Munters MX2G Owner's manual

Originalinstructions

Usermanual

MX²30–95G

Desiccantdehumidiﬁer

withgasheaterforreactivation

Appliestoallunitsmanufactured

fromweek01,2015.

190TEN–1090–G1412 ©MuntersEuropeAB2015

Importantuserinformation

Intendeduse

Munters dehumidiﬁers are intended to be used for the

dehumidiﬁcationofair.Anyotheruseoftheunit,or

use which is contrary to the instructions given in this

manual, can cause personal injury and damage to the unit

and other proper ty.

No modiﬁcation of the unit is allowed without prior

approvalby Munters. Attachment or installation

of additional devic es is only allowed after written

agreement by Munters.

Warranty

Thewarrantyp

eriodisvalidfromthedatetheunit

left our f acto

ry, unless otherw ise stated in writing.

Thewarranty

is limited to a free exchange of parts or

components w

hich have failed as a result of defects in

materials o

rworkmanship.

All war ranty claims must include proof that the

fault has occurred within the warranty period an d

that the u n it has been used in accordance with the

speciﬁcations. All claims must specify the unit type and

fabrication number. This infor mation is stamped on the

identiﬁcation plate, see section Marking.

It is a condition of the war ranty that the unit for the full

warranty period is serviced and maintained by a qualiﬁed

Munters engineer or Munter s approved engineer.

Access to speciﬁc and calibrated test equipmen t is

necessary. The service and maintenance must be

documented for the warranty to be valid.

Alway s contact Munters for ser vic e or repair. Operating

faults can o ccur if the unit is maintained insufﬁciently or

incorrectly.

Safety

Information about dangers are in this manual indicated

by the common hazard symbol:

WARNING!

Indicatesapossibledangerthatcanleadtopersonalinjury.

CAUTIO N!

Indicatesapossibledangerthatcanleadtodamagetothe

unitorotherproperty,orc auseenvironmentaldamage.

NOTE!

Highlightssupplementaryinformationforoptimal

useoftheunit.

ConformitywithDirectives

The dehumidiﬁer is in conformity with the essential

safety requirements of the Machinery Directive

2006/42/EC, and in conformity with the provisions

of the Ecodesign Directive (ErP) 2009/125/EC, the

Ecodesign Directive for electric motors 2005/32/EC

and of the EMC Directive 2014/30/EU. The

dehumidiﬁer is manufactured by an organization

certiﬁed according to ISO 9001 and ISO 14001.

Copyright

The contents of this manual can be changed without

prior notice.

NOTE!

Thismanualcontainsinformationwhichis

protectedbycopyrightlaws. Itisnotallowedtoreproduceor

transmitanypartofthismanualwithoutwrittenconsentfrom

Munters.

Please send any co mments regarding this manual to:

Munters Euro pe AB

Technical Documentation

P.O. Box 1150

SE- 164 26 KISTA Sweden

e-mail: t-doc@munters.se

ii

Importantuserinformation

190TE N–1090–G141 2

Tableofcontents

Importantuserinformation ............... ii

Intendeduse ...........................

ii

Warranty ...............................

ii

Safety ..................................

ii

ConformitywithDirectives ............

ii

Copyright ..............................

ii

Tableofcontents ........................... iii

1 Introduction ................................. 1

1.1 General ................................

1

1.2 Aboutthismanual .....................

1

1.3 Safetyandcautions ...................

1

1.3.1 Safetylabels ...................

2

1.4 Operationmonitoring .................

2

1.5 Applicationlimitations .................

3

1.6 Faultindications .......................

3

1.7 Marking ................................

4

1.7.1 Identiﬁcationplate .............

4

1.7.2 Gasburnerdata ................

4

1.7.3 Pressuretestpoints ...........

5

2 Dehumidiﬁerdesign ....................... 6

2.1 Productdescription ...................

6

2.2 Principleofoperation ..................

6

2.3 Maincomponents,MX²30 ............

8

2.4 Maincomponents,MX²35–95 .......

10

2.5 Gasburnerunit ........................

12

2.6 GasMultiBloc

®

controlunit ............

13

2.6.1 Principleofoperation ..........

13

2.6.2 Overview .......................

14

2.6.3 Lowpressureswitch ...........

14

2.7 Gascontrolvalveunit .................

15

2.8 Burnersafetycontrolunit .............

16

2.8.1 Operation–start-up

sequence .......................

