Reznor UEAS User manual

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Form I-UEAS (Version B)
Obsoletes I-UEAS (Version A)
Installation / Operation / Maintenance
Applies to: Model UEAS,
High-Efciency, Separated-
Combustion, Low-Static
Unit Heater
This booklet includes installation, operation, maintenance, and service information. Before beginning
any procedure, carefully review all information, paying particular attention to the warnings. All installation
procedures must be in compliance with all codes and requirements of authorities having jurisdiction.
Keep this booklet for future reference.
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CQS
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WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in serious injury, death, or
property damage.
Be sure to read and understand the installation, operation, and service instructions in
this manual.
Improper installation, adjustment, alteration, service, or maintenance can cause
serious injury, death, or property damage.
— Do not store or use gasoline or other ammable vapors and liquids in the vicinity
of this or any other appliance.
— 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.
• If you cannot reach your gas supplier, call the re department.
— Installation and service must be performed by a qualied installer, service agency,
or the gas supplier.
Form I-UEAS, P/N 221232 R11, Page 1

1.0 General ............................................... 2
1.1 Hazard Labels and Notices .................2
1.2 General Information.............................3
1.3 Warranty ..............................................3
1.4 Installation Codes ................................3
2.0 Unit Heater Location ........................ 4
3.0 Receiving, Uncrating, and
Preparing for Installation ................. 5
4.0 Dimensions and Clearances ............ 6
4.1 Dimensions..........................................6
4.2 Clearances ..........................................7
5.0 High Altitude Operation .................... 7
6.0 Hanging the Heater............................ 7
7.0 Mechanical ......................................... 8
7.1 Gas Piping and Pressure.....................8
7.2 Venting and Combustion Air .............13
7.3 Condensate Drain System.................26
8.0 Electrical and Wiring ....................... 28
8.1 Electrical Supply ................................28
8.2 24V Control Wiring Connections .......28
8.3 Typical Wiring Diagram......................29
9.0 Controls ............................................ 30
9.1 Thermostat.........................................30
9.2 Gas Valve ..........................................30
9.3 Safety Controls ..................................30
10.0 Ignition System .............................. 31
11.0 Commissioning and Startup ......... 34
11.1 Check the Installation Prior
to Startup .........................................34
11.2 Heater Startup..................................34
11.3 Check Installation After Startup........36
12.0 Maintenance and Service.............. 36
12.1 Maintenance Schedule ....................36
12.2 Maintenance Procedures.................37
12.3 Troubleshooting ..............................43
APPENDIX .............................................. 46
INDEX...................................................... 47
INSTALLATION RECORD ..................... 48
1.1 Hazard Labels and Notices
There are warning labels on the unit and throughout this manual. For your safety,
read the denitions below and comply with all boxes labeled CAUTION, WARN-
ING, and DANGER during installation, operation, maintenance and service of this
heater.
Denitions of Hazard Intensity Levels in this Manual
HAZARD INTENSITY LEVELS
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
Gas-red appliances are not designed for use in
hazardous atmospheres containing ammable vapors or
combustible dust, in atmospheres containing chlorinated
or halogenated hydrocarbons, or in applications with
airborne silicone substances. See Hazard Levels above.
1.0 General
Table of Contents
Form I-UEAS, Page 2

1.2 General
Information
WARNING
Should overheating occur, or the gas supply fail to shut
off, shut off the manual gas valve to the appliance before
shutting off the electrical supply.
WARNING
Do not use this appliance if any part has been under
water. Immediately call a qualied service technician to
inspect the appliance and replace any gas control that
has been under water.
WARNING
Installation should be done by a qualied agency in
accordance with these instructions. The qualied
service agency installing this high efciency separated-
combustion system is responsible for the installation.
1.3 Warranty
Refer to the limited warranty information on the Warranty Form shipped with the
heater.
Warranty is void if ...
a. Wiring is not in accordance with the diagram furnished with the heater.
b. The unit is installed without proper clearance to combustible materials.
c. A fan model is connected to a duct system or if the air delivery system is
modied.
1.4 Installation Codes
These units must be installed in accordance with local building codes. In the
absence of local codes, in the United States, the unit must be installed in accor-
dance with the National Fuel Gas Code, ANSI Z223.1 NFPA 54. A Canadian instal-
lation must be in accordance with the CSA B149 Installation Codes. These codes
Model UEAS high-efciency unit heaters are design certied by ITS for use in
industrial and commercial installations in the United States and Canada. Instruc-
tions in this manual apply only to Model UEAS heaters.
Model UEAS heaters are available for use with either natural or propane gas. The
type of gas, the input rate, and the electrical supply requirement are shown on the
heater rating plate. Check the rating plate to determine if the heater is appropriate
for the intended installation. NOTE: All Model UEAS heaters are factory equipped
for use with natural gas and include a conversion kit for eld conversion for use
with propane.
Model UEAS heaters have a titanium stabilized primary heat exchanger with a
MacroChannel® secondary heat exchanger (patent pending).
CAUTION
Model UEAS unit heaters should not be used in an application
where the heated space temperature is below 50°F. The
combination of low space and combustion air temperatures
may result in condensate freezing in the secondary heat
exchanger and/or condensate drain.
Form I-UEAS, P/N 221232 R11, Page 3

