with 1-Stage Gas Control Option AG1 or with 2-Stage
Gas Control Options AG2, AG3, AG15, and AG16
®
Models PDH, SDH, and RDH
General and
Warnings
HAZARD INTENSITY
LEVELS of Warnings
in this Manual
All gas conversion must be done by a qualied service person in compliance with the
National Fuel Gas Code NFPA 54 / ANSI Z223.1 (latest edition), these instructions,
and other applicable codes and requirements.
In Canada, gas conversion shall be carried out in accordance with the requirements of
the Provincial Authorities having jurisdiction and in accordance with the requirements
of the CAN/CSA-B149.1 (latest edition), Natural and Propane Gas Installation Code.
1. DANGER: Failure to comply will result in severe personal injury or death
and/or property damage.
2. WARNING: Failure to comply could result in severe personal injury or
death and/or property damage.
3. CAUTION: Failure to comply could result in minor personal injury and/or
property damage.
WARNING
Improper installation, adjustment, alteration, service,
or maintenance can cause property damage, injury, or
death. Read the installation, operation and maintenance
instructions thoroughly before installing or servicing this
equipment.
FOR YOUR SAFETY
— 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
your building.
• Leave the building immediately.
• Immediately call your gas supplier from a phone remote
from the building. Follow the gas supplier’s instructions.
in accordance with these instructions and in compliance with all codes and
requirements of authorities having jurisdiction. Failure to follow instructions
performing this work assumes responsibility for this conversion.
Form CP-PREEVA-GC, P/N 212063 R7, Page 1
General and Warnings (cont’d)
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 combustion
air, complete combustion may not occur. The result is incomplete combustion which produces
carbon monoxide, a poisonous gas that can cause death.
Safeoperationofindirect-redgasburningequipmentrequiresaproperlyoperatingventsystem
whichvents allueproductstotheoutsideatmosphere. FAILURE TO PROVIDE PROPER VENT-
ING WILL RESULT IN A HEALTH HAZARD WHICH COULD CAUSE SERIOUS PERSONAL INJURY
OR DEATH.
On separated combustion Model SDH 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
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.
Application and Kit
Selection
Gas Conversion
Instructions
The gas conversion kits in these instructions are for Model PDH, Model SDH, and
Model RDH PREEVA® Series packaged heaters equipped with gas control Option AG1,
AG2, AG3, AG15, or AG16. Conversion kits include one or two spring kits for a singlestage valve and one for a two-stage valve. All conversion kits include burner orices
for multiple sizes. See page 7 for conversion kit P/N’s, application, and components.
NOTE: These kits DO NOT APPLY to units with Control Option AG40, AG60, AG61,
AG62, DG1, DG2, DG5, DG6, D12B, D12C, D12F, or D12G). If converting a unit with
any of these control options, contact the factory.
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 page 7.)
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 or 3B, page 8.)
2. Turn off the gas supply at a shutoff valve outside of the heater and turn off
the electrical supply. Open the burner section door.
3. Select and Install the Regulator Spring Kit (valve manufacturer’s conversion
kit)
All conversion kits include one or two regulator spring kits for a single-stage
valve and one for a two-stage valve. Check the package carefully and choose
the regulator spring kit that corresponds with the valve on the heater. NOTE: The
other regulator spring kits will not be used.
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 spring kit.
To install the spring regulator conversion kit, follow the valve manufacturer’s
installation instructions that are included with the spring 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. 6.
Form CP-PREEVA-GC, P/N 212063 R7, Page 2
WARNING
FIGURE 1 - Burner and
Pressure Switch
If installation is above 6000 ft (1830M),
pressure switch may need to
be changed. Follow high altitude
instructions on page 4.
Control Side
Electrical Compartments
Burner with Venturi Tube (See FIGURE 2A)
Gas Valve
Follow manufacturer's
instructions to install
regulator spring kit.
Low Voltage Electrical
Section
(Depending on size,
controls may appear
differently, but conversion
instructions are the
Because each kit is designed to convert more than one size of heater, there are
two or three burner orices per kit. From TABLE 1 below, nd the marking that
appears on the orice for the heater being converted. Select the orice from the
kit that has the marking required for the size of heater. The other orice(s) will
not be used in this conversion.