16

2.8.2 Programmeindicator ..........

17

2.8.3 Flamedetection ................

18

2.8.4 Shutdown/Lockout ............

18

2.9 Hightemperaturecut-out .............

19

2.10 Conﬁgurationfeatures ................

20

2.10.1Insulatedprocessairinlet .....

20

2.10.2Processfancontrol ............

20

2.10.3Bypassdamper ................

21

2.10.4EnergyRecoveryPurgeand

EnergyEfﬁciencyPurge .......

22

2.10.5LowDewpointPurge ..........

23

3 Installation ................................... 24

3.1 Safety ..................................

24

3.2 Movingthedehumidiﬁer ..............

24

3.3 Inspectionofdelivery ..................

24

3.4 Storingthedehumidiﬁer ..............

25

3.5 Siterequirements .....................

25

3.6 Foundation ............................

26

3.7 Ductinstallation .......................

27

3.7.1 Generalrecommendations ...

27

3.7.2 Ductforoutdoorairinlet .......

28

3.7.3 Ductforwetairoutlet ...........

28

3.7.4 Ductconnectiondimensions,

airinlets ........................ 29

3.7.6 Ductconnectiondimensions

(unitwithoutprocessfan) ......

30

3.7.7 Ductconnectiondimensions,

processfan ....................

31

3.7.8 Ductconnectiondimensions,

reactivationfan ................ 32

3.8 Gasandairsupply .....................

33

3.9 Electricalconnections ................

34

3.10 Externalhumiditytransmitter .........

34

4 Commissioning ............................. 35

4.1 Pre-startchecks .......................

35

4.2 Adjustmentofgasburner .............

35

4.3 Airﬂowadjustment ....................

37

4.3.1 General .........................

37

4.3.2 Settingtheratedairﬂows ......

38

4.3.3 Baseconﬁgurationsettings ...

39

4.4 Settingandtestingthegasburner ....

39

4.4.1 Settingmaximumeffect .......

39

4.4.2 Settingminimumeffect ........

41

5 Operation .................................... 42

5.1 Controlpanel ..........................

42

5.2 General ................................

43

5.3 Quickstop ..............................

43

190TEN–1090–G1412

Tableofcontents

iii

5.4 Operatingtheunit .....................

44

5.4.1 Initialstart-up,Manualmode

(MAN) ...........................

44

5.4.2 Initialstart-up,Automaticmode

(AUTO)–regulatingtoset

point ............................

44

6 Serviceandmaintenance ................. 45

6.1 Safety ..................................

45

6.2 Regularserviceandmaintenance ...

45

6.3 Serviceoptions ........................

46

6.4 Extendedwarranty ....................

46

6.5 Serviceindicatorlamp ................

46

6.6 Serviceandmaintenanceschedule

(0–24000hours) .......................

47

6.7 Serviceandmaintenanceschedule

(28000–48000hours) .................

48

6.8 Maintenanceofgasheaterunit .......

48

6.8.1 Maintenanceschedule ........

49

6.9 Airﬁlterreplacement ..................

50

7 Faulttracing ................................. 52

7.1 Safety ..................................

52

7.2 Faulttracinglist,dehumidiﬁer ........

53

7.3 Faulttracinglist,gasheaterunit ......

55

7.3.1 Measuringﬂamesignaland

differentialgaspressure .......

57

8 Technicalspeciﬁcation .................... 58

8.1 Capacitydiagrams ....................

58

8.2 Noisedata .............................

60

8.2.1 Noisetoroom ..................

60

8.2.2 Noiseinducts .................. 62

8.3 Dimensionsandservicespace ......

64

8.3.1 Dimensions ....................

64

8.3.2 Dimensions(unitwithout

processfan) ....................

65

8.3.3 Servicespace ..................

66

8.4 Technicaldata .........................

67

9 Scrapping .................................... 70

10 ContactMunters ............................ 71

iv

Tableofcontents

190TE N–1090–G141 2

1 Introduction

1.1 General

Munters manufactures a w ide range of e fﬁcient dehumidiﬁers designed for different uses and applications.

Contact your nearest Munters ofﬁce if you have any questions reg a rding the installat ion or the use of your

dehumidiﬁer.

For product data, see section Technical speciﬁcation.

Reactivation using a gas heater means that natural g as or propane/LPG (option) is the source of energy

that is use d to reactivate the dehum idiﬁer's rotor. This technique is intended for use where nat ural gas or

propane/LPG is available as a n alternative to heating with electricity or steam.

