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MrHeater MHU200NG, Operating Instructions And Owner'S Manual

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MrHeater MHU200NG Operating Instructions And Owner'S Manual Download Page 27

Large Unit Heater

27

Operating Instructions and Owner’s Manual

PARTS LIST

SEE BACK PAGE FOR PARTS ORDERING INFORMATION

*NOT SHOWN

REF 

#

Description

200NG

250NG

300NG

400NG

1

HEAT EXCHANGER

60320

60321

60322

60323

2

UPPER SIDE PANEL

60324

60324

60324

60324

3

LATERAL SIDE PANEL 1

60325

60325

60326

60327

4

LOUVER

60328

60328

60328

60328

5

LATERAL SIDE PANEL 2

60329

60329

60330

60331

6

DOOR PANEL

60332

60332

60333

60334

7

BACK SIDE PANEL

60335

60336

60337

60338

8

BLOWER

60286

60286

60287

60287

9

WIRING CONNECTION BOX

N/A

N/A

N/A

N/A

10

THERMOSTAT TERMINAL

N/A

N/A

N/A

N/A

11

ANTI-VIBRATION SUPPORTS

N/A

N/A

N/A

N/A

12

STRAIN RELIEF

N/A

N/A

N/A

N/A

13

BURNER BOX

N/A

N/A

N/A

N/A

14

BURNERS SUPPORT BRACKET

N/A

N/A

N/A

N/A

15

INSHOT BURNER

60288

60288

60288

60288

16

ELECTRICAL COMPONENTS SUPPORT PANEL

N/A

N/A

N/A

N/A

17

IGNITER ELECTRODE

60289

60289

60289

60289

18

TRANSFORMER 120-24

60290

60290

60290

60290

19

PCB CONTROL BOARD

60291

60291

60291

60291

20

BLOWER DRIVE RELAY

60292

60292

60292

60292

21

PRESSURE SWITCH

60293

60294

60294

60294

22

DETECTION ELECTRODE

60295

60295

60295

60295

23

MANUAL RESET SAFETY THERMOSTAT (140

º

C)

60296

60296

60296

60296

24

AUTOMATIC SAFETY THERMOSTAT (NC 60

º

C)

60297

60297

60297

60297

25

BLOWER AUT. THERMOSTAT (NO 35

º

C)

60298

60298

60298

60298

26

ORIFICE NG

60299

60299

60300

60300

27

MANIFOLD

60301

60302

60303

60304

28

GAS VALVE 1/2” FLANGE

60305

60305

60305

60305

29

GAS VALVE

60306

60306

60306

60306

30

INLET 1/2” GAS PIPE CONNECTION

N/A

N/A

N/A

N/A

31

GAS PIPE PROTECTION

N/A

N/A

N/A

N/A

32

TURBOLATOR

N/A

N/A

N/A

N/A

33

TURBOLATOR ROD

N/A

N/A

N/A

N/A

34

ROD STOPPER

N/A

N/A

N/A

N/A

35

FLUE BOX GASKET

60307

60307

60308

60309

36

FLUE BOX

N/A

N/A

N/A

N/A

37

INDUCER GASKET

60310

60310

60310

60310

38

INDUCER

60311

60312

60312

60312

39

DOOR HINGE

60313

60313

60313

60313

40

LOUVER SPRING

60314

60314

60314

60314

41

CAPACITOR

60340

60340

60341

60341

*

ORIFICE LP

60315

60315

60316

60316

*

PRESSURE SWITCH SILICONE PIPE

60317

60317

60317

60317

*

ELECTRICAL WIRING

60318

60318

60318

60318

*

GAS VALVE CONNECTION

60319

60319

60319

60319

Summary of Contents for MHU200NG

Page 1: ...o this manual For assistance or additional information consult a qualified installer service agency or the gas supplier WHAT TO DO IF YOU SMELL GAS DO NOT try to light appliance DO NOT touch any elect...

Page 2: ...E INSTRUCTIONS BEFORE YOU OPERATE THIS HEATER WARNING FIRE OR EXPLOSION HAZARD Failure to follow safety warnings exactly could result in serious injury death or property damage Be sure to read and und...

Page 3: ...perly Set ________________________________ Furnace BTU input _____________________________________ Level ___________________________________________________ Line Pressure _____________________________...

Page 4: ...al Standard Institute Inc 11 West 42nd Street New York NY 10036 These units are CSA International design certified These unit heaters are certified for installation to combustible material as listed i...

Page 5: ...nual is to provide information regarding safety design guidelines installation operation and maintenance of the this gas fired unit heater You must read and understand the instructions and all safety...

Page 6: ...tion of these units must comply with the National Fuel Gas Code ANSI Z223 1 NFPA 54 latest edition and other applicable local building codes In Canada the installation of these units must comply with...

Page 7: ...ontal pitch as directed in these instructions and the latest edition of the National Fuel Gas Code ANSI Z223 1 NFPA 54 or CSA B149 1 Installation Code Determine that there is not blockage restriction...

Page 8: ...h a diameter 4 inches greater than the vent pipe diameter must be used If there is 6 feet or more of vent pipe prior to passing through the combustible wall or floor then the metal thimble need only b...

Page 9: ...than any part of a building within a horizontal distance of 10 3 05m unless otherwise specified by the American National Fuel Gas Code ANSI Z223 1 or Canada CAN CGA B149 Installation Code The vent mu...

Page 10: ...ombustion which can result in the production of excessive carbon monoxide Follow these guidelines and all applicable codes for all models prior to installing the combustion air duct work WARNING Suffi...

Page 11: ...drip leg should be installed in the vertical pipe run to the unit In some localities codes may require that a manual main shutoff valve and union furnished by installer be installed external to the un...

Page 12: ...putting into service For leak testing on pressures below 20 inches W C Before leak testing close the field installed manual shut off valve shown on Figure 9 on the supply line to isolate the gas valve...

Page 13: ...ssure Input Rating W C kPa BTU Hr W W C kPa BTU Hr W MHU200NG 7 23 1 8 200 000 58 614 6 66 1 66 192 000 56 269 MHU250NG 7 23 1 8 250 000 73 268 6 66 1 66 240 000 70 337 MHU300NG 3 81 0 95 300 000 87 9...

Page 14: ...the side access control compartment of the unit The low voltage thermostat and accessory control devices can be wired to the terminals in the side access control compartment Refer to the wiring diagra...

Page 15: ...Large Unit Heater 15 Operating Instructions and Owner s Manual Main Components FIGURE 10 Line Voltage Thermostat Wiring Connector on Heater S1 S4 M1 VG MC FS S2 S3 S2 CB SE T1 RFC CFC...

Page 16: ...Large Unit Heater 16 Operating Instructions and Owner s Manual Internal Wiring Diagram FIGURE 11...

Page 17: ...field supplied power wires so that they do not come in contact with the flue wrapper or venter housing These hot surfaces may damage the wire s insulation resulting in damage to the unit THERMOSTAT LO...

Page 18: ...puts set it to the maximum rating 7 Observe the pressure rating on the pressure gauge Verify maximum inlet gas supply pressure 8 Turn off all other gas appliances on the same supply line 9 Observe the...

Page 19: ...manifold pressure hose connector using a soap solution or equivalent method as described in ANSI Z223 1 NFPA 54 Prior to Leaving Job Site Prior to leaving the job site verify that Service access door...

Page 20: ...hts burner DO NOT attempt to light the burners manually 5 There is a main shut off valve upstream of the unit Open it See Figure 9 on Page 11 6 Wait five minutes to clear out any gas If you then smell...

Page 21: ...upply Follow lighting instructions to light unit Check burner flame FLUE PASSAGEWAY AND FLUE BOX The flue passages and flue box should be inspected and cleaned prior to each heating season The sequenc...

Page 22: ...old Screws FUEL CONVERSION INSTRUCTIONS FIGURE 15 Rotation of the Valve Manifold Assembly ROTATE valve manifold assembly The heater is standard manufactured for operation with natural gas In case of u...

Page 23: ...NOT FOLLOWED EXACTLY A FIRE EXPLOSION OR PRODUCTION OF CARBON MONOXIDE MAY RESULT CAUSING PROPERTY DAMAGE PERSONAL INJURY OR LOSS OF LIFE THE QUALIFIED SERVICE AGENCY PERFORMING THIS WORK ASSUMES RES...

Page 24: ...space tightly sealed building 1 Remove obstruction or correct vent lengths 2 Replace wiring or hose connections 3 Replace pressure switch The control board does not send spark to the electrode 1 The e...

Page 25: ...ontrol board does not send 120 VAC to the air movement fan after approx 30 seconds after ignition and if contact relay fan control is open and there isn t 24VAC on relay fan control 3 The control boar...

Page 26: ...er listed on the unit rating plate Mr Heater Large Unit Heater Model MHU200NG MHU250NG MHU300NG MHU400NG Liquid Propane to Natural Gas Conversion Kit MHU200NG F260165 MHU250NG F260166 MHU300NG F260167...

Page 27: ...60291 60291 60291 60291 20 BLOWER DRIVE RELAY 60292 60292 60292 60292 21 PRESSURE SWITCH 60293 60294 60294 60294 22 DETECTION ELECTRODE 60295 60295 60295 60295 23 MANUAL RESET SAFETY THERMOSTAT 140 C...

Page 28: ...001 Address any Warranty Claims to the Service Department Mr Heater Inc 4560 W 160TH ST CLEVELAND OHIO 44135 Include your name address and telephone number and include de tails concerning the claim Al...

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