Nibe S735 - Maintenance Procedures; Checking System Pressure; Safety Valve Checks

Distribution boxes
-X29
-X28
1 0-5V 2 +5V
3 AUX1 4 AUX2 5 AUX3 6 AUX4 7 AUX5 8 AUX6 9 AUX7
10 AUX8 11 AUX9 12 BT25
1
1
2
3
2 3 4 5 6 7 8 9
10
11
12
GND
+12V
B
A
OT+ OT−
0-5V
PWM0 PWM1
CPU
EXT COM
INT COM
ERROR
POWER
+5V
GND
BE1 BE2 BE3
K10
-X27
NO
O
NC
AUX-RELAY
13 BT50 14 BT1
-X30
FQ10
AA2
RF2 FQ10-S2
ELECTRICAL COMPONENTS
Base cardAA2
Temperature limiterFQ10
FQ10-S2 Reset button for temperature limiter
EMC cardRF2
Air treatment section
BT21
BT3
QM24
GQ2
GQ10
BT14
QN1
BT17
BT20
HQ10
CA1
QA40
RA1
XL31
XL32
HZ2
BT15
BT12
EP2
EP1
AA3
AA30
FQ14
AA36
VENTILATION CONNECTIONS
Ventilation connection, exhaust airXL31
Ventilation connection, extract airXL32
HVAC COMPONENTS
Vent valve, heat exchangerQM24
SENSORS ETC.
Temperature sensors, heating medium returnBT3
Temperature sensor, heating medium flow after condens-
er
BT12
Temperature sensor, hot gasBT14
Temperature sensor, fluid pipeBT15
Temperature sensor, suction gasBT17
Temperature sensor, exhaust airBT20
Temperature sensor, extract airBT21
ELECTRICAL COMPONENTS
ZAB board
1
AA3
SFT board
1
AA30
Measurement board
1
AA36
CapacitorCA1
Temperature limiter, compressorFQ14
InverterQA40
ChokeRA1
1
Not visible in the image
COOLING COMPONENTS
EvaporatorEP1
CondenserEP2
CompressorGQ10
Drying filterHZ2
Expansion valveQN1
VENTILATION
Exhaust air fanGQ2
Exhaust air filter
1
HQ10
1
Not visible in the image
13Chapter 3 | The heat pump designNIBE S735