Various Control Methods Using The Signal Input/Output Connector On Outdoor Unit - Mitsubishi Electric PUHY-HP72 Service Handbook

[2-4 M-NET Address Settings ]
2-4-7 Various Control Methods Using the Signal Input/Output Connector on Outdoor
Unit
(1) Various connection options
Type
Input Prohibiting cooling/heating operation (thermo OFF) by an external
input to the outdoor unit.
*It can be used as the DEMAND control device for each system.
Performs a low level noise operation of the outdoor unit by an ex-
ternal input to the outdoor unit.
* It can be used as the silent operation device for each refrigerant
system.
Forces the outdoor unit to perform a fan operation by receiving sig-
nals from the snow sensor.
Cooling/heating operation can be changed by an external input to
the outdoor unit.
The operation mode of the unit can be changed from normal cool-
ing operation (performance priority) to energy-saving cooling mode
by an external signal input.
Out- How to extract signals from the outdoor unit
put *It can be used as an operation status display device.
*It can be used for an interlock operation with external devices.
*1 For details, refer to section (2) Example of wiring connection.
*2 For details, refer to section (2) Example of wiring connection and other relevant sections in the manual. [2-5 Demand Control
Overview]
*3 Low-noise mode is valid when Dip SW6-8 on the outdoor unit is set to OFF. When DIP SW6-8 is set to ON, 4 levels of on-
DEMAND are possible, using different configurations of low-noise mode input and DEMAND input settings.When 2 or more
outdoor units exist in one refrigerant circuit system, 8 levels of on-DEMAND are possible. When 3 outdoor units exist in one
refrigerant circuitsystem, 12 levels of on-DEMAND are possible.
*4 By setting Dip SW6-7, the Low-noise mode can be switched between the Capacity priority mode and the Low-noise priority
mode.
When SW6-7 is set to ON: The Low-noise mode always remains effective.
When SW6-7 is set to OFF: The Low-noise mode is cancelled when certain outside temperature or pressure criteria are met,
and the unit goes into normal operation (capacity priority mode).
Low-noise mode is effective
Cooling
TH7 < 30°C [86°F]
and
2
63HS1 < 32kg/cm
*5 If multiple outdoor units are connected to the same refrigerant circuit, signal input/output settings need to be made for each
outdoor unit.
*6 Take out signals from the outdoor unit that is designated as OC if multiple outdoor units in the same system.
*7 If the formula TH7>5 holds true, the fan will not go into operation when the contact receives signal input.
*8 When using a base heater, change the setting using SW4. When using a base heater, error output will not be available.
(2) Example of wiring connection
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.
HWE18240_GB
Usage
*5*7
Heating
TH7 > 3°C [37°F]
and
2
63LS > 4.6kg/cm
Function
DEMAND (level)
Low-noise mode
*3*4
(level)
Snow sensor signal
input (level)
Auto-changeover
Energy-saving
mode
Operation status of
*5
the compressor
*6*8
Error status
Capacity priority mode becomes effective
Cooling
TH7 > 35°C [95°F]
or
2
63HS1 > 35kg/cm
Terminal
to be Option
*1
used
*2
CN3D Adapter for
external input
(PAC-
SC36NA-E)
CN3S
CN3N
CN3K
CN51 Adapter for
external out-
put
(PAC-
SC37SA-E)
Heating
TH7 < 0°C [32°F]
or
2
63LS < 3.9kg/cm
7
chapter 2 -