1.2 Aboutthismanual

This manual contains necessary information for how to install and use the dehumidiﬁer in a safe and

efﬁcient way. Operation instructions for the control system can be f ound in a separate supplement, also

delivered with t he dehumidiﬁer.

NOTE!

Makesuretoreadallrelevantpartsofthismanualbeforeoperatingorperforminganyworkonthe

dehumidiﬁer. Thismanualshouldbestoredinapermanentlocationclosetothedehumidiﬁer.

1.3 Safetyandcautions

Every measure has been taken in the design and manufacture of the dehumidiﬁer to ensure that it meets the

safety requirements of the directives and standar ds listed in the EC Declaration of Conform ity.

The information in this manual shall in no way take precedence over individual responsibilities or local

regulations.

During operation and other work with a machine it is always the responsibility of the individual to consider:

■

The safety of all persons concerned.

■

The safety of the unit and other proper ty.

■

The protection of the environment.

The types of dangers that are indicated in this manual are described in section Important user information.

190TEN–109 0–G1412

Introduction

1

WARNING!

-Theunitmustnotbesplashedwithorimmersedinwater.

-Theunitmustneverbeconnectedtoavoltageorfrequencyotherthanthatforwhichitwasdesigned. Refertothe

identiﬁcationplate. Linevoltagethatistoohighcancauseanelectricalshockhazardanddamagetotheunit.

-Donotinsertﬁngersoranyotherobjectsintotheairvents.

-Allelectricalinstallationsmustbecarriedoutbyaqualiﬁedelectricianandinaccordancewithlocalregulations.

-Thedehumidiﬁercanrestartautomaticallyafterapowercut. Alwayssetandlockthemainpowerswitchinthe

OFFpositionbeforecarryingoutanyservicework.

-Useonlyapprovedliftin

gequipmenttopreventpersonalinjuryanddamagetotheequipment.

-AlwayscontactMuntersforserviceorrepair.

1.3.1 Safetylabels

The safety labels below are attached to the unit. Make sure that all personnel working with or near the unit

are aware of the meaning of each label.

Figure 1.1 Risk of p ersonal inju ry due to electric shock. Figure 1.2 R isk of personal injury due to hot surfaces.

1.4 Operationmonitoring

Thedehumidiﬁer is controlled and monitored from the control panel on the front of the unit, see section

5.1, Control panel. The HMI (Human M achine Interface) is used to display values and parameters, and t o

input settings and commands to the control system. The HMI is described in the separate supplem ent.

2

Introduction

190TEN–1090–G1412

1.5 Applicationlimitations

Thedehumidiﬁer conforms to the emission limits of residential, commercial and light-industrial

environments except for the emission limits for harmonics emission (EN 61000-3-12).

As the equipment exceeds the limits for harmonics it must not be used in residential, commercial or

light-industrial environment without taking proper steps regarding the power installation like supplying the

equipment from a dedicated transformer connected to t he high or medium voltage network.

Thedehumidiﬁer conforms to R

sce

33, see Table 1.1.

Harmonic, number Limit (%)

1)

Measured value (%)

18

0,32

3 4 0,24

4 10,7 4,00

5 2,67 0,05

6

7,2

2,09

7

2

0,05

9 1,6 0,02

10 3,1 0,56

11

1,33 0,01

12 2

0,54

PWHD

2)

22

3,1

1)

Measured values valid for R

sce

=33

2)

Partial Weighted Harmonic Distortion

Table 1.1

Thedehumi

diﬁer must only be used in industrial environments (class A) when the HMI is equipped w ith a

touch pa n

el. If the HMI is equipped with a text panel, the dehumidiﬁer can be used in all environments

since t he

text panel is approved according to class B.

Thedehumidiﬁer is intended for indoor installation only.

1.6 Faultindications

Any faults are indicated by the red light on the control panel. The cause of the alarm is indicated on the

display.

190TEN–109 0–G1412

Introduction

3

1.7 Marking

1.7.1 Identiﬁcationplate

MX² 35-95G

MX² 30G

Figur e 1.3 Position of id

entiﬁcation plate

1005 170XXX XXXXX

4,1 kW

Max

4,6 kW

Munters Europe AB

Isafjordsgatan 1

164 26 Kista, Sweden

M

GAS

Made in Sweden

Fabr. No.

