Nibe F1126 User manual

Service manual
LEK
NIBE F1126
Ground source heat pump
SEM EN 1737-1
431583

Table of Contents
41 Important information
4Document information
4Safety information
52 The heat pump design
5The heat pump design
93 System description
9Principle of operation
11System diagram
134 Cooling circuit
13Outline diagram
13Compressor control
14Expansion valve
155 Component description
15Compressor (GQ10)
16Other components
21Sensors
21Electronics
236 Troubleshooting
23Alarm list
28Troubleshooting guide
36Function check, relays/components
377 Component replacement
37Basic
40Main components
50Circuit board and electronics
53Temperature sensor
548 Technical specifications
54Dimensions and setting-out coordinates
553x400 V
56Miscellaneous
56
Working range heat pump, compressor opera-
tion
57Item register
3Table of Contents |NIBE F1126

Document information
This technical manual is a complement to the Installer
handbook for F1126, containing:
■Description of functions and component description.
■Information to facilitate fault-tracing.
■Instructions for replacing components.
■Wiring diagram.
■Supplementary technical information.
The document applies to heat pumps with software
version 7994R2.
The heat pump software version can be found in the info
menu (menu 3.1).
Safety information
This manual describes installation and service procedures
for implementation by specialists.
Symbols
NOTE
This symbol indicates danger to person or ma-
chine .
Caution
This symbol indicates important information
about what you should observe when maintain-
ing your installation.
TIP
This symbol indicates tips on how to facilitate
using the product.
Marking
The CE mark is obligatory for most products sold
in the EU, regardless of where they are made.
CE
Classification of enclosure of electro-technical
equipment.
IP21
Danger to person or machine.
!
Read the User Manual.
Serial number
The serial number can be found at the bottom right of
the front cover and in the info menu (menu 3.1).
Caution
You need the product's (14 digit) serial number
for servicing and support.
NIBE F1126Chapter 1 | Important information4
1 Important information

The heat pump design
General
F1145
PF1
QN10
BT2
EB1
UB1
QM34
QM31
XL1
XL6
XL9
XL7
XL2
UB3
AA4
W130
SF1
AA4-XJ4
AA4-XJ3
UB2
QM32
QM33
PF2
Pipe connections
Connection, heating medium flowXL1
Connection, heating medium returnXL2
Connection, brine inXL6
Connection, brine outXL7
Connection, hot water heaterXL9
HVAC components
Shut-off valve, heating medium flowQM31
Shut off valve, heating medium returnQM32
Shut off valve, brine outQM33
Shut-off valve, brine inQM34
Shuttle valve, climate system/water heaterQN10
Sensors etc.
Outdoor temperature sensor*BT1
Temperature sensors, heating medium flowBT2
* Not illustrated
Electrical components
Display unitAA4
AA4-XJ3 USB socket
AA4-XJ4 Service outlet (No function)
Immersion heaterEB1
SwitchSF1
Miscellaneous
Rating platePF1
Type plate, cooling sectionPF2
Cable gland, incoming electricityUB1
Cable glandUB2
Cable gland, rear side, sensorUB3
Designations in component locations according to
standard IEC 81346-1 and 81346-2.
5Chapter 2 | The heat pump designNIBE F1126
2 The heat pump design

Distribution boxes
FA1 FD1 AA2
AA1 X1
FB1
Electrical components
Immersion heater cardAA1
Base cardAA2
Miniature circuit-breakerFA1
Motor cut-out*FB1
Temperature limiter/Emergency mode thermostatFD1
Terminal blockX1
* 5 kW has auxiliary switch for motor cut-out.
Designations in component locations according to
standard IEC 81346-1 and 81346-2.
NIBE F1126Chapter 2 | The heat pump design6