Special Installations
(Aircraft Hangars/
Repair Garages/Parking
Garages)
California Warning Label
Massachusetts
Requirement
1.0 General (cont’d)
FIGURE 1 - Throw for
Fan Model UEAS
Heater Throw
2.0 Unit Heater
Location
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
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
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
NOTE: Throws listed are with
standard adjustable horizontal
louvers at the angles listed
(angle is relative to the top
of the heater). Throw pattern
changes with the addition of
optional vertical louvers and/or
downturn nozzles.
Dimensions X, Y, and Z (feet) Model UEAS with Standard Horizontal Louvers at Mounting Heights of 5 - 18 ft
H
130 180 260 310
X Y Z Louver
Angle* X Y Z Louver Angle* X Y Z Louver Angle* X Y Z Louver Angle*
8 ft 13 24 73 -26° 16 30 93 -20° 15 28 94 -24° 17 31 105 -20°
10 ft 14 24 69 -32° 17 31 91 -25° 16 28 89 -29° 18 32 103 -25°
12 ft 14 24 64 -39° 18 31 88 -30° 17 28 85 -34° 19 32 98 -30°
14 ft 14 22 59 -45° 19 30 84 -34° 17 27 80 -40° 20 32 95 -34°
16 ft 13 20 53 -51° 19 29 79 -39° 17 25 74 -45° 21 31 90 -38°
18 ft 11 17 44 -58° 19 28 74 -44° 16 24 66 -51° 20 30 85 -43°
are available from CSA Information Services, 1-800-463-6727. Local authorities
having jurisdiction should be consulted before installation is made to verify local
codes and installation procedure requirements.
Installations in aircraft hangars should be in accordance with ANSI/NFPA No. 409
(latest edition), Standard for Aircraft Hangars; in public garages in accordance
with ANSI/NFPA No. 88A (latest edition), Standard for Parking Structures; and for
repair garages in accordance with ANSI/NFPA No. 88B (latest edition), Standard
for Repair Garages. In Canada, installations in aircraft hangars should be in accor-
dance with the requirements of the enforcing authorities, and in public garages in
accordance with CSA B149 codes.
If the heater is being installed in the state of California, the installer MUST attach a
warning label on the outside of the access door. Find the California Warning label,
P/N 196977, in the plastic bag with this installation manual. Select a location on the
heater access panel. Be sure the surface is clean and dry and adhere the label.
If the heater is being installed in the Commonwealth of Massachusetts, this unit
must be installed by a licensed plumber or licensed gas tter.
Use the throw data and location information in this section; clearances and dimen-
sions in Paragraph 4; weights and hanging instructions in Paragraph 6; and piping,
venting, and condensate drain requirements in Paragraph 7, to determine where
to suspend the heater. Due to possible condensate freezing in the secondary heat
exchanger and/or condensate drain, this heater should not be used in an applica-
tion where the space temperature of the location is below 50°F.
1.4 Installation Codes (cont’d)
Form I-UEAS, Page 4

