Demand Control; Contact Input And Control Content - Mitsubishi Electric PUHY-P200 Service Handbook
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Also See for PUHY-P200:
- Service handbook (334 pages) ,
- Service handbook (182 pages) ,
- Service handbook (40 pages)
Table of Contents
[ II Restrictions ]
3. 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
P200-P450YJM, EP200-EP300YJM models (single-outdoor-unit system): 2 and 4 steps shown in the rows (a) and (b) in
the table above only.
P500-P900YSJM, EP400-EP600YSJM models (two-outdoor-unit system OC+OS1): 2-8 steps shown in the rows (a), (b),
(c), and (e) in the table above only.
P950-P1250YSJM, EP650-EP900YSJM 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
HWE10040
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%
- 25 -
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