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Conrm the type of outdoor machine and the number of inside machine
• After installation, please conrm that the outdoor computer board BM1_1 is in the 0 state and then check the digital
display. If the number of indoor units, the outdoor unit type and the power supply voltage is correct, change the BM1_1
dial to the 1 state. If it is not correct, please check the dial machine communication code and models, do not force the
BM1_1 dial to the 1 state, it may cause system failure.
Trial operation and the performance
5-minute delay function
• If starting up the unit after being powered off, the compressor will run about 5 minutes later against being damaged.
Cooling/heating operation
• Indoor units can be controlled individually, but cannot run in cool and heat mode at the same time. If cool mode and the
heat mode set at the same time, the unit set last will be set to standby, and the unit set rst will run normally. If the A/C
manager sets the unit to allow only cooling or only heating mode, the unit can not run at the other modes.
Heating mode characteristic
• While operating, if the outdoor temp. rises, the indoor fan motor will run at a low speed or stop.
The unit operation condition
• Please only operate the unit under the specied temperature range. If operating outside of the range, protection modes
will cause the unit to stop operating.
• The relative humidity should be lower than 80%. If the unit runs while the humidity is over 80% for a long period, the
dew on the unit will drop down and vapor will be blown from air outlet.
Protection device (such as high pressure switch)
• The unit has a high pressure switch which can stop system operation to protect the unit from damage. When the high
pressure switch activates, cooling/heating mode will stop but the running LED on the wired controller will still be lit. The
wired controller will also display an error code. The high pressure switch can be triggered by the following:
In cooling mode, air outlet and air inlet of the outdoor unit are clogged.
In heating mode, the indoor lter is full of dust; indoor air outlet is clogged.
When the protection mode goes off, please turn off the power and re-start the unit after eliminating the problem.
Defrosting in heating mode
• In heating mode, defrosting will affect the heating efciency. The unit will defrost for about 2~10 minutes automatically.
During defrost, any frost will melt and condensate will ow from outdoor unit. While defrosting vapor will appear at the
outdoor unit, which is normal. The indoor motor will run at low speed or stop, and the outdoor motor will stop.
When power failure
• When there is a power failure while the unit is running, all the operations will stop.
• After being powered again, if the re-start up function is enabled, the unit can resume to the last state before losing
power; if the re-satrt up function is disabled, the unit needs to be switched on again manually.
• When abnormal operation occurs while running because of the storms, radio interference, etc, please turn off the power
source. After eliminating the interference, press the "ON/OFF" button to start up the unit again.
Heating capacity
• A heat pump in heating mode absorbs the outdoor heat energy and releases it indoor. As the outdoor temperature goes
down, the heating capacity will decrease.
System marks
• When multiple MRVII-S systems are installed, to identify the matching outdoor and indoor, please label on the outdoor
electric control box cover to indicate the connected indoor unit as shown in the below gure:
Indoor model:
Room No.
e.g. Indoor A, system 1, Floor 2 2F-1A
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