Locate the heater so that it is a minimum of ve feet (1.5M) above the oor and in
compliance with the clearances in Paragraph 4.2.
WARNING
Internal heater surfaces that are accessible from outside
the heater will cause burns if touched. Suspend the heater a
minimum of 5 feet (1.5M) above the oor.
For best results, the heater should be placed with certain rules in mind. In general,
a unit should be located from 8 to 12 feet (2.4-3.7M) above the oor. Units should
always be arranged to blow toward or along exposed wall surfaces, if possible.
Where two or more units are installed in the same room, a general scheme of air
circulation should be maintained for best results.
Suspended heaters are most effective when located as close to the working zone
as possible, and this fact should be kept in mind when determining the mounting
heights to be used. However, care should be exercised to avoid directing the dis-
charged air directly on the room occupants.
Partitions, columns, counters, or other obstructions should be taken into consid-
eration when locating the unit heater so that a minimum quantity of airow will be
deected by such obstacles.
When units are located in the center of the space to be heated, the air should be
discharged toward the exposed walls. In large areas, units should be located to
discharge air along exposed walls with extra units provided to discharge air in
toward the center of the area.
At those points where inltration of cold air is excessive, such as at entrance doors
and shipping doors, it is desirable to locate the unit so that it will discharge directly
toward the source of cold air from a distance of 15 to 20 feet (4.6-6.1M).
CAUTION: Do not locate the heater where it may be
exposed to water spray, rain, or dripping water.
The presence of chlorine vapors in the combustion air of gas-red heating equip-
ment presents a potential corrosion hazard. Chlorine found usually in the form
of freon or degreaser vapors, when exposed to ame will precipitate from the
compound, and go into solution with any condensation that is present in the heat
exchanger or associated parts. The result is hydrochloric acid which readily attacks
all metals including 300 grade stainless steel. Care should be taken to separate
these vapors from the combustion process. This may be done by wise location of
the unit vent and combustion air terminals with regard to exhausters or prevailing
wind directions. Chlorine is heavier than air. Keep these facts in mind when deter-
mining installation location of the heater in relation to building exhaust systems.
Location
Recommendations
Dimensions X, Y, and Z (meters) Model UEAS with Standard Horizontal Louvers at Mounting Heights of 1.5 - 5.5M
H
130 180 260 310
X Y Z Louver
Angle* X Y Z Louver Angle* X Y Z Louver Angle* X Y Z Louver Angle*
2.4 M 4 7 22 -26° 5 9 28 -20° 5 9 29 -24° 5 9 32 -20°
3.0 M 4 7 21 -32° 5 9 28 -25° 5 9 27 -29° 6 10 31 -25°
3.7 M 4 7 20 -39° 6 9 27 -30° 5 9 26 -34° 6 10 30 -30°
4.3 M 4 7 18 -45° 6 9 26 -34° 5 8 24 -40° 6 10 29 -34°
4.9 M 4 6 16 -51° 6 9 24 -39° 5 8 23 -45° 6 9 27 -38°
5.5 M 3 5 13 -58° 6 9 23 -44° 5 7 20 -51° 6 9 26 -43°
Hazards of Chlorine
- applies to location of
Model UEAS heater with
regard to combustion air
inlet
3.0 Receiving,
Uncrating, and
Preparing for
Installation
This unit was test operated and inspected at the factory prior to crating and was
in operating condition. If the heater has incurred any damage in shipment, docu-
ment the damage with the transporting agency and contact an authorized Reznor®
Distributor. If you are an authorized Distributor, follow the FOB freight policy proce-
dures as published by Thomas & Betts for Reznor® products.
Form I-UEAS, P/N 221232 R11, Page 5

4.1 Dimensions
4.0 Dimensions and
Clearances
FIGURE 2 - Model UEAS Dimensions
Top View Rear View
Front View Right Side View
A
B
E
FG
H
J
K
M
N
R
P
C
25”
(635mm)
5-5/8” (143mm)
1-9/16” (40mm)
Condensate Drain
4” Vent Connection
Line Voltage Entrance
(connects in sealed electrical box)
6” Combustion
Air Connection
Disconnect Switch
Thermostat
Connection
8-1/4” (210mm)
3-1/4” (83mm)
1-1/4” (32mm)
Four
Suspension
Points
(3/8-16 Female
Thread)
23” (584)
LED Viewport
External Gas Connection
S
Size A B C E F G H J K M N P R S
Dimensions - inches (±1/8 inch)
130, 180 20-1/8 39-3/16 16-1/16 11-15/16 2-3/8 25-11/16 50-1/2 42 13-7/16 8-5/16 4-5/16 5-1/16 6-5/16 1-3/4
260, 310 34-1/8 40-15/16 30-1/16 13-15/16 1-3/8 27-11/16 53-5/16 44 14-7/32 9-3/32 5-1/16 18-15/16 7-3/4 1-3/8
Dimensions - mm (±3 mm)
130, 180 511 995 408 303 60 652 1283 1067 341 211 110 129 160 44
260, 310 867 1039 764 354 35 703 1354 1118 361 231 129 481 197 35
IMPORTANT: Shipping
brackets are attached with
cabinet screws. When
removing shipping brackets,
re-insert ALL screws into the
cabinet.
3.0 Receiving,
Uncrating, and
Preparing for
Installation
(cont’d)
Check the rating plate for the gas specications and electrical characteristics of
the heater to be sure that they are compatible with the gas and electric supplies at
the installation site. A conversion kit is included with the heater for converting for
use with propane; see instructions in Paragraph 7.1.4.
Read this booklet and become familiar with the installation requirements of your
particular heater. If you do not have knowledge of local requirements, check with
the local gas company or any other local agencies who might have requirements
concerning this installation.
Before beginning, make preparations for necessary supplies, tools, and man-
power. Be sure that the vent/combustion air kit (either vertical Option CC2 or hori-
zontal Option CC6) is at the job site.
If the installation includes optional vertical louvers, downturn nozzle, and/or a
hanger kit, install these options before the heater is suspended. Instructions are in
this form or in the option package; option packages are shipped separately.
Other shipped-separate items could include a thermostat bracket kit, a thermostat,
and/or a thermostat guard. Be sure all options ordered are at the installation site.
Form I-UEAS, Page 6

