Mitsubishi Electric PURY-EP200 Service Handbook page 33

[ II Restrictions ]
(8) Demand control
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 SW4-4 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
P250-P400YHM-A and EP200-EP300YHM-A models (single-outdoor-unit system) : 2 and 4 steps shown in the rows 1 and 2
in the table above only.
P500-P800YSHM-A and EP400-EP600YHM-A(1) 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 External signal is input to CN3D on the outdoor unit whose SW4-4 is set to ON. When SW4-4 is set to OFF on all outdoor units,
the signal is input to the CN3D on the OC.
Outdoor units whose SW4-4 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 SW4-4 is set to OFF.
When SW4-4 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.
2) 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 SW4-4 is set to ON on an outdoor unit)
Demand capacity is shown below.
CN3D
1-3P
Open
Close
8-step demand control (When SW4-4 is set to ON on two outdoor units)
Demand capacity is shown below.
8-step demand
No.1 CN3D
*1. The outdoor units whose SW4-4 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 SW4-4 is set to ON are designated as OC and OS, OC=No. 1 and OS=No. 2.
HWE0713A
100%
0%
1-2P
Open
100%
0%
1-2P
1-2P 1-3P
Open Open
Short-circuit
Short-circuit Open
Short-circuit
DipSW4-4
Input to CN3D*
OC OS
OFF OFF OC
ON OFF OC
O FF ON OS
ON ON OC and OS
Close
75%
50%
No.2 CN3D
Open
Open Short-circuit
100% 50%
50% 0%
88% 38%
75% 25%
- 24 -
2
Short-circuit
Open Short-circuit
88% 75%
38% 25%
75% 63%
63% 50%
GB