Unitary products group P HU Series, P DN Series, G8T-UH, L8T-UH, FL8 Installation Instructions Manual
...
035-14446-000 Rev. B (1002)
ACCESSORY KIT INSTALLATION INSTRUCTIONS
HIGH ALTITUDE APPLICATION CONVERSION
MID-EFFICIENCY SINGLE-STAGE INDUCED COMBUSTION FURNACES
MODELS: P*HU/G8T-UH/L8T- UH/FL8 UPFLOW / HORIZONTAL
P*DN/G8T-DN/L8T-DN DOWNFLOW
This conversion kit is to be installed by a qualified service agency in accordance with the manufacturer’s instructions
and all applicable codes and requirements of the authority having jurisdiction. If the information in these instructions is
not followed exactly, a fire, an explosion or production of carbon monoxide may result causing property damage, personal injury or loss of life. The qualified service agency is responsible for the proper installation of this kit. The installation is not proper and complete until the operation of the converted appliance is checked as specified in the
manufacturer’s instructions supplied with the kit.
The conversion of new certified central heating gas appliances must conform to directions outlined in this instruction.
Installation must be made in accordance with American National Standard National Fuel Gas Code, ANSI Z223.1-lat-
est edition, unless superseded by local codes. For Canadian installations, the conversion shall be carried out in accordance with the requirements of the Provincial authorities having jurisdiction and in accordance with the CAN1-B149.1
and .2 installation codes.
The manufacturer accepts no responsibility for malfunctions due to improper conversions.
GENERAL
This instruction is intended for the conversion of new equipment only, for operation at altitudes greater than 4,500 ft.
above sea level. Follow the basic unit installation instruction
for all other aspects of the installation.
All units are equipped to operate up to 4,500 feet above sea
level without a high altitude kit. Installations above 2,000 ft.
must be field derated as required by the National Fuel Gas
Code, ANSI Z223.1 (latest edition), or in Canada, CAN/CGA
B149.1 or .2 and all other applicable local codes and utility
requirements.
This instruction provides the necessary information to select
and install both the proper pressure switch and orifice for
your specific application. Data is provided for both natural
and propane (LP) gases. This high altitude pressure switch
and accessory includes a special switch and other items as
detailed below.
Improper installation, adjustment service, or maintenance can cause injury or property damage; therefore, only a qualified installer or qualified service
personnel should perform this conversion.
.
COMMON PARTS
Description Part Number Quantity
Conversion Label 035-11635-000 1
Install. Instruction. 035-14446-000 1
PRESSURE SWITCH
Accessory Kit Switch Part Number Pressure Setting
1PS0301 024-27669-00* .35 IWG
1PS0302 024-27627-00* .42 IWG
1PS0311 024-27626-00* .40 IWG
1PS0312 024-27628-00* .45 IWG
* May be any numeral 0-9.
PRESSURE SWITCH
For installations below 4500 ft., refer to furnace installation
instructions to properly derate applications which do not
require a pressure switch change. For applications above
4,500 feet, a pressure switch change is required to provide
safe and reliable operation. Table 1 indicates the correct
pressure switch accessory for each unit model applied.
Do not adjust the original pressure switch to allow
operation at high altitude. Unsafe operation will
result.
Table 1:
HIGH ALTITUDE PRESSURE SWITCH USAGE
INPUT
(MBH)
40 32 1PS0301
57 46 1PS0301
80 64 1PS0301
100 80 1PS0311
115 92 1PS0311
130 104 1PS0311
160 130 1PS0301
OUTPUT
(MBH)
Upflow / Horizontal & Downflow Models
ACCESSORY
PART NUMBER
Unitary Products Group
035-14446-000 REV. A (0301)
The high altitude pressure switch should be changed by following this procedure.
The gas supply shall be shut off prior to disconnecting the electrical power, before proceeding
with the conversion.
1. Remove the burner access door.
2. Note the location of the wires on the pressure control
and then disconnect them. Remove the hose from the
pressure control.
3. Remove the screws securing the pressure control and
remove it from the unit. Check that the new pressure
control kit is correct for your application (Refer to “Pressure Switch” Table on page 1). Install the new pressure
control.
4. Replace the hose and wiring as originally connected.
ORIFICE SIZE SELECTION
A number of factors determine the correct orifice usage for
your application. These factors include the original orifice sizing, BTU content of the gas and the altitude.
For natural gas applications, contact your gas supplier for the
actual BTU content (heating value) of the fuel provided at
your altitude. Table 3 indicates various BTU content fuels.
The standard orifice used in the furnace is shown in Table 2.
Find your unit and determine the standard orifice provided.
Use the BTU heating value from Table 3 or 4 that is nearest
to your value. Read across the selected table from the standard orific e to the altitude for your applica tion and note the
new orifice size.
EXAMPLE: If your unit has a #45 orifice as standard and a
heating gas value of 900 BTU/CU.FT., at an altitude of 7,000
feet a #47 orifice will provide the correct firing rate.
For propane (LP) applications, Use Table 4 to select the
proper high altitude orifice size.
The furnace must first be converted to use propane (LP) through the use of the sta ndard pro pane
conversion ki t accessory.
After selecting the proper orifice size for your application, see
Table 5 for the listing that indicates the part number for your
required orifice number. The orifices may be obtained
through your local Source 1 Parts Distribution Center.
The high altitude orifices should be changed by the following
procedure:
Table 2:
STANDARD ORIFICE USAGE
INPUT
(MBH)
40 32 #45 #55
57 46 #45 #56
80 64 #45 #55
100 80 #45 #55
115 92 #45 #55
120 96 #45 #56
130 105 #45 #56
160 130 #43 #54
OUTPUT
(MBH)
Upflow/Horizontal & Downflow Models
NATURAL
ORIFICE SIZE
ORIFICE SIZE
PROPANE
1. Carefully remove the wires from the gas valve and note
their location so they may properly replaced. Remove
the four screws that hold the manifold to the manifold
support bracket and slide the manifold and orifices back
out of the burners.
2. Remove the main burner orifices from the manifold and
discard them.
3. Install the derate main burn er orifi ces in the manifo ld and
tighten them.
4. Reinstall the manifold in the assembly by reversing the
removal process.
2 Unitary Products Group
Loading...