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
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



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



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


 
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FIGURE 3 - Dimension
“T” With Optional
Downturn Nozzle
4.2 Clearances
Clearances
Model UEAS
130, 180, 260,
310
Top Flue Connector Access Panel Non-Access Side Bottom* Rear**
inches mm inches mm inches mm inches mm inches mm inches mm
4 102 6 152 18 457 2 51 1 25 18 457
*Suspend the heater so that the bottom is a minimum of 5 feet (1.5M) above the oor.
** Measure rear clearance from the fan motor.
"T" for UEAS
Size
with Option CD2 with Option CD3 with Option CD4
inches mm inches mm inches mm
130, 180 11-1/2 292 19-7/8 505 14-1/2 368
260, 310 18-1/2 470 32 813 21-1/2 546
Units must be installed so that the clearances in the table are provided for combus-
tion air space, inspection and service, and for proper spacing from combustible
construction. Clearance to combustibles is dened as the minimum distance from
the heater to a surface or object that is necessary to ensure that a surface tem-
perature of 90°F above the surrounding ambient temperature is not exceeded.
If the heater is being installed at an elevation above 2000 ft (610M), the input rate
will have to be derated. This is done by adjusting the valve outlet pressure. Adjust-
ing the valve outlet pressure is done after the heater is in operation; follow the
instructions in Paragraph 7.1.3. Capacities and inputs for derated units are also
listed in Paragraph 7.1.3.
5.0 High Altitude
Operation
6.0 Hanging the
Heater
Before suspending the heater, check the supporting structure to be used to verify
that it has sufcient load-carrying capacity to support the weight of the unit.
Model UEAS - Weight
Size 130 180 260 310
lbs 230 245 360 395
kg 104 111 163 179
WARNING
Unit must be level
for proper operation.
Do not place or add
additional weight
to the suspended
heater. Hazard
Levels, page 2.
WARNING
Check the supporting structure to be used to verify
that it has sufcient load carrying capacity to support
the weight of the unit. Suspend the heater only from the
threaded nut retainers or with a manufacturer provided
kit. Do NOT suspend from the heater cabinet.
When the heater is lifted for suspension, support the bottom of the heater with ply-
wood or other appropriately placed material. If the bottom is not supported, dam-
age could occur. Before hanging, verify that any screws used for holding shipping
brackets were re-installed in the cabinet.
The heater has four-point suspension. Suspension point dimensions are shown in
FIGURE 2, page 6. A 3/8”-16 threaded nut retainer is located at each suspension
point (FIGURE 4A).
Form I-UEAS, P/N 221232 R11, Page 7

FIGURE 4B - Swivel Connectors, Option
CK10, to Suspend the Heater from 1” Pipes
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