3x400V 5 kW
FB1
X302 CA1
X301 QA30
3x400 V 6-12 kW
FB1 AA10
3x400 V 6-12 kW
FB1 AA10
3x230 V 6-10 kW
X302
AA10
FB1
BE4
X302 RF1
QA10
FB1
Electrical components
Soft-start cardAA10
CapacitorCA1
Motor cut-out*FB1
Soft-starterQA30
Terminal blockX301
Terminal blockX302
* 5 kW has auxiliary switch for motor protection breaker.
Designations in component locations according to
standard IEC 81346-1 and 81346-2.
Cooling section
5-8kW
UN
BT11
QM2
GP2
BT10
AA100
QM1
BT3
GP1
BT12
7Chapter 2 | The heat pump designNIBE F1126

12 kW
UN
BT12
GP2
GP1
BT3
QM1
BT10
BT11
QM2
5 kW
UN
EP2
BT14
BT17
BP2
BT15
BP1
EP1
GQ10
HS1
XL21
QN1
XL20
EB10
6 & 8 kW
UN
EP2
BT17
BT14
BP2
BT15
BP1
XL20
EP1
GQ10
HS1
XL21
QN1
EB10
12 kW
UN
EP2
BT14
BT17
BP2
BT15
BP1
EB10
EP1
GQ10
HS1
XL21
QN1
XL20
Pipe connections
Service connection, high pressureXL20
Service connection, low pressureXL21
HVAC components
Circulation pumpGP1
Brine pumpGP2
Drainage, climate systemQM1
Draining, brine sideQM2
Sensors etc.
High pressure pressostatBP1
Low pressure pressostatBP2
Temperature sensors, heating medium returnBT3
Temperature sensor, brine inBT10
Temperature sensor, brine outBT11
Temperature sensor, condenser supply lineBT12
Temperature sensor, hot gasBT14
Temperature sensor, fluid pipeBT15
Temperature sensor, suction gasBT17
Electrical components
Joint cardAA100
Compressor heaterEB10
Cooling components
EvaporatorEP1
CondenserEP2
CompressorGQ10
Drying filterHS1
Expansion valveQN1
Designations in component locations according to
standard IEC 81346-1 and 81346-2.
NIBE F1126Chapter 2 | The heat pump design8

Principle of operation
KBinVBf VBrVV KBut
XL1 XL6 XL9 XL7 XL2
BP2
BT3
BT12 BT10
BT17
BT15 BP1 BT11
BT14
EP1
EP2
GQ10
GP2
QM32
QM33
QW1
GP1
QM31
QM34
QN10
List of components
Pipe connections
Connection, heating medium flowXL 1
Connection, heating medium returnXL 2
Connection, brine inXL 6
Connection, brine outXL 7
Connection, hot water heaterXL 9
Cooling components
EvaporatorEP 1
CondenserEP 2
CompressorGQ 10
Expansion valveQN 1
HVAC components
Circulation pumpGP 1
Brine pumpGP 2
Shut-off valve, heating medium flowQM 31
Shut off valve, heating medium returnQM 32
Shut off valve, brine outQM 33
Shut-off valve, brine inQM 34
Shuttle valve, climate system/water heaterQN 10
9Chapter 3 | System descriptionNIBE F1126
3 System description

Sensors etc.
Internal
FunctionLocationName
Protects the compressor against pres-
sures that are too high.
On the liquid line.High pressure pressostatBP1
Protects the compressor against pres-
sures that are too low.
On suction gas line.Low pressure pressostatBP2
Set point values for heating and cool-
ing demand calculation. Operating
mode change.
Outdoor, shaded location on north side
of the house.
Outside sensorBT1*
Calculation of DM. If BT25 is installed,
only view.
On supply line after immersion heater
(EB1).
Flow pipeBT2
Stopping the compressor at high tem-
perature.
On return line between circulation
pump (GP1) and condenser (EP2).
Return pipeBT3
Stop and start of hot water charging.On water heater lower section.Hot water, chargingBT6*
Also used for display if BT7 is not in-
stalled.
View.At water heater peak.Hot water, topBT7*
View.On incoming brine line before circula-
tion pump (GP2).
Brine inBT10
Stops compressor at high temperature.
Controls brine pump speed together
with BT11
Stopping the compressor at low tem-
perature.
On outgoing brine line after evaporator
(EP1).
Brine outBT11
Controls brine pump speed together
with BT10
Stopping the compressor at high tem-
perature.
On supply line between condenser
(EP2) and immersion heater (EB1).
Condenser flow lineBT12
Stopping the compressor at high tem-
perature.
On hot gas line after compressor
(GQ10).
DischargeBT14
View.On the liquid line after the condenser
(EP2).
Fluid pipeBT15
View.On suction gas line before the com-
pressor (GQ10).
Suction gasBT17
Calculation of DM. If BT25 is connected.Externally on the flow line to the heat-
ing system.
External flow lineBT25*
Correction of the indoor temperature.In suitable indoor location.Room sensorBT50*
* Externally mounted (not included in outline diagram).
NIBE F1126Chapter 3 | System description10

System diagram
Heating
-QM31
-QM32
-FL3
-QM42
-QM12
-CM2
-HQ1
-QM34
-XL15
-BT1
-EB100
F11XX
-FL2
-CM1
-BT6
-CP1
-EP12
Function
The heat pump prioritises hot water charging. The circulation pump GP1 runs at a set speed.
TIP
More system principles are on www.nibe.eu.
Refer to the Installer manual for description of
possible docking alternatives.
11Chapter 3 | System descriptionNIBE F1126

Installation requirements
Heating medium side
11/12 kW8 kW6 kW
4BarMax system pressure
16512090lMin recommended volume heating system*
0.180.120.09l/sMin flow**
0.250.160.12l/sNominal flow
0.330.210.17l/sMax recommended flow
574753kPaMax external available pressure at nom flow***
See diagram page 56.°CMin/max temperature
* min volume refers to circulating flow
** overflow valve must be used if min flow cannot be guaranteed
*** external circulation pump must be used when the pressure drop in the system is greater than the available ex-
ternal pressure. In such cases, a bypass line with non-return valve must be installed.
Brine side
11/12 kW8 kW6 kW
3BarMax system pressure
0,430,300,22l/sMin flow
0,640,420,30l/sNominal flow
573949kPaMax external available pressure at nom flow
See diagram page 56.°CMax/min incoming temperature
-10°CMin outgoing temperature
NIBE F1126Chapter 3 | System description12

Outline diagram
Köld-
bärare
Bulb
LP
HP
Förångare
Kompressor
Högtrycks-
pressostat
Vätske-
ledningsgivare
Hetgasgivare
Lågtrycks-
pressostat
Exp.-
ventil
Tork-
filter
Kondensor
Värme-
bärare
Condenser
Evaporator
Brine Heating
medium
Exp. valve
Compressor
Drier
filter
Bulb
Hot gas sensor
High pressure pressostat
Fluid line sensor
Low pressure pressostat
Compressor control
High pressure pressostat
The compressor stops when the pressure is 32 bar, and
restarts automatically when the pressure is below 25
bar.
Stop with manual restart:
■The above has occurred 2 times within 150 minutes.
■More than 300 minutes have passed since the above
stop occurred.
Low pressure pressostat
Stop with manual restart:
■The compressor stops when the pressure is below 1.5
bar, and can restart when the pressure is above 3 bar.
The function is blocked for 1 minutes after switching
between charging type HW and heating.
Motor protection
Tripped motor protection is reset manually on the motor
protection breaker.
SettingF1126
4.0 A6 kW
6.0 A8 kW
9.0 A12 kW
If two phases are missing this is indicated as a motor
protection alarm.
Phase monitor
Stop with automatic restart:
■When a phase is below ~160V.
■Incorrect phase sequence.
Stop with manual restart:
■More than 30 minutes have passed since the above
events occurred.
Working area
See diagram page 56.
Time conditions
Minimum time between stop and start is 4 min.
Compressor heater
The compressor heater is active when relay (K4) on the
base card is in unaffected mode.
When the compressor is inactive the compressor heater
is always active.
13Chapter 4 | Cooling circuitNIBE F1126
4 Cooling circuit