Fabr. year 2010

3 ~ 400V 50 Hz

Type

IP33

MX² 55G

Figure 1.4 Identiﬁcatio

n plate, example

Explanation of "Fabr. N

o" on the identiﬁcation plat e:

10 Year of manufacture 170XXX Article number

05 Week of manufacture XXXXX Serial number

1.7.2 Gasburnerdata

AT-BE-DK-DE-ES-FI-FR-GB-GR-IE-IT-LU-NL-PT-SE

Qn:

Inlet pressure:

150 kW net.

B22-C12-C32

G20-G25

18-30 mbar

This unit must be installed in accordance with the rules in force.

Consult instructions before installation and use of this appliance.

Unit Gas Category:

Unit Categories:

Figure 1.6 Example of label for natural gas

MX² 30G

MX² 35-95G

Figure 1.5 Label position

AT-BE-DK-DE-ES-FI-FR-GB-GR-IE-IT-LU-NL-PT-SE

Qn:

Inlet pressure:

150 kW net.

B22-C12-C32

G31

18-30 mbar

This unit must be installed in accordance with the rules in force.

Consult instructions before installation and use of this appliance.

Unit Gas Category:

Unit Categories:

Figure 1 . 7 Example of label for pr opane (option)

4

Introduction

190TEN–1090–G1412

1.7.3 Pressuretestpoints

The built-in pressure t est points are used for measuring pressure drop across components during

basic installation work and inspection of the rotor condition. For airﬂow adjustment, refer to section

4.3, Airﬂow adjustment .

MX² 30G

MX² 35-95G

Figure 1.8 Label positi

on

TP1

TP2

TP3

TP4

Figure 1.9 Pressure tes

tpoints

TP1. Process air TP1–TP4. Differentialpressur

e, process air

TP2. Wet air TP2–TP3. Differential pressu

re, reactivation a ir

TP3. Reactivation air

TP4. Dr y air

190TEN–109 0–G1412

Introduction

5

2 Dehumidiﬁerdesign

2.1 Productdescription

The desiccant dehumidiﬁer has been designed to effectively dehumidify the air in environments requiring

low air humidity.

All functional components are enclosed in a corrosion resistant Aluzink

®

casing (standard) or stainless steel

casing (option) which makes installation and maintenance easy. The unit is constructed on a steel base frame

which allows the use of a fork-lift truck during transportation and installation.

The electrical control system complies with standard EN 60204-1. The electrical components are mounted

on bus bars. The dehumidiﬁer is manufactured according to E uropean standards and the established

requirements for CE-marking.

2.2 Principleofoperation

1

4

2

3

Figure 2.1 R otor principle

1. Process air

2. Dr y air

3. Reactivation air

4. Wet air

The desiccant rotor is the adsorption dehumidifying component in the unit. The rot or structure is

comprised of a large number of small air channels.

The desiccant rotor is made of a composite material that is highly effective in attracting and retaining water

vapour. T he rotor is divided in two zones. The airﬂow to be dehumidiﬁed, process air, passes through the

largest zone of the rotor and then leaves the rotor as dry air. Since the rotor rotates slowly, the incoming air

always meets a dry zone on the rotor, thus creating a continuous dehumidiﬁcation process.

Theairﬂow tha t is used to dry t he rotor, r e a c tivation air, is heated. The reactivation air passes through

the rotor in the opposite direction to the process air and leaves the rotor a s wet air (warm, moist air). This

principle enables t he dehumidiﬁer to work effectively, even at freezing temperatures.

6

Dehumidiﬁerdesign

190TEN–1090–G1412

A

4

A

3

A

2

A

1

A

5

A

6

A

7

Figur e 2.2 Airﬂow overview

1. Process air

2. Dry air

3. Reactivation air

4. We t air

5. Reactivation fan

6. Rotor

7. Process fan

The gas burner system used for reactivation is based on a burner operating on natural gas or propane/LPG

(option). The burner operates as a direct ﬁred system to heat outdoor air to the required reactivation air

temp erature.

190TEN–109 0–G1412

Dehumidiﬁerdesign

7

2.3 Maincomponents,MX²30

4

14

3

1

2

7

8

10

12

11

15

5

16

13

17

6

9

Figure 2.3 Exploded view

20

21

15

22

19

18

Figure 2.4 Front view

23

6

Figur e 2.5 Rear view

8

Dehumidiﬁerdesign

190TEN–1090–G1412

Item No.

Description

1.

Reactivation fan

2.

Filter, reactivation air

3. Filter, process air

4.

Gas bur ner unit

5.

Cooling fan with ﬁlter

6.

Gas train with GasMultiBloc control unit

7.

Filter, cooling fan

8.

Inspection glass

9. Connector, RJ45

10.

Main power switch

11. Pressure sensor

1)

12.

Process fan

13.

Rotor

14. Drive motor, rotor

15.

Electrical panel

16.

Control syste

mdisplay

17.

Control panel

18.

Burner safety control unit

19.

Pressure switch for reactivation air

20.

Filter guard

21.

Sensor, rotor stop

22.

Duct, bypass damper

1)

23.

Gas shut-off valve

*

Safety thermostat (HTCO)

1)

Option

* Item not illlustrated, see F igure 2.16 .

Table 2.1 Main components, MX² 30

190TEN–109 0–G1412

Dehumidiﬁerdesign

9

2.4 Maincomponents,MX²35–95

10

9

3

1

12

4

5

7

8

11

16

17

18

13

14

15

6

2

Figure 2.6 Exploded view

3

22

23

26

25

24

20

19

21

Figure 2.7 Front view

27

28

17

Figure 2.8 Rear view

10

Dehumidiﬁerdesign

190TEN–1090–G1412

Item No.

Description

1.

Control system display

2.

Control panel

3.

Process fan

4.

Duct, bypass damper

1)

5. Duct, p urge, right

1)

6.

Safety thermostat (HTCO)

7.

Electrical panel

8.

Drive motor, rotor

9.

Rotor cassette

10.

Duct, purge, left

1)

11.

Filter guard

12.

Plate, bypass

13. Filter, process air

14.

Reactivation fan (left)

2)

15. Reactivation fan

16.

Filter, reactivation air

17.

Gas train with GasMultiBloc control unit

18.

Gas burner unit

19.

Pressure switch for r eactivation air

20.

Burner safety control unit

21.

Electrical panel

22.

Connector, RJ45

23. Main power switch

24

Safety thermostat with reset button

25. Pressure sensor

1)

26. Sensor, rotor stop

27.

Inspection glass

28.

Gas shut-off valve

1)

Option

2)

Only used for reverse d assemblies

Table 2.2 Main c omponents, MX² 35–95

190TEN–109 0–G1412

Dehumidiﬁerdesign

11

2.5 Gasburnerunit

Direct ﬁred gas burners are used on all MX²-series dehumidiﬁers. T he burner operates on natural gas or

propane (option) and uses the reactivation air to supply the oxygen necessary for combustion. A correct

reactivation airﬂow is t h erefore essential to e n sure that the burner operates efﬁciently.

For optimal performance, the reactivation air must contain minimum 20 % oxygen. Bur ner return air cannot

be used. To maintain the efﬁciency of the unit, it is also important that the outlet for t he wet air is correctly

placed. This is to prevent the wet air contaminating the reactivation air.

The burner is mounted in the reactivation airﬂow. The gas is mixed with the reactivation air wh ich penetrates

into the space between the V-shaped mixing plates.

A spark ignitor and ﬂame detection probe are mounted in the burner combustion chamber. The ﬂame

detection probe uses the ionisation principle to send a ﬂame signal to the burner safety control unit.

The working principle w ith constant airﬂow and pressure drop across the bur ner ensures that the

combustion gase s and reactivation air mix well.

4

2

1

6

3

5

Figure 2.9 Gas burner assembly

1. Mixing plates

2. End p lates

3. Flame detection probe

4. Ignition transformer

5. Spark ignitor

6. Burner head

12

Dehumidiﬁerdesign

190TEN–1090–G1412

6

8

2

4

5

3

7

1

Figure 2.10 Side view of the b urner combu stion chamber

1. Burner head port

2. Flame detection probe

3. Mixing plates

4. Spark ignitor

5. Spark ignitor connection plug

6. Gas pipe

7. Flame detection connection plug

8. Silicone cable

2.6 GasMultiBloc

®

contr

olunit

2.6.1 Principleofoperation

A GasMultiBloc control unit in the gas train controls and m onitors the gas pressure and ﬂow. The

GasMultiBloc contains an adjustable ﬂow regulator which in conjunction with an exter nal control valve

enables automatic modulation of the burner capacity, see Figure 2.12 .

L1

N

3

4

V1

V2

5

1

2

N

L1

Figure 2.11 Diagram, GasMultiBloc

3.

Gas ﬁlter

N.

Neutral

4.

Low pressure switch

V1.

Solenoid valve

5.

Gas pres

sure regulator

V2.

Solenoid valve (including adjustable ﬂow regulator)

L1.

