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Design Dynamics PFS VF-18N-MHD, Owner'S Manual, Page: 25 / 28

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Design Dynamics PFS VF-18N-MHD Owner'S Manual Download Page 25

www.desatech.com

116986-01F

25

Purchase these accessories from your local 
dealer. If they can not supply these accessories 
call DESA Heating, LLC at 1-866-672-6040 for 
information. You can also write to the address 
listed on the back page of this manual.

REPLACEMENT PARTS

FIREPLACE HOOD

Black - GA6050
Brass - GA6052
Antique Brass - GA6053
For all models.

 Helps deflect heat away from 

mantel or wall above fireplace. Fits openings 
28" to 48" wide.

Note: Use only original replacement parts. 
This will protect your warranty coverage for 
parts replaced under warranty.

PARTS UNDER WARRANTY

Contact authorized dealers of this product. If 
they can’t supply original replacement part(s), 
call DESA Heating, LLC at 1-866-672-6040.
When calling DESA Heating, LLC, have 
ready:
• your 

name

• your 

address

•  model and serial numbers of your heater
•  how heater was malfunctioning
• purchase 

date

Usually, we will ask you to return the part to 
the factory.

PARTS NOT UNDER WARRANTY

Contact authorized dealers of this product. If 
they can’t supply original replacement part(s), 
call DESA Heating, LLC at 1-866-672-6040 for 
referral information. A list of authorized dealers 
can be found by visiting 

www.desatech.com.

When calling DESA Heating, LLC, have 
ready:
•  model and serial numbers of your heater
•  the replacement part number

SERVICE HINTS

When Gas Pressure Is Too Low

•  pilot will not stay lit
•  burners will have delayed ignition
•  heater will not produce specified heat
•  propane/LP gas supply may be low
You may feel your gas pressure is too low. If 
so, contact your local propane/LP or natural 
gas supplier.

TECHNICAL SERVICE

You may have further questions about installa-
tion, operation, or troubleshooting. If so, con-
tact DESA Heating, LLC at 1-866-672-6040. 
When calling please have your model and 
serial numbers of your heater ready.
You can also visit DESA Heating, LLC’s web 
site at 

www.desatech.com

.

ACCESSORIES

LAVA ROCK - GA6060

For all models.

 Order when additional rock 

is desired. (1.8 lb. bag)

CLEANING KIT - CCK

For all models.

 Your vent-free gas appliance 

requires regular cleaning and maintenance to 
prevent performance problems. This kit gives 
you the tools and instructions to make it easy 
to clean all critical areas of your appliance.

Summary of Contents for PFS VF-18N-MHD

Page 1: ...ppliance Do not touch any electrical switch do not use any phone in your building Immediatelycallyourgassupplierfromaneighbor s phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the fire department Installation and service must be performed by a quali fied installer service agency or the gas supplier MODELS VF 18N MHD VF 18P MHD VF 24N MHD AND VF 24P MHD UNVEN...

Page 2: ...damage Refer to this manual for correct installation and operation al procedures For assis tance or additional infor mation consult a qualified installer serviceagencyor the gas supplier WARNING This ap pliance is for installation only in a solid fuel burning masonry or UL127 fac tory built fireplace or in a listed ventless firebox en closure It is design certi fied for these installations in acco...

Page 3: ...certain you read and understand all warnings Keep this manual for reference It is your guide to safe and proper operation of this heater WARNING Any change to this heater or its controls can be dangerous WARNING Do not use a blower insert heat exchanger insertorotheraccessorynotap proved for use with this heater SAFETY Continued WARNING Donotallowfans to blow directly into the heater Avoidanydraft...

Page 4: ...r on adjacent walls or furniture 10 This heater needs fresh outside air ven tilation to run properly This heater has an oxygen depletion sensing ODS pilot light safety system The ODS shuts down the heater if not enough fresh air is available See Air for Combustion and Ventilation page 5 If heater keeps shutting off see Troubleshooting page 21 11 Do not run heater where flammable liquids or vapors ...

Page 5: ...or vent free operation with flue damper closed It has been tested and approved to ANSI Z21 11 2 standard for unvented heaters State and lo cal codes in some areas prohibit the use of vent free heaters SAFETY PILOT This heater has a pilot with an Oxygen Deple tion Sensing ODS safety shutoff system The ODS pilot is a required feature for vent free room heaters The ODS pilot shuts off the heater if t...

