Mitsubishi Electric Y Series Manual page 176

OUTDOOR UNIT FUNCTIONS
176
Maintenance functions
Rotation control
Y-Series EP R2-Series
Y-Series P R2-Series
With the combination model, the outdoor/heat source units operate
alternately. This reduces operating load and leads to a longer service life.
Emergency operation mode
Y-Series EP R2-Series
Y-Series P R2-Series
With combination model, if one outdoor/heat source unit is
experiencing a problem, the other outdoor/heat source units
temporary perform emergency operation. This mode can be
easily set via remote controller.
Pump down function
Y-Series EP R2-Series
Y-Series P R2-Series
This function collects the refrigerant that remains in the indoor unit/BC controller (for VRF system), or the HBC controller
(for HVRF system) and the outdoor/heat source unit piping when the refrigerant piping needs to be removed, such as
when the air conditioner is relocated.
This function can also be used to stop the operation of the indoor unit and return the refrigerant to the outdoor/heat
source unit in the event that a refrigerant leak is detected.
* To detect a refrigerant leak, a circuit that includes a refrigerant leak detection sensor must be designed and prepared on site.
Individual LEV control
Y-Series EP R2-Series
Y-Series P R2-Series
Even if one of the indoor units stops for repair, the LEV of
the indoor unit can be closed so that the other indoor units
can continue to operate. (No preliminary setting is
necessary.)
Under
maintenance
Maintenance data retrieval via USB
Y-Series EP Y-Series
Operation data was retrieved from conventional models using the maintenance tool. On the latest model, the data can be
retrieved quickly via USB*
reducing field operation time and improving convenience. Software can be rewritten via USB*².
*1 In the case of OC-IC maximum configuration
*2 USB memory devices conforming to USB2.0 can be used.
EP WY-Series
P WR2-Series
EP WY-Series
P WR2-Series
EP WY-Series
P WR2-Series
EP WY-Series
P WR2-Series
Other indoor units
can work.
(Preliminary setting
is unnecessary.)
P R2-Series EP R2-Series P
. It is unnecessary to carry the personal computer in which the maintenance tool has been installed,
1
Alternate
operation
Malfunction
Emergency
operation is possible
Snow sensor setting
Y-Series EP Y-Series P R2-Series
When a snow buildup signal is received from the
snow sensor (procured locally), or when ambient
temperature drops below 5ºC (detected with TH7), the
outdoor unit is automatically switched to ventilation
operation. This activates the outdoor unit fan to
prevent snow from building up on the unit.
• Snow sensor setting example
Snow sensor (CN3S)
Relay circuit Adapter *2
X
Onsite
preparations
Maximum cable
length: 10m
X: Relay
Contact rating voltage >= 15VDC
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC
*2. Optional part: PAC-SC36NA-E or locally procured product
Snow sensor: The outdoor fan runs when X is closed in stop mode.
Rest assured in
case of unit failure
Emergency operation can
be performed easily with
a local remote controller.
EP R2-Series P
Outdoor unit
control board
CN3S
1
2
3