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119344-01B

15

6. 

Thermostat  Models:

  Turn  control  knob 

counterclockwise 

  to  the  PILOT 

position. Press in control knob for five (5) 
seconds.

 

Manual Models:

 Press in and turn control 

knob counterclockwise 

 to the PI

-

LOT position. Keep control knob pressed 
in for five (5) seconds.

7.  With control knob pressed in, push down 

and  release  ignitor  button. This  will  light 
pilot. The pilot is attached to the front of 
burner. 

Note:

  You  may  be  running  this 

heater for the first time after hooking up to 
gas supply. If so, you may need to press in 
control knob for 30 seconds or more. This 
will allow air to bleed from the gas system. 
If needed, keep pressing ignitor button until 
pilot lights. If ignitor does not light pilot, re

-

fer to 

Troubleshooting

, page 19 or contact a 

qualified service person or gas supplier for 
repairs. Until repairs are made, light pilot 
with match. To light pilot with match, see 

Manual Lighting Procedure

, page 16.

8.  Keep control knob pressed in for 30 sec

-

onds after lighting pilot. After 30 seconds, 
release control knob.
• If  control  knob  does  not  pop  up  when 

released,  contact  a  qualified  service 
person or gas supplier for repairs.

 

Note:

 If pilot goes out, repeat steps 4 thru 

7. Thermostat models have a safety inter

-

lock system. Wait one (1) minute before 
lighting pilot again.

9.  Turn control knob counterclockwise 

 

to desired heating level. The main burner 
should  light.  Manual  control  heaters 
should be used in locked positions.

oPeRATING HeATeR

FOR YOUR SAFETY READ 

BEFORE LIGHTING

 WARNING: If you do not fol-

low  these  instructions  exactly, 

a  fire  or  explosion  may  result 

causing property damage, per

-

sonal injury or loss of life.

A.  This appliance has a pilot which must 

be lighted by hand. When lighting the pi

-

lot, follow these instructions exactly.

B.  BEFORE  LIGHTING  smell  all  around 

the appliance area for gas. Be sure to 
smell next to the floor because some 
gas is heavier than air and will settle 
on the floor.

 

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electric switch; do 

not use any phone in your building.

• Immediately  call  your  gas  supplier 

from a neighbor’s phone. Follow the 
gas supplier’s instructions.

• If you cannot reach your gas supplier, 

call the fire department.

C.  Use only your hand to push in or turn 

the gas control knob. Never use tools. 
If the knob will not push in or turn by 
hand, don’t try to repair it, call a qualified 
service technician. Force or attempted 
repair may result in a fire or explosion.

D.  Do  not  use  this  appliance  if  any  part 

has been under water. Immediately call 
a qualified service technician to inspect 
the appliance and to replace any part of 
the control system and any gas control 
which has been under water.

LIGHTING 

INSTRUCTIONS

1.  STOP! Read the safety information above.
2.  Make sure equipment shutoff valve is fully 

open.

3.  Turn off any electric power to the appli

-

ance if service is to be performed.

4.  Turn control knob clockwise 

 to the 

OFF position.

5.  Wait  five  minutes  to  clear  out  any  gas. 

Then  smell  for  gas,  including  near  the 
floor. If you smell gas, STOP! Follow “B” in 
the safety information above. If you don’t 
smell gas, go to the next step.

Figure 19 - Control Knob In The OFF 

Position Manual Control Models

Ignitor Button

Control Knob

OF

F  

  P

ILO

Figure 20 - Control Knob In The OFF 

Position Thermostat Models

Ignitor Button

Control Knob

Summary of Contents for WMN20A

Page 1: ...her flammable vapors and liquids in the vicinity of this or any other appliance WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance Do not touch any electrical switch do not use any phone in...

Page 2: ...er or birth defects or other reproductive harm IMPORTANT Read this owner s manualcarefullyandcompletely before trying to assemble operate or service this heater Improper use of this heater can cause s...

Page 3: ...th other gases 2 Do not place propane LP supply tank s inside any structure Locate propane LP supply tank s outdoors 3 This heater shall not be installed in a bedroom or bathroom 4 If you smell gas sh...

Page 4: ...f the unit Vent free gas products are prohibited for bedroom and bathroom installation in the Commonwealth of Massachusetts Unpacking 1 Remove heater from carton 2 Remove all protective packaging appl...

Page 5: ...The air that leaks around doors and windows may provide enough fresh air for combustion and ventilation However in buildings of un usually tight construction you must provide additional fresh air Unus...

Page 6: ...ppliances Direct vent draws combustion air from the outdoors and vents to the outdoors Example Gas water heater _ ____________ Btu Hr Vent free heater _ ___________ Btu Hr Total _ ___________ Btu Hr 4...