Page 6: ...and Unconfined Space The National Fuel Gas Code ANSI Z223 1 NFPA 54 defines a confined space as a space whose volume is less than 50 cubic feet per 1 000 Btu hr 4 8 m3 per kw of the aggregate input rating of all appliances installed in that space and an unconfined space as a space whose volume is not less than 50 cubic feet per 1 000 Btu hr 4 8 m3 per kw of the aggregate input rating of all applia...

Page 7: ... 1 NFPA54 theInternationalFuelGasCode or applicable local codes VENTILATION AIR Ventilation Air From Inside Building This fresh air would come from an adjoining unconfined space When ventilating to an adjoining unconfined space you must provide two permanent openings one within 12 of the ceiling and one within 12 of the floor on the wall connecting the two spaces see options 1 and 2 Figure 2 You c...

Page 8: ...a tion page 5 CHECK GAS TYPE Use the correct gas type natural or propane LP for your unit If your gas supply is not cor rect do not install heater Call dealer where you bought heater for proper type heater NOTICE This heater is intended for use as supplemental heat Use this heater along with your primary heating system Do not install this heater as your pri mary heat source If you have a centralhe...

Page 9: ...Wall Minimum 16 from Side Wall Example LOG SIZING REQUIREMENTS Minimum Firebox Size Log Size Height Depth Front Width Rear Width 18 20 14 35 22 1 2 24 20 14 35 22 1 2 Measured at 14 depth Minimum Noncombustible Material Clearances If Not Using Mantel Note If using a mantel proceed to If Using Mantel If not using a mantel follow the infor mation below You must have noncombustible material s above f...

Page 10: ... Fireplace Figure 7 Minimum Mantel Clearances When Using Hood Minimum Noncombustible Material 8 Min 12 15 18 20 2 6 8 10 12 Distances to Underside of Mantel Hood GA6050 GA6052 or GA6053 Top of Fireplace Opening Underside of Mantel Shelf Mantel Shelf Noncombustible Material Distance A Requirements for Safe Installation 12 or more Noncombustible material OK Between 8 and 12 Install fire place hood a...

Page 11: ...e height remove the mantel FLOOR CLEARANCES A If installing appliance on the floor level you must maintain the minimum distance of 14 to combustibles see Figure 8 B If combustible materials are less than 14 to the fireplace you must install appliance at least 5 above the combustible flooring see Figure 9 INSTALLATION Continued Figure 8 Minimum Fireplace Clearances If Installed at Floor Level Figur...

Page 12: ...urchase the optional CSA design certified equipment shutoff valve from your dealer See Acces sories page 25 For propane LP units the installer must supply an external regulator The external regulator will reduce incoming gas pressure You must reduce incoming gas pressure to between 11 and 14 of water If you do not re duce incoming gas pressure heater regulator damage could occur Install external r...

Page 13: ...g main gas valve located on or near gas meter for natural gas or using compressed air INSTALLATION Continued Installation must include an equipment shutoff valve union and plugged 1 8 NPT tap Locate NPT tap within reach for test gauge hook up NPT tap must be upstream from heater see Figure 12 IMPORTANT Install equipment shutoff valve in an accessible location The equipment shutoff valve is for tur...

Page 14: ...id to all joints Bubbles forming show a leak 4 Correct all leaks at once PRESSURE TESTING HEATER GAS CONNECTIONS 1 Open equipment shutoff valve see Fig ure 13 2 Open main gas valve located on or near gas meter for natural gas or open pro pane LP supply tank valve 3 Make sure control knob of heater is in the OFF position 4 Check all joints from equipment shutoff valve to control valve see Figure 14...

Page 15: ...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 pilot 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 ...

Page 16: ...switch is located inside the hand held control at the top of the battery compartment Then press the receiver s reset button on the bottom of the receiver module until you hear a second longer signal When pressing the button on the remote handset in the following 20 sec the receiver learns the new code OPERATION Continued REMOTE LIGHTING INSTRUCTIONS WARNING If fireplace has glass doors never opera...

Page 17: ...perature with set temperature and sends a signal to the receiver to turn gas valve motor up or down to adjust flame height accordingly The nighttime setback temperature TEMP appears on display The sensor in the transmitter measures the temperature and adjusts it according to the nighttime setback temperature There is a bigger temperature differential during this cycle Timer The timer mode TIMER op...

