Mitsubishi Electric PUHY-RP200 Service Handbook page 36

[ II Restrictions ]
1. 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,
OS1, and OS2).
Between 2 and 12 steps of demand control is possible by setting DIP SW4-4 on the outdoor units (OC, OS1, and OS2).
Table.1
No Demand control switch
(a) 2 steps(0-100%)
(b) 4 steps(0-50-75-100%)
(c)
(d)
(e) 8 steps(0-25-38-50-63-75-88-100%)
(f)
(g)
(h) 12 steps(0-17-25-34-42-50-59-67-75-
84-92-100%)
*1. Available demand functions
RP200 - RP350YJM models (single-outdoor-unit system): 2 and 4 steps shown in the rows (a) and (b) in the table above
only.
RP400 - RP650YSJM models (two-outdoor-unit system OC+OS1): 2-8 steps shown in the rows (a), (b), (c), and (e) in the
table above only.
RP700 - RP900YSJM models (three-outdoor-unit system OC+OS1+OS2): 2-12 steps shown in the rows (a)-(h) in the table
above.
*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% to 0% to 50% : The units may go into the Thermo-OFF mode.
(Correct) 100% to 75% to 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.
Performing 12-step demand in combination with the low-noise operation in a three-outdoor-unit system.
(2) Contact input and control content
1) 2-step demand control
The same control as the Thermo-OFF is performed by closing 1-3 pin of CN3D.
CN3D
1-3P
Open
Close
2) 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
HWE10130
DipSW4-4
OC
OFF
ON
OFF
OFF
ON
ON
OFF
ON
x = 100%
x = 0%
1-2P
Open
x = 100%
x = 0%
Input to CN3D *2
OS1 OS2
OFF OFF OC
OFF OFF OC
ON OFF OS1
OFF ON OS2
ON OFF OC and OS1
OFF ON OC and OS2
ON ON OS1 and OS2
ON ON OC, OS1, and OS2
Close
x = 75%
x = 50%
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