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
Be sure the threaded swivel connectors
are locked to the heater as illustrated.
FIGURE 4A - Suspending the Heater with
Rods from the Threaded Nut Retainers
Add a 3/8 nut
and washer to
lock the hanger
rod to the heater.
3/8 threaded rod
(field supplied)
Be sure the threaded hanger rods are
locked to the heater as illustrated. Length
of threaded rod extending into the heater
MUST NOT exceed 1/2” (13mm).
Recommended maximum hanger rod
length is 6 feet (1.8M).
All piping must be in accordance with requirements outlined in the National Fuel
Gas Code ANSI Z223.1/NFPA 54 (latest edition) or CSA-B149.1 and B149.2 (See
Paragraph 2). Gas supply piping installation should conform with good practice
and with local codes. Support gas piping with pipe hangers, metal strapping, or
other suitable material; do not rely on the heater to support the gas pipe.
The heater is oriced for operation with natural gas having a heating value of 1000
(± 50) BTU per cubic ft or propane gas with a heating value of 2500 (± 100) BTU
per cubic ft. If the gas at the installation does not meet these specications, con-
sult the factory for proper oricing.
Pipe joint compounds (pipe dope) shall be resistant to the action of liqueed petro-
leum gas or any other chemical constituents of the gas being supplied.
7.0 Mechanical
7.1 Gas Piping and
Pressure
7.1.1 Gas Supply
WARNING
This appliance is equipped for a maximum gas supply
pressure of 1/2 psi, 3.5 kPa, or 14 inches water column.
Supply pressure greater than 1/2 psi requires installation
of an additional lockup-type service regulator external to
the unit.
WARNING: PRESSURE TESTING SUPPLY PIPING
Test Pressures Above 1/2 PSI: Disconnect the heater and
manual valve from the gas supply line which is to be tested.
Cap or plug the supply line.
Test Pressures Below 1/2 PSI: Before testing, close the manual
valve on the heater.
If ordered with swivel connectors, Option CK10, for 1” pipe attach the swivels at
the threaded nut retainers. Suspend with 1” pipes (FIGURE 4B).
6.0 Hanging the
Heater (cont’d)
Form I-UEAS, Page 8

Sizing Gas Supply Line
Capacity of Piping
Cubic Feet per Hour based on 0.3" w.c. Pressure Drop
Specic Gravity for Natural Gas -- 0.6 (Natural Gas -- 1000 BTU/Cubic Ft)
Specic Gravity for Propane Gas -- 1.6 (Propane Gas -- 2550 BTU/Cubic Ft)
Length Diameter of Pipe
of 1/2" 3/4" 1" 1-1/4" 1-1/2" 2"
Pipe Natural Propane Natural Propane Natural Propane Natural Propane Natural Propane Natural Propane
20' 92 56 190 116 350 214 730 445 1100 671 2100 1281
30' 73 45 152 93 285 174 590 360 890 543 1650 1007
40' 63 38 130 79 245 149 500 305 760 464 1450 885
50' 56 34 115 70 215 131 440 268 670 409 1270 775
60' 50 31 105 64 195 119 400 244 610 372 1105 674
70' 46 28 96 59 180 110 370 226 560 342 1050 641
80' 43 26 90 55 170 104 350 214 530 323 990 604
90' 40 24 84 51 160 98 320 195 490 299 930 567
100' 38 23 79 48 150 92 305 186 460 281 870 531
125' 34 21 72 44 130 79 275 168 410 250 780 476
150' 31 19 64 39 120 73 250 153 380 232 710 433
175' 28 17 59 36 110 67 225 137 350 214 650 397
200' 26 16 55 34 100 61 210 128 320 195 610 372
Note: When sizing supply lines, consider possibilities of future expansion and increased requirements.
Refer to National Fuel Gas Code for additional information on line sizing.
FIGURE 5 - Gas
connection is at the
pipe nipple that extends
outside the cabinet
Illustration shows
both a vertical and
horizontal gas supply;
requirements are the
same.
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
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
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
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 
7.1.2 Gas Connection
Leak-test all connections by brushing on a leak-detecting solution.
WARNING
All components of a gas supply system must be leak
tested prior to placing equipment in service. NEVER TEST
FOR LEAKS WITH AN OPEN FLAME. Failure to comply
could result in personal injury, property damage or death.
Gas Connection
Size inches
130, 180 1/2
260, 310 3/4
Install a ground joint union and a manual shutoff valve upstream of the unit control
system as shown in FIGURE 5. Installation of a trap with a minimum 3” (76mm)
drip leg is required. he unit is equipped with a nipple that extends outside the cabi-
net. The gas connection is either 1/2” or 3/4”.
Form I-UEAS, P/N 221232 R11, Page 9

