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113084-01E26
WIRING DIAGRAM
Note: For proper operation of optional accessories,
the wires from the switch to the control must be
connected exactly as shown.
A
U
T
O
O
F
F
ON
Thermopile
SPECIFICATIONS
SVYD18PRA
• Rating: 21,000/31,000 Btu (Variable)
• Gas Type: Propane/LP
• Ignition: Piezo
• Pressure Manifold: 8" WC
• Inlet Gas Pressure (in. of water):
Maximum - 14", Minimum - 11"
• Shipping Weight: 28 lbs.
SVYD18NRA
• Rating: 24,000/35,000 Btu (Variable)
• Gas Type: Natural
• Ignition: Piezo
• Pressure Manifold: 3.5" WC
• Inlet Gas Pressure (in. of water):
Maximum - 10.5", Minimum - 5"
• Shipping Weight: 28 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 specied heat
• propane/LP gas supply may be low (propane/LP
only)
You may feel your gas pressure is too low. If so, con-
tact your local propane/LP or natural gas supplier.
TECHNICAL SERVICE
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.