Wiring diagram, Specifications, Replacement parts – Desa VYM27NR User Manual

Page 21: Service hints, Technical services, Cleaning and maintenance

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108382-01G

21

Clean the pilot assembly also. A yellow tip on the

pilot flame indicates dust and dirt in the pilot as-

sembly. There is a small pilot air inlet hole about

two inches from where the pilot flame comes out of

the pilot assembly (see Figure 33, page 20). With

the unit off, lightly blow air through the air inlet

hole. You may blow through a drinking straw if

compressed air is not available.

LOGS

• If you remove logs for cleaning, refer to Install-

ing Logs, page 15, to properly replace logs.

• Replace log(s) if broken or chipped (dime-

sized or larger).

WIRING DIAGRAM

Note:

For proper operation of optional accessories,

the wires from the switch to the control must be

connected exactly as shown.

CLEANING AND

MAINTENANCE

Continued

AUTO

OFF

ON

Thermopile

SPECIFICATIONS

Natural Gas

• Rating (Variable): 20,000/39,000 Btu/Hr

• Gas Type: Natural Gas

• Ignition: Piezo

• Manifold Pressure: 3.5" W.C.

• Inlet Gas Pressure (in. of water):

Maximum - 10.5", Minimum* - 5"

• Shipping Weight: 32 lbs.
Propane/LP

• Rating (Variable): 20,000/39,000 Btu/Hr

• Gas Type: Propane/LP

• Ignition: Piezo

• Manifold Pressure: 8.0" W.C.

• Inlet Gas Pressure (in. of water):

Maximum - 14", Minimum* - 11"

• Shipping Weight: 32 lbs.

* For input adjustment

REPLACEMENT PARTS

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 Products’ Technical Service

Department at 1-866-672-6040. When calling

DESA Heating Products, have ready

• your name and address

• model and serial numbers of your heater

• how heater was malfunctioning

• type of gas used (propane/LP or natural gas)

• 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 Products at 1-866-672-6040 for referral

information. When calling DESA Heating Products,

have ready

• model number 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 natural or propane/LP gas

supplier.

TECHNICAL SERVICES

You may have further questions about installation,

operation, or troubleshooting. If so, contact DESA

Heating Products’ Technical Service Department

at 1-866-672-6040. When calling please have your

model and serial numbers of your heater ready.

You can also visit DESA Heating Products’ techni-

cal services web site at

www.desatech.com

.

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