Phase

Theg asﬂows into the GasMultiBloc, passes through the gas ﬁlter (3) and the adjustable low pressure switch

(4). Valves V1 and V2 are energised by the same control signal and open simultaneously. The pressure is

set by the pressure regulator (5). The maximum allowed gasﬂow (max. bur ner capacity) is restricted by

the adjustable ﬂow regulator included in valve V2.

190TEN–109 0–G1412

Dehumidiﬁerdesign

13

2.6.2 Overview

1

8

5

2

3

4

6

7

9

A

B

Figur e 2.12 Overview, GasMultiBloc

A.

Flow from gas supply

B.

Flow to gas burner

1.

Gas shut-off valve

6.

Cove r for gas ﬁlter

2.

Low pressure switch

7.

Screw for cover

3.

Pressure test point for gas supply (P

e

)

8.

Pressure test point (before

valve V1)

4.

Maximum ﬂow adjustment knob

9. Gas control valve with

actuator

5.

Pressure test point (after valve V1)

2.6.3 Lowpressureswitch

The low pressure switch is connected to the inlet pipe on the GasMultiBloc control unit. If the gas pressure

is too low, the electrical supply to the control unit is disrupted. T he dehumidiﬁer is then switched off

automatically, and an alarm for low gas pressure is shown on the control panel display. T he low pressure

switch has a range of 5 to 150 mbar. Standard setting is 15 mbar.

Made in Germany

IP 54

5

90

10

20

30

50

70

110

130

mbar

GW 50 A5

pmax.= 500 mbar Gas

~(AC) 50-60Hz 10A 250V

15T70

ID.No:CE-0085

AO 0012

150

Figur e 2.13 Low pressu re switch

14

Dehumidiﬁerdesign

190TEN–1090–G1412

2.7 Gascontrolvalveunit

In this m o dulating gas reactiva tion heater system , there is a c ontrol va lve ﬁtted in the g as line between the

GasMultiBloc and the gas burner. This makes it possible to vary the g a s ﬂow and burner capacity during

operation. The control valve is connected to an electric actuator that is controlled by the program unit using

a0–10VDCsignal.

0

1

0

A

B

C

D

A.

Rotating valve extension

C.

Override button

B.

Minimum capacity screw D.

Inverse contro

lactionswitch

190TEN–109 0–G1412

Dehumidiﬁerdesign

15

2.8 Burnersafetycontrolunit

The control unit ensures safe ignition, start -up and shut-dow n during both nor mal operation and if a fault

occurs.

It is equipped with a self-checking ﬂame monitoring circuit that controls t he combustion process. T he ﬂame

monitoring circuit applies the necessary safety measures if the ﬂame signal occurs to soon or not at all, and if

any type of fault in the ﬂame detector, detector cables or ﬂame signal ampliﬁer occurs.

Faults that are detected during the start-up procedure or normal operation result in shutdown. Operation is

then preven ted u ntil the fault is remedied and the bur ner safety control unit is reset using the mode switch.

1

2

Figure 2.14 Bur n er con

tr ol unit

1. Prog ramme indicator

2. Warning lamp for shut

down/lockout switch

See the wiring diagram for more inform ation on the control unit connections.

2.8.1 Operation–start-upsequence

When power is applied to the relay and the start contact is closed, the burner control unit runs to ‘start’

position. When the burner control unit receives a star t ing signal from the PLC, an automatic check is carried

out between the burner control unit a nd the pressure switch for the reactivation airﬂow. This is to ensure

that the pressure sw itch contact is open. If the contact is open, the reactivation air fan can star t .

■

If the pressure switch contact is closed (in the 'no air' position), the control unit does not star t.

Shortly after the reactivat ion air f an starts, the bur ner control unit checks that the pressure switch contact has

closed (combustion air supply available).

■

If the contact has not closed, the contr ol unit abor ts the burner start up .

When the ﬂow sw itch contact is closed, the purge time start. For about 30 seconds, all remaining gasses are

purged from the c ombustion chamber. After the purge time has been terminated, the ignition is started.

A few seconds later the g as supply valves (V1 and V2) are supplied with power. In case a ﬂame has been

established and detected by the ﬂame detection probe, the relay continues to operate until it has reached its

r un position. If no ﬂame is present or not detected, the relay generates a burner lock out, closing (V1 and

V2) immediately. The program indicator s tops in the position where the problem occur red as help for fault

tracing.

16

Dehumidiﬁerdesign

190TEN–1090–G1412

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Munters MX2G Owner's manual

Munters MX2G Owner's manual

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