Vaillant V 10-025 NHI, Training Manual

Page: 38 / 56

Split Type Installation Manual
38
9 PCB Explanation
When defrosting exit conditions are met, the unit will
operate as follows
Compressor stops and external fan starts, 50s later,
four-way valve will be on, 60s later, compressor will
operate as per startup process.
9.2.5 PTC Output Control
When outdoor unit is energized, PTC output value is 0,
10s later, output value is 1.
When compressor stops for 10 minutes continuously,
PTC output value is 0.
On receiving compressor startup instruction, initial PTC
output is 1, and compressor startup will be performed 5s
later.
9.2.6 System Protection Function
3 minutes stand-by time
Time interval between compressor shutdown and restart
is set at 3 minutes to ensure that compressor will only
restart after 3-minute shutdown and initial energization
valves are turned on to adequate opening position after
being fully turned off.
TD High Temperature Protections
As long as unit is on, the TD air discharge overheat
protection feature will be activated, yet air discharge sensor
fault must be alarmed 4 minutes after compressor starts.
When TD>117 ºC for 20s continuously air discharge
overheat protection will be activated and fault will be
reported to indoor unit.
It will not continue in other conditions.
Indoor Heat Exchanger Anti-freeze Protection
When TC < 5 ºC compressor frequency will drop at a
speed of 1HZ/10s.
When TC starts to rise and 6
≤
TC
≤
7 ºC compressor
frequency will remain unchanged.
When 7 < TC < 11 ºC, frequency will rise at a speed of
1HZ/10s.
If TC
≤
0 ºC for 2 consecutive minutes, compressor will
shutdown and outdoor fault lamp blinks. Fault will not be
reported to indoor unit.
When compressor shuts down for more than3 minutes
and when TC>7 compressor will restart.
Outdoor Temperature Limit
Cooling:
When outdoor temperature is lower than 23 ºC,
cooling operation will start, compressor fre-
quency is limited to less than 50 HZ, outdoor
wind speed is forced at level 1.
Heating: When outdoor temperature is higher than 18 ºC,
heating operation will start, compressor frequency
is limited to less than 50 HZ, outdoor wind
speed is forced at level 1.
Special Features
1. Forced Cooling: When receiving indoor forced cooling
signal, cooling operation will start in a frequency sig-
naled by indoor unit. Only air discharge temperature
and over current protection features are effective
and other protection features are invalid.
2. Rated, Middle and Minimum Capacity Operation:
When receiving indoor, rated, middle and minimum
capacity operation signal, outdoor unit will operate
as per wind speed and frequency set by EEPROM and
all the protection features are effective.
Fault Display and Treatment
In case outdoor unit faults, the alarm indicator lamp will
blink and blink frequency is 1HZ Time interval between
blink cycles is 3s.
Alarm indicator lamp is off when there is no fault.