Page 7: ...lheatingsystem youmay run system s circulating blower whileusingheater Thiswillhelp circulatetheheatthroughoutthe house In the event of a power outage you can use this heater as your primary heat sour...

Page 8: ...affic areas in windy or drafty areas Figure 4 Mounting Clearances As Viewed From Front of Heater INSTALLATION Continued CAUTION This heater cre ates warm air currents These currents move heat to wall...

Page 9: ...of front panel forward then out 3 Remove any remaining packaging ma terials Methods For Attaching Mounting Bracket To Wall Only use last hole on each end of mounting bracket to attach bracket to wall...

Page 10: ...cm 5 6 cm 18 3 4 47 6 cm Min 18 3 4 47 6 cm Min Figure 10 Popping Open Anchor Wings For Thin Walls Mounting Bracket attached to wall Horizontal Slots Attaching To Wall Anchor Method For attaching moun...

Page 11: ...lace front panel at this time Replace front panel after making gas connections and checking for leaks see pages 12 through 14 INSTALLATION Continued Mounting heater to floor With optional floor kit Mo...

Page 12: ...ure 14 External Regulator With Vent Pointing Down External Regulator Propane LP Supply Tank Vent Pointing Down CAUTION Use only new black iron or steel pipe Inter nally tinned copper tubing may be use...

Page 13: ...ernal regula tor has been installed between propane LP supply and heater See guidelines under Connect ing to Gas Supply page 12 Pressure Testing Gas Supply Piping System Test Pressures In Excess Of 1...

Page 14: ...tank valve 3 Make sure control knob of heater is in the OFF position 4 Check all joints from equipment shutoff valve to thermostat gas valve see Figure 17 or 18 Apply a noncorrosive leak de tection f...

Page 15: ...losion may result causing property damage per sonal injury or loss of life A This appliance has a pilot which must be lighted by hand When lighting the pi lot follow these instructions exactly B BEFOR...

Page 16: ...temperatures etc Frequent use of your heater will let you determine your own comfort levels MANUAL LIGHTING PROCEDURE 1 Remove front panel see Figure 7 page 9 2 Follow steps 1 through 7 under Lighting...

Page 17: ...eck pilot flame pattern and burner flame pattern often PILOT FLAME PATTERN Figure 22 shows a correct pilot flame pattern Figure 23 shows an incorrect pilot flame pat tern The incorrect pilot flame is...

Page 18: ...ommend that you keep the burner tube and pilot assembly clean and free of dust and dirt To clean these parts we recommend using compressed air no greater than 30 PSI Your local computer store hardware...

Page 19: ...position 4 Air in gas lines when in stalled 5 Depleted gas supply pro pane LP gas only 6 ODS pilot is clogged 7 Gas regulator setting is not correct OBSERVED PROBLEM Whenignitorbuttonispressed there...

Page 20: ...ane LP gas company 1 Contact local natural or propane LP gas company 2 Clean burner see Cleaning and Maintenance page 18 or replace burner orifice 1 Clean burner see Cleaning and Maintenance page 18 o...

Page 21: ...s from furniture polish wax carpet cleaners etc may turn into white powder residue 1 Metal expanding while heat ing or contracting while cooling REMEDY 1 Check burner for dirt and debris If found clea...

Page 22: ...partially clogged 1 Gas leak See Warning statement above 2 Control valve defective 1 Foreign matter between control valve and burner 2 Gas leak See Warning statement above 1 Not enough combustion vent...

Page 23: ...ced under warranty Parts Under Warranty Contact authorized dealers of this product If they can t supply original replacement part s call DESA Heating Products Technical Ser vice Department at 1 866 67...

Page 24: ...119344 01B 24 4 20 4 17 18 19 2 3 5 6 8 16 9 10 11 12 13 14 18 Manual Control Models Only Thermostat Models Only 19 7 1 21 22 15 9 Illustrated Parts Breakdown Models WMN20A WMP20A GWN20TA GWP20TA GWN...

Page 25: ...bly 1 107894 15 Deflector Assembly 1 9 098271 09 Ignitor Cable 1 10 098249 01 Nut 2 11 110803 01 ODS Pilot Assembly 1 110803 02 ODS Pilot Assembly 1 12 103446 02 Burner 1 103447 06 Burner 1 13 099387...

Page 26: ...GA5010 For all models Equipment shutoff valve with 1 8 NPT tap FAN KITS PP100 For all models Provides better heat distri bution Makes heater more efficient Com plete installation and operating instru...

Page 27: ...1 0505 1 800 446 1446 www nbmc com Parts Centrals These Parts Centrals are privately owned businesses They have agreed to support our customer s needs by providing original replacement parts and acces...

Page 28: ...Heating Products who will provide original factory replacement parts Failure to use original factory replacement parts voids this warranty The heater MUST be installed by a qualified installer in acc...

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