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Demand Control Overview - Mitsubishi Electric PURY-HP72 Service Handbook

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[2-5 Demand Control Overview ]

2-5

Demand Control Overview

(1) General outline of control
Demand control is performed by using the external signal input to the 1-2 and 1-3 pins of CN3D on the outdoor units (OC and OS).
Between 2 and 8 steps of demand control is possible by setting Dip SW6-8 on the outdoor units (OC and OS).
No
Demand control switch
1
2 steps (0-100%)
2
4 steps (0-50-75-100%)
3
8 steps
4
(0-25-38-50-63-75-88-100%)
*1 Available demand functions
HP72 - HP96T(Y)KMU-A(-H) models (single-outdoor-unit system) : 2 and 4 steps shown in the rows 1 and 2 in the table above
only.
HP144 - HP192T(Y)KMU-A(-H) models (two-outdoor-unit system OC+OS) : 2-8 steps shown in the rows 1, 2, 3, and 4 in the
table above only.
*2 Signal is input to CN3D on the outdoor unit whose SW6-8 is set to ON. When SW6-8 is set to OFF on all outdoor units, the
signal is input to the CN3D on the OC.
Outdoor units whose SW6-8 is set to ON are selectable in a single refrigerant system.
*3 If wrong sequence of steps are taken, the units may go into the Thermo-OFF (compressor stop) mode.
Ex) When switching from 100% to 50%
(Incorrect) 100%→0%→50% The units may go into the Thermo-OFF mode.
(Correct) 100%→75%→50%
*4 The percentage of the demand listed in the table above is an approximate value based on the compressor volume and does
not necessarily correspond with the actual capacity.
*5 Notes on using demand control in combination with the low-noise mode
To enable the low-noise mode, it is necessary to short-circuit 1-2 pin of CN3D on the outdoor unit whose SW6-8 is set to OFF.
When SW6-8 is set to ON on all outdoor units, the following operations cannot be performed.
Performing 4-step demand in combination with the low-noise operation in a single-outdoor-unit system.
Performing 8-step demand in combination with the low-noise operation in a two-outdoor-unit system.
1) Contact input and control content
2-step demand control
The same control as the Thermo-OFF is performed by closing 1-3 pin of CN3D.
CN3D
1-3
Open
Close
4-step demand control (When SW6-8 is set to ON on an outdoor unit)
Demand capacity is shown below.
CN3D
1-3P
Open
Close
8-step demand control (When SW6-8 is set to ON on two outdoor units)
Demand capacity is shown below.
8-step demand
No.1 CN3D
1-2P
Open
Close
*1. The outdoor units whose SW6-8 is set to ON are designated as No. 1 and No. 2 in the order of address from small to large.
Ex) When outdoor units whose SW6-8 is set to ON are designated as OC and OS, OC=No. 1 and OS=No. 2.
HWE13080
Dip SW6-8
OC
OFF
OFF
ON
OFF
OFF
ON
100%
0%
1-2P
Open
Close
100%
75%
0%
50%
1-2P
1-3P
Open
Open
100%
Close
50%
Open
88%
Close
75%
- 29 -
2
Input to CN3D*
OS
OC
OC
ON
OS
ON
OC and OS
No.2 CN3D
Open
Close
50%
88%
0%
38%
38%
75%
25%
63%
Close
Open
Close
75%
25%
63%
50%
GB

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