7.1.3 Valve Outlet or Orice Pressure Setting
Measuring valve outlet gas pressure cannot be done until the heater is in opera-
tion. It is included in the steps of the “Check-Test-Start” procedure in Paragraph
11. The following warnings and instructions apply.
WARNING
Valve outlet gas pressure must never exceed 3.5” w.c.
for natural gas and 10” w.c. for propane gas.
For Natural Gas:When the heater leaves the factory, the combination
gas valve is set so that the valve outlet gas pressure for a single-stage
valve is regulated to 3.5” w.c. Inlet supply pressure to the valve for natural
gas must be a minimum of 5” w.c. or as noted on the rating plate and a
maximum of 14” w.c.
For Propane: The heater is shipped factory equipped for use with natural gas. A
propane conversion kit is included. Follow the instructions in Paragraph 7.1.4 to
convert for use with propane.
At startup, measure the valve outlet pressure. Refer to the pressure chart on page
11 for correct outlet pressure.
When using propane, the inlet supply pressure to the valve must be a minimum of
11” w.c. and a maximum of 14” w.c.
Before attempting to measure or adjust valve outlet gas pressure, the inlet supply
pressure must be within the specied range both when the heater is in operation
and on standby. Incorrect inlet pressure could cause excessive valve outlet gas
pressure immediately or at some future time. If natural gas supply pressure is too
high, install a regulator in the supply line before it reaches the heater. If natural gas
supply pressure is too low, contact your gas supplier.
NOTE: A gas conversion kit for
changing from natural gas to
propane is included with each
heater. See Paragraph 7.1.4 for
conversion instructions.
7.0 Mechanical
(cont’d)
7.1 Gas Piping and
Pressure (cont’d)
Instructions
1) Locate the 1/8” output pressure tap on the valve (See FIGURE 6, page 11).
With the manual valve turned off to prevent ow to the gas valve, connect
a manometer to the 1/8” pipe outlet pressure tap in the valve. NOTE: A
manometer (uid-lled gauge) is recommended rather than a spring type
gauge due to the difculty of maintaining calibration of a spring type gauge.
2) Open the manual valve and operate the heater. Depress and hold the door
safety switch. Cycle the burner once or twice to properly seat the adjustment
spring in the valve. Measure the outlet pressure of the gas valve.
Normally when operating on natural gas at sea level, adjustments should
not be necessary to the factory setting. (For high altitude settings, see next
paragraph.)
If adjustment is necessary, remove the cap from the adjustment screw(s). Set
pressure to correct settings by turning the regulator screw IN (clockwise) to
increase pressure. Turn regulator screw OUT (counterclockwise) to decrease
pressure.
CAUTION: DO NOT bottom out the gas valve regulator
adjusting screw. This can result in unregulated manifold
pressure causing excess overre and heat exchanger
failure.
Check Valve Outlet
Pressure (can only be
done after heater is
operating)
NOTE: If operating at high alti-
tude, outlet pressure requires
adjustment. Follow instructions
below.
Derate by Valve Outlet
Pressure Adjustment for
High Altitude Operation
Instructions for High Altitude Derate
1. Determine the required valve outlet pressure for the elevation where the
heater will be operating. If unsure of the elevation, contact the local gas
supplier.
Form I-UEAS, Page 10

Altitude Natural Gas Propane
Feet Meters inches w.c.
Manifold Pressure Settings by Altitude for the UNITED STATES
0-2000 0-610 3.5 10.0
2001-3000 611-915 3.1 8.8
3001-4000 916-1220 3.0 8.5
4001-5000 1221-1525 2.8 8.1
5001-6000 1526-1830 2.7 7.7
6001-7000 1831-2135 2.6 7.4
7001-8000 2136-2440 2.5 7.1
8001-9000 2441-2745 2.4 6.7
9001-10000 2746-3045 2.2 6.4
Manifold Pressure Settings by Altitude for CANADA
0-2000 0-610 3.5 10.0
2001-4500 611-1373 2.8 8.1
2. Locate the 1/8” output pressure tap on the valve (See FIGURE 6). Turn the
switch or knob 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.
NOTE: This adjustment can
only be done after the heater
is in operation. High altitude
adjustment is included in the
startup procedures.
Valve Outlet Pressure
Settings by Elevation
3. Turn the switch or knob on the top of the valve to “ON”. Remove the cap
from the output pressure adjusting screw and adjust the gas train pressure
to the pressure selected from the table above. Adjust pressure by turning the
regulator screw IN (clockwise) to increase pressure or OