23.5 27.5 30.3 30.3 18.7
EM250 EM300 M350 EM400 EM450 EM500
YNW YNW YNW YNW YNW
5.2 5.2 8.0 8.0 10.8
13.5 15.5 15.5 19.5 19.5
18.7 20.7 23.5 27.5 30.3
R2-Series
YNW
10.8
19.5
30.3
84