Page 18: ...F position OPERATION Continued MANUAL LIGHTING PROCEDURE WARNING Manual lighting mustbeperformedbyaqualified service person The system has a MANUAL OVERRIDE feature that allows you to light with a match Lighting with a Match 1 STOP Read the safety information on page 15 2 Make sure equipment shutoff valve is fully open 3 Turn motor knob clockwise to to OFF position 4 Wait 5 minutes to clear any ga...

Page 19: ...ubleshooting page 21 Figure 23 Correct Burner Flame Pattern Figure 24 Incorrect Burner Flame Pattern Blue Bright Yellow Flames Orange Flames INSPECTING BURNERS Check pilot flame pattern and burner flame patterns often PILOT FLAME PATTERN Figure 21 shows a correct pilot flame pattern Figure 22 shows an incorrect pilot flame pat tern The incorrect pilot flame is not touching the thermocouple When th...

Page 20: ...ng operation and have heater inspected yearly by a qualified service person We also recommend that you keep the burner tube clean and free of dust and dirt We rec ommend using compressed air no greater than 30 PSI Your local computer store hardware store or home center may carry compressed air in a can If using compressed air in a can please follow the directions on the can If you don t follow dir...

Page 21: ...tting is not correct 9 Bad module 1 Inlet gas pressure is too low 2 Wire disconnected from gas control 3 Burner orifice s clogged 4 Bad module OBSERVED PROBLEM When and are pressed at the same time there is no spark at ODS pilot When and are pressed there is spark at ODS pilot but no ignition Burner does not light after pilot is lit REMEDY 1 Push switch on valve to position 2 Replace batteries 3 R...

Page 22: ...f operation 1 Turn control knob to LO position and let warm up for a minute 2 Operate burner until air is removed from line Have gas line checked by local natural or propane LP gas company 3 Observeminimuminstallation clearances see page 9 4 Clean burner see Cleaning and Maintenance page 20 or replace burner orifice 1 Turn heater off when us ing furniture polish wax carpet cleaners or similar prod...

Page 23: ...rtially clogged 4 Thermostat on remote is satisfied 1 Gas leak See Warning statement at top of page 2 Control valve or gas control defective 1 Foreign matter between control valve and burner 2 Gas leak See Warning statement at top of page REMEDY 1 Replace batteries in re ceiver and remote control 2 Replace module 1 This is normal with most heaters If noise is exces sive contact qualified ser vice ...

Page 24: ...Switch Soldered Cable Thermocurrent Cable 1 Motor Knob MAN Knob TROUBLESHOOTING Continued POSSIBLE CAUSE Battery nearly down When signal appears the first time ap proximately 10 ignitions left Cableisnotconnected ON OFF switch is in OFF position Ignition not successful possible air in supply line REMEDY Replace battery Connect cables Switch to ON Repeat procedure OBSERVED PROBLEM Long signals 0 8 ...

Page 25: ...an t supply original replacement part s call DESA Heating LLC at 1 866 672 6040 for referral information A list of authorized dealers can be found by visiting www desatech com When calling DESA Heating LLC have ready model and serial numbers of your heater the replacement part number SERVICE HINTS When Gas Pressure Is Too Low pilot will not stay lit burners will have delayed ignition heater will n...

Page 26: ...86 01F 26 PARTS MODELS VF 18N MHD VF 18P MHD VF 24N MHD AND VF 24P MHD 1 2 3 4 5 25 22 7 8 18 9 6 10 11 26 31 34 23 12 21 20 29 28 29 28 27 24 27 24 22 13 19 14 32 30 15 15 15 15 15 15 31 15 15 15 15 15 15 15 16 17 16 33 31 ...

Page 27: ...01 117004 01 Pilot Shield 1 20 099918 03 099918 02 099918 03 099918 02 Burner Regulator 1 21 116957 01 111803 03 116957 01 Air Shutter 1 22 111824 01 111824 01 111824 01 111824 01 Nut Sleeve 3 8 2 23 111828 01 111828 01 111828 01 111828 01 Nut Sleeve 3 16 1 24 111817 05 111817 05 111817 05 111817 05 3 8 Flextube 7 2 25 111817 04 111817 04 3 8 Flextube 21 1 111817 09 111817 09 3 8 Flextube 26 1 26 ...

Page 28: ... approved by DESA Heating LLC Warranty parts must be obtained through authorized dealers of this prod uct and or DESA Heating LLC who will provide original factory replacement parts Failure to use original factory replacement parts voids this warranty Travel handling transportation diagnostic material labor and incidental costs associated with warranty repairs unless expressly covered by this warr...

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