NG to LP Conversion Guide

Form CP-UD-GC, P/N 197209R11, page 2
Gas Conversion
Instructions
1. Check kit contents for agreement with the parts list and the size of heater being
serviced. (See the parts lists and application for each kit on pages 7-10.)
Conversion of a unit using these kits will not alter the input rate. Refer to the rating
plate on the heater for input rate and other appropriate information.
(NOTE: If adjusted for high altitude operation, input rate will be affected. For high
altitude input ratings and capacities, refer to TABLE 3A on page 11 for UDAS and
UDAP or TABLE 3B on page 12 for Models UDBP and UDBS.)
2. Turn off the gas supply at a shutoff valve outside of the heater and turn off
the electrical supply. Open the control access panel.
3. Select and Install the Regulator Spring Kit (valve conversion kit)
All kits include two or three regulator spring kits. Check the package carefully
and choose the regulator spring kit that corresponds with the valve on the heater.
NOTE: The other regulator spring kit(s) will not be used.
General and Warnings (cont’d)
Application and Kit
Selection
The gas conversion kits in these instructions are for Model UDAP, UDAS, UDBP, and
UDBS heaters equipped with either a single-stage or two-stage gas valve. Each kit
includes two or three spring kits and burner orices for multiple sizes. See pages 7
through 10 for a list of conversion kit components. Some parts will not be used; select
the parts to be used carefully.
Kit P/N’s, Application, and Components
• Natural TO Propane Kits .......pages 7-8
• Propane TO Natural Kits .......page 9-10
DANGER
Thegasburnerinthisgas-redequipmentisdesignedtoprovidesafecomplete combustion.
However, if the installation does not permit the burner to receive the proper supply of com-
bustion air, complete combustion may not occur. The result is incomplete combustion which
produces carbon monoxide, a poisonous gas that can cause death.
Safeoperationofindirect-redgasburningequipmentrequiresaproperlyoperatingventsys-
temwhichventsallueproductstotheoutsideatmosphere. FAILURE TO PROVIDE PROPER
VENTING WILL RESULT IN A HEALTH HAZARD WHICH COULD CAUSE SERIOUS PERSONAL
INJURY OR DEATH.
On separated combustion Model UDAS and UDBS heaters, install either the horizontal or
vertical combustion air/vent system illustrated in the heater venting manual, using the
concentric adapter supplied. For all heater installations, always comply with the combustion
air requirements in the installation codes and instructions. Model UDAP and UDBP units
installedinaconnedspacemustbesuppliedwithairforcombustionasrequiredbyCode
and in the heater installation manual. Combustion air at the burner should be regulated only by
manufacturer-provided equipment. NEVER RESTRICT OR OTHERWISE ALTER THE SUPPLY
OF COMBUSTION AIR TO ANY HEATER. MAINTAIN THE VENT OR VENT/COMBUSTION AIR
SYSTEM IN STRUCTURALLY SOUND AND PROPER OPERATING CONDITION.
WARNING
Regulator spring kits are not interchangeable. Each spring kit
must be used only in the model and type of valve for which
the kit is designated. Verify compatibility before installing the
regulator spring kit.
To install the spring regulator conversion kit, follow the valve manufacturer’s
installation instructions that are included with the spring conversion kit. After a
new regulator spring kit is installed, it is necessary to adjust the spring for the
correct manifold pressure. This adjustment can only be made after the heater is in
operation; instructions are included in Step No. 7.