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

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.

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

BT11

QM2

GP2

BT10

AA100

QM1

BT3

GP1

BT12

7Chapter 2 | The heat pump designNIBE F1126

12 kW

BT12

GP2

GP1

BT3

QM1

BT10

BT11

QM2

5 kW

EP2

BT14

BT17

BP2

BT15

BP1

EP1

GQ10

HS1

XL21

QN1

XL20

EB10

6 & 8 kW

EP2

BT17

BT14

BP2

BT15

BP1

XL20

EP1

GQ10

HS1

XL21

QN1

EB10

12 kW

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

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