4B.LocatetheOriceonall Sizes AND the Air Restrictor Plate on Sizes 75, 100,
the marking with the size listed in
TABLE 1, page 3.)
Venturi
Tube
Gas Flow from
Gas Valve
(Tabs are
not bent;
see below.)
Air Restrictor Plate ONLY FOR PROPANE Applies to Sizes 75, 100, 125, 150, and 175
when using propane only.
Form CP-PREEVA-GC, P/N 212063 R7, Page 3
Gas Conversion
Instructions
(cont’d)
• Air restrictor plate MUST be added when converting sizes listed to propane. See
FIGURES 2A & 2B and the instructions in Step 4C.
• Air restrictor plate MUST be removed when converting to natural gas. See
FIGURES 2A & 2B and the instructions in Step 4C.
WARNING
Sizes 75, 100, 125, 150, and 175 - Failure to install or remove air restrictor plate according to
directions could cause property damage, personal injury, and/or death.
FIGURE 2B Location of Holding
Tabs on the Air
Restrictor Plate used
on Sizes 75, 100,
125, 150, and 175.
Restrictor plate is
used ONLY when
burning propane on
the sizes listed.
Select and follow instructions in appropriate section in
Step 4C. To install or remove air restrictor plate follow
instructions below.
To install, slide the restrictor in place so that the
45° angle is hooked over the rear of the venturi
tube.
On the front of the venturi tube, bend the two
tabs as shown to hold the restrictor in place.
To remove, carefully unbend tabs.
Natural Gas TO Propane - Applies to Sizes 75, 100, 125, 150, 175
1) Refer to FIGURE 2A and locate the gas orice. Carefully remove the natural gas orice.
2) Install the air restrictor plate. Slide the air restrictor plate over the venturi opening, positioning as illustrated in
FIGURE 2A.
3) Refer to FIGURE 2B. Holding the air restrictor plate in position, use a pair of pliers to bend the tabs to “lock”
the air restrictor plate to the venturi tube. Be sure air restrictor is aligned and secure.
4) Install the propane orice selected for the heater in Step 4A, page 3.
Propane TO Natural Gas - Applies to Sizes 75, 100, 125, 150, 175
1) Refer to FIGURES 1 and 2A and locate the gas orice. Carefully remove the propane gas orice.
2) Refer to FIGURES 2A and 2B and locate the air restrictor plate on the venturi tube. Using a pair of pliers, very
carefully unbend the tabs and remove the air restrictor plate.
3) Install the natural gas orice selected for the heater in Step 4A, page 3.
Natural Gas to Propane OR Propane to Natural - Applies to Sizes 200, 225, 250, 300, 350, 400A
1) Refer to FIGURES 1 and 2A and locate the gas orice. Carefully remove the gas orice.
2) Install the orice selected for the heater in Step 4A, page 3.
Operation Above an
Elevation of 6000 ft
(1830M)
NOTE: If elevation is above 6000 ft (1830M), the unit being converted requires a
high altitude pressure switch. When ordered with Option AB6, AB7, or AB8, the unit is
factory-equipped with a high altitude pressure switch. Verify on the rating plate whether
or not the unit was ordered for above 6000 ft (1830M).
If the unit was not ordered for operation above 6000 ft (1830M) but will be operated
above 6000 ft (1830M) and has a single-stage or two-stage gas control, contact your
distributor to obtain a replacement switch. Follow the instructions below to install the
high altitude pressure switch before starting the heater.
(NOTE: Conversely, if the rating plate does indicate that the unit is equipped for opera-
tion above 6000ft (1830M) and the installation is below that elevation, contact your
distributor to obtain the appropriate pressure switch.)
FIGURE 3 -
Install High
Altitude
Pressure
Switch
required above
6000 ft (1830M)
elevation
Form CP-PREEVA-GC, P/N 212063 R7, Page 4
Pressure
Switch
Instructions for Changing the Pressure Switch
1. In the control compartment, locate the pressure switch.
2. Mark and disconnect the two wires attached to the pressure switch.
3. Disconnect the sensing tube(s) from the pressure switch.
4. Locate the two screws holding the switch mounting bracket.
Remove the screws (save screws) and the pressure switch.
5. Using the same screws, install the correct pressure switch. Attach
the sensing tube(s) and wires.
FIGURE 4 - Top View
of Valves identifying
Pressure Taps and
Adjustment Screws
Single-Stage
Valve
(two styles)
5. Turn on the electricity and the gas. Relight, following the instructions on the
heater. Check for gas leaks using a commercial leak detecting uid or a rich soap
and water solution. Leaks are indicated by the presence of bubbles. Check all
connections. If a leak cannot be stopped by tightening, replace the part.
6. Adjust the manifold pressure. Follow these requirements and instructions to
adjust manifold gas pressure.
1) The correct pressure adjustment depends on the area of the country in terms of
elevation. Refer to TABLE 2 and determine the required valve outlet pressure
for the elevation where the heater will be operating. If you don’t know the
elevation, check with your local gas company.
2) Locate the 1/8” output pressure tap on the valve (See FIGURE 4). Turn the
knob or switch on the top of the valve to “OFF”. Connect a manometer to the
1/8” pipe outlet pressure tap in the valve. Use a water column manometer that
is readable to the nearest tenth of an inch.
Adjust Outlet
Pressure
Inlet
Pressure Tap
1/8” Outlet
Pressure Tap
Two-Stage Valve
Adjust High
Fire Outlet
Pressure
Adjust Low
Fire Outlet
Pressure
Adjust Outlet Pressure
Inlet Pressure Tap
TABLE 2 - Valve Outlet
Pressure Settings by
Elevation, Control
Option, and Fuel Type
CAUTION
DO NOT bottom
out the gas
valve regulator
adjusting screw.
This can result
in unregulated
manifold pressure
causing excess
overreandheat
exchanger failure.
Inlet
Pressure
1/8” Outlet
Tap
Pressure Tap
Applies to Model PDH, SDH, and RDH with Gas Controls listed
Altitude
FEETMETERS
Manifold Pressure Settings (inches w.c.) by Altitude for Installation in the UNITED STATES
Manifold Pressure Settings (inches w.c.) by Altitude for Installation in CANADA
0 - 20000 - 6103.510.01.85.0
2001 - 4500 611 - 13732.88.11.54.1
3) Single-Stage and Two-Stage High Fire - Turn the knob or switch on the top
of the valve to “ON”. Remove the cap from the pressure adjusting screw and
adjust the gas train pressure to the pressure selected from the table. Adjust
pressure by turning the regulator screw IN (clockwise) to increase pressure or
OUT (counterclockwise) to decrease pressure.
Two-Stage Low Fire - Disconnect the wire from the “HI” terminal on the gas
valve and check the low re pressure. Turn the regulator screw to adjust
the low re outlet pressure to the “Low Fire” pressure listed in the table.
Re-connect the wire to the gas valve.
4) Turn up the thermostat. (NOTE: On Model SDH, depress and hold the door
safety switch.) Cycle the burner once or twice to properly seat the adjustment
spring in the valve.
Normal Manifold Pressure (Single-
Stage and Two-Stage High Fire) -
Applies to Options AG1, AG2, AG3,
AG15, AG16
NATURALPROPANENATURALPROPANE
Form CP-PREEVA-GC, P/N 212063 R7, Page 5
2-Stage Low-Fire Manifold
Pressure - Applies to Options
1/8” Outlet
Pressure Tap
AG2, AG3, AG15, AG16
Gas Conversion
Instructions (cont’d)
Re-check the pressure. When the outlet pressure is right for the installation,
remove the manometer and replace the cap.
Check for leakage at the pressure tap tting.
5) With the heater operating, determine that the inlet pressure to the heater is
between 5 and 14 inches w.c. for natural gas or between 10 and 14 inches
w.c. for propane. Take this reading as close as possible to the heater. (The gas
valves have an inlet pressure tap; see FIGURE 4.) If the inlet pressure is not
within the specied range, the inlet pressure must be corrected and the manifold (outlet) pressure re-checked.
6) If the gas valve has been adjusted for operation above 2000 ft, nd the High
Altitude Adjustment label in the kit. Using a permanent marker, ll in the appropriate information from TABLE 3, page 8. Select a location for the label on the
outside of the heater so that it will be conspicuous to anyone operating or servicing the unit.
Be sure the surface is clean and dry and adhere the label. (NOTE: At altitudes
from 0-2000 ft (0-610M), this label is not used.)
7. Check for safe and proper operation of the heater by observing operation for at
least one complete cycle. (NOTE: Model SDH, depress and hold the safety door
switch.)
8. Fill in the information required on the gas conversion tape. Select a location near
the rating plate. Be sure the surface is clean and dry and afx the tape to the
heater. Close the door.
De-Coding the
Heater Serial
Number
The identifying model and serial number can be found on the heater rating
plate. When converting fuels, it is necessary that you have the complete heater
model and serial number. See the example below to determine the serial num-
ber valve code. Theratingplateidentiesoriginalequipmentonlysoalso
compare the label on the gas valve with the description listed.
Serial No. Example:
Code for Year and Month the
Heater was Manufactured
Gas Conversion
Kit Application and
Components
BLJ78U2N99999
Controller
These conversion kits apply only to Model PDH, Model SDH, and Model RDH
with a single-stage gas valve or two-stage control Option AG2, AG3, AG15,
or AG16. Each kit applies only to the sizes listed. All kits include orices and
spring kits that will not be used on all conversions; select parts carefully.
Natural to Propane Kits (Verify kit application.)
Natural TO Propane Conversion Kit, P/N 269846
Applies to: Models PDH, SDH, RDH Sizes 75 and 100
Equipped with one of the following valves:
Serial No. Code Description
Y2 or Z7VR8205K2957, Single-stage, 1/2”
6EVR8215T1239, Single-stage, 1/2”
Y8 or 4AVR8205N2921, Two-stage, 1/2”
Components:
QtyP/NDescription
198720
1260605 Spring Kit #396221 for a VR8215Single-Stage Valve6E
1197207
1196852 SIZE 75 - Burner Orice, #39
1205720 SIZE 100 - Burner Orice, 2.9mm
1202051 Primary Air Restrictor, 1-9/16” (40mm) diameter opening
164391 Conversion Tape
137752 Propane Gas Disk
1197062 High Altitude Adjustment Label (use above 2000ft/610M)
Spring Kit #393691 for VR8105, VR8205, VR8305
Single-Stage Valves
Spring Kit #396021 for VR8105, VR8205, VR8305
Two-Stage Valves
Use in
Valve w/
Serial
No. Code
Y2, Z7
Y8, 4A
Ignition
Type of
Valve
Type of Gas
(N = Natural; L = Propane)
Natural TO Propane Conversion Kit, P/N 269847
Applies to: Models PDH, SDH, RDH Sizes 125 and 150
Equipped with one of the following valves:
Serial No. Code Description
Y2 or Z7VR8205K2957, Single-stage, 1/2”
6EVR8215T1239, Single-stage, 1/2”
Y8 or 4AVR8205N2921, Two-stage, 1/2”
Components:
QtyP/NDescription
198720
1260605 Spring Kit #396221 for a VR8215Single-Stage Valve6E
1197207
1196838 SIZE 125 - Burner Orice, #30
1196898 SIZE 150 - Burner Orice, 9/64
1202051 Primary Air Restrictor, 1-9/16” (40mm) diameter opening
164391 Conversion Tape
137752 Propane Gas Disk
1197062 High Altitude Adjustment Label (use above 2000ft/610M)
Spring Kit #393691 for VR8105, VR8205, VR8305
Single-Stage Valves
Spring Kit #396021 for VR8105, VR8205, VR8305
Two-Stage Valves
Consecutive
Number
Use in
Valve w/
Serial
No. Code
Y2, Z7
Y8, 4A
Form CP-PREEVA-GC, P/N 212063 R7, Page 6
Natural to Propane Kits (cont’d)
(Verify kit application.)
Natural TO Propane Conversion Kit, P/N 269848
Applies to: Models PDH, SDH, RDH Sizes 175, 200, 225
Equipped with one of the following valves:
Serial No. Code Description
Y2 or Z7VR8205K2957, Single-stage, 1/2”
6EVR8215T1239, Single-stage, 1/2”
Y3 or Z8VR8305K4241, Single-stage, 3/4”
Y8 or 4AVR8205N2921, Two-stage, 1/2”
Y9 or 5AVR8305N4297, Two-stage, 3/4”