Mitsubishi PUHY-P250YJM-A - Demand Control

[ II Restrictions ]
- 22 -
HWE1018A GB
CAUTION
1) Wiring should be covered by insulation tube with supplementary insulation.
2) Use relays or switches with IEC or equivalent standard.
3) The electric strength between accessible parts and control circuit should have 2750V or more.
Example of wiring connection
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 and
OS).
Between 2 and 8 steps of demand control is possible by setting DIP SW4-4 on the outdoor units (OC and OS).
*1. Available demand functions
P250YJM model (single-outdoor-unit system): 2 and 4 steps shown in the rows (a) and (b) in the table above only.
P500YSJM model (two-outdoor-unit system OC+OS): 2-8 steps shown in the rows (a), (b), (c), and (d) 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.
Table.1
No Demand control switch
DipSW4-4
Input to CN3D *2
OC OS
(a) 2 steps(0-100%) OFF OFF OC
(b) 4 steps(0-50-75-100%) ON OFF OC
(c) OFF ON OS
(d) 8 steps(0-25-38-50-63-75-88-100%) ON ON OC and OS
CN51
CN3S
CN51
X
Y
L
1
L 2
ecruos rewop pmaL
Distant control
board
Relay circuit Adapter
1
Outdoor unit
control board
Preparations
in the field
Maximum cable
length is 10m
5
4
3
X
Y
L1 : Outdoor unit error display lamp
L2 : Compressor operation lamp (compressor running state)
X, Y : Relay (coil =<0.9W : DC12V)
1. Optional part : PAC-SC37SA-E or field supply.
2. Optional part : PAC-SC36NA-E or field supply.
X : Relay
Snow sensor : The outdoor fan runs when X is closed
in stop mode or thermostat mode.
X
CN3S
Preparations
in the field
Maximum cable
length is 10m
Adapter
2
Outdoor unit
control board
2
3
1
Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC
Relay circuit
CN3D
2. Optional part : PAC-SC36NA-E or field supply.
X : Low-noise mode
X : Low-noise mode
Y : Compressor ON/OFF
X,Y : Relay
Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum appicable load =< 1mA at DC
Y
X
CN3D
Preparations
in the field
Maximum cable
length is 10m
Adapter
2
Outdoor unit
control board
3
2
1
Relay circuit
2. Optional part : PAC-SC36NA-E or field supply.
X
CN3D
Preparations
in the field
Maximum cable
length is 10m
Adapter
2
Outdoor unit
control board
2
3
1
X : Relay
fan frequency and maximum compressor frequency.
Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC
Low-noise mode : The noise level is reduced by controlling the maximum
Relay circuit