Expansion valve
Check that overheating occurs by measuring the vapour
temperature with a manometer and the suction gas
temperature with a service thermometer. The suction
gas temperature is measured on the suction pipe at the
entrance to the compressor.
Overheating is shown in the table below and must be
checked when the temperature of the heating medium
flow is 30 - 55 °C and the brine in is -5 - +15 °C.
superheatF1126
4 - 6 °C6 kW
4 - 6 °C8 kW
4 - 6 °C12 kW
NIBE F1126Chapter 4 | Cooling circuit14

Compressor (GQ10)
3 x 400 V
Resistance range (Ω at 20 °C +/- 10 %)TypeSize (kW)
U-V[S-R]W-U[C-S]W-V[C-R]
5.195.195.19Piston6
3.563.563.56Piston8
3.643.643.64Scroll12
15Chapter 5 | Component descriptionNIBE F1126
5 Component description

Other components
DescriptionComponent
1x230 V and 3x400 VImmersion heater (EB1)
White coil (1/3 kW), internal resistance: 55 ohm
Brown coils (3 x 2 kW), internal resistance: 27 ohm
3x230 V
White coil (3 kW), internal resistance 18 ohm
Red coil (2 kW), internal resistance 27 ohm
Brown coil (2 kW), internal resistance 27 ohm
Black coil (2 kW), internal resistance 27 ohm
Actuator motor: 7 VA, 230/24 VAC, 50 Hz, IP 40. Running time approx 8 secondsReversing valve (QN10)
Max. operating pressure: 1.0 MPa
Operating temperature: 5 - 80 °C (90 °C briefly)
From September 2012
56 56 Ø28
30
54
142
Ø28
33
53,2
68,7
Before September 2012
56 56 Ø28
30
54
106
142
Ø28
NIBE F1126Chapter 5 | Component description16

DescriptionComponent
6 - 8 kWHeating medium pump
(GP1) Max lift height: 5.5 mMax flow: 4.0 m3/h
Max. output: 80 WMotor: 1x230 VAC, 50 Hz
180
Ø1½
102
Up until 14/12/2015
11 kW
Max lift height: 8.0 mMax flow: 7.0 m3/h
Max. output: 140 WMotor: 1x230 VAC, 50 Hz
180
Ø1½
168
17Chapter 5 | Component descriptionNIBE F1126

DescriptionComponent
6 - 12 kWHeating medium pump
(GP1) Max lift height: 7.5 mMax flow: 3.5 m3/h
Max. output: 80 WMotor: 1x230 VAC, 50 Hz
Control signal: PWM 0-10 V DC (max-min
speed)
180
26 110
48 85
Ø28
From 15/12/2015
NIBE F1126Chapter 5 | Component description18

DescriptionComponent
6 - 8 kWBrine pump (GP2)
Max lift height: 8.0 mMax flow: 7.0 m3/h
Max. output: 140 WMotor: 1x230 VAC, 50 Hz
180
Ø1½
168
Up until 11/11/2015
11 kW
Max lift height: 10.0 mMax flow: 11.0 m3/h
Max. output: 250 WMotor: 1x230 VAC, 50 Hz
180
Ø1½
196
19Chapter 5 | Component descriptionNIBE F1126

DescriptionComponent
6-8kW
Max flow: 5 m3/h
Max lift height: 8.5 m
Control signal: PWM 0-10 V DC (max-min speed)
94
138
19 132
61
800
106
143
180
G1 1/2
Brine pump (GP2)
From 12/11/2015
12 kW
UPM XL –Geo 25-125. Operating voltage 1*230 V, max 180 W
Control signal: PWM 0 - 10 V DC (max-min speed)
117
10438 50
180
G 1⁄ ’’
Breaking value: 29 barHigh pressure switch (BP1)
Reconnection differential: -7 bar
Breaking value: 1.5 barLow pressure switch (BP2)
Reconnection differential: 1.5 bar
Output (5-10): 30 WCompressor heater
Capacity (12): 40 W
NIBE F1126Chapter 5 | Component description20