Unitary products group P1XU / G9D UPFLOW, P1XD / G9D DOWNFLOW/HORIZONTAL Installation Instruction

HIGH ALTITUDE APPLICA TION

INSTALLATION
INSTRUCTION

Supersedes: Nothing 650.78-N2.1V (998)

CONVERSION INSTRUCTION

HIGH EFFICIENCY

DELUXE TWO STAGE FURNACES

035-14460-000

MODELS: P1XU / G9D UPFLOW

P1XD / G9D DOWNFLOW/HORIZONTAL

WARNING: Th is conversion kit is to be installed b y a qualified service agency in accordance with
the manufacturer’s instructions and all applicable codes and requirements of the autho rity having
jurisdiction. If the information in these instructio ns 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 u ntil the operation o f the conver ted appliance is checked
as specified in the manufacturer’s instructions supp lied with the kit.

WARNING: 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ANSI Z223.1-latest edition, unless superseded by local codes. For Canadian installations, the
conversion shall be carried ou t in accordan ce with the r equirem ents of the Provin cial author ities
having jurisdiction and in accord ance with the CAN1-B149.1 and .2 installation codes.

The manufacturer accepts no responsibility for malfunctions due to improper conversi ons.

GENERAL

This instru ction is intend ed for the conv ersion of new eq uip­ment only, for operation at altitudes greater than 2,000 ft.
above sea lev el. Follow th e basic unit in stallation instruction
for all other aspects of the installation.

All unit 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 a nd all o ther
applicable local codes and util ity requirements.

This instruc tion pr ovides th e neces sary infor mation to s elect
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 alti tude pressure switc h and
accessory includes a special switch and other items as de­tailed below.

WARNING: Improper installati on, adjustment serv­ice, or maintenance can cause injury or property
damage; therefore, only a qualified in staller or quali­fied servi ce personnel should perform this conv er­sion.

COMMON P ARTS

Description Part Number Quantity

Conversion Label 035 - 1 1635 - 000 1

Install. Instruction. 035 - 14460 - 000 1

PRESSURE SWITCH

Accessory Kit Switch Part Number Pressure Setting

1PS0315 024-27680 .25 / .75 IWG
1PS0316 024-27681 .30 / .75 IWG
1PS0317 024-27682 .25 / .50 IWG
1PS0318 024-27683 .35 / .80 IWG

PRESSURE SWITCH

All units require a pressure switch change to provide safe and
reliable o peration at altitudes o ver 2,000 ft. Table 1 in dicates
the correct pressure switch accessory for each unit model
applied at two different altitude groupings.

WARNING: Do not adjust the original pressure
switch to allow operation at high altitude. Unsafe
operation will result.

TABLE 1

Upflow/Downflow Models

The high altitude pressure switch should be changed by follow­ing this procedure.

- HIGH AL TITUDE PRESSURE SWITCH U SAGE

Input

(MBH)

60 / 39 55 / 36 1PS0315 1PS0315

80 / 52 74 / 48 1PS0316 1PS0316
100 / 65 93 / 60 1PS0317 1PS0317
120 / 78 112 / 72 1PS0318 1PS0318

CAUTION: The gas supply shall be shut off prior to
disconnectin g the electri cal power , b efore procee ding
with the conversio n.

1. Remove the burner access door.

2. Note the locati on of the wir es on th e right h and pr essur e
control and then di scon nect them . Remo ve the h ose f rom
the pressure control.

Output
(MBH)

2,000 Ft

to 10,000 Ft.

> 2,000

To 10,000 Ft.

650.78-N2.1V

3. Remove the screws securing the pressure control and
remove it from the unit. Check that the new pressure
control part number is correct for your application (refer
to Table 1). Install the new pressure control.

4. Replace the hose and wiring as originally connected.

ORIFICE SIZE SELECTION

A numb er of factors determi ne the correct orifice us age for your
application. These factors include the original orifice sizing,
BTU content of the gas and the altitude.

The standard o rifice us ed in the furna ce is shown in Table 2.
Find your unit and determine the standard orifice provided.

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.

Use the BTU heat ing v alue that is ne arest to your valu e. Read
across the selected table from the standard orifice to the
altitude for your application and the note the new orifice num­ber.

EXAMPLE: If your unit ha s a #45 orifice as stan dard
and a heating gas value of 900 BTU/CU.FT., at an
altitude of 7, 000 feet a #47 orif ice will provide the c orrect
firing rate.

For propane (LP) gas applications, Use Table 4 to select the
proper high altitude orifice s ize.

WARNING: The fu rnace must first b e converted to
use propane (LP) gas throug h the use of the stand ard
propane conversion kit accessory.

TABLE 2

Upflow-Downflow/Horizontal Models

- STANDARD ORIFICE USAGE

Input

(MBH)

60 / 39 55 / 36 # 45 # 55

80 / 52 75 / 48 # 45 # 55
100 / 65 95 / 60 # 45 # 55
120 / 78 112 / 72 # 45 # 55

Output
(MBH)

Natural

Orifice Size

Propane

Orifice Size

After selecting the proper orifice size for your application, see
the listing o n Table 5 that in dicates the par t 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:

1. Carefull y remove the wi res from the gas valve and n ote
their location so they may be properly replaced. Remove
the burner box door. Remove the two screws that hold the
manifold to the burner box 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 burner ori fices in the manifold and
tighten them. Aft er installing a new orific e in each locat ion,
any leftover orifi ce s ma y be dis ca rde d.

TABLE 3

(Manifold Pressure

TABLE 4

(Manifold Pressure

- ALTITUDE/NATURAL GAS HEATING VALUE ORIFICE SECTION

Natural Gas

Heating V al ue

3.5" W.C.)
1200

BTU/CU.FT.

1 100

BTU/CU.FT.

1000

BTU/CU.FT.

900

BTU/CU.FT.

800

BTU/CU.FT.

- ALTITUDE/PROPANE (LP) GAS HEATING VALUE ORIFICE SECTION

Propane Gas

Heating V al ue

10.0" W.C.)

2516

BTU/CU.FT.

Orifice

Shipped

With Unit

45 48 49 49 50 50 50 51 51 52 52
43 45 46 47 47 47 48 48 49 49 49
45 47 48 48 49 49 49 50 50 51 51
43 44 45 45 45 46 47 47 48 48 49
45 45 46 47 47 47 48 48 49 49 50
43 43 44 44 44 45 45 46 47 47 48
45 44 45 45 45 46 47 47 48 48 49
43 42 42 43 43 43 44 44 45 46 47
45 43 44 44 44 45 45 46 47 47 48
43 39 40 41 41 42 42 43 43 44 44

Propane

Orifice @

Sea Level

54 54 54 55 55 55 55 55 56 56 56
55 55 55 55 55 56 56 56 56 56 57
56 56 56 56 57 57 57 58 59 59 60

0 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000

0 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000

Recommended Orifice

Altitude (Ft. Above Sea Level)

Recommended Orifice

Altitude (Ft. Above Sea Level)

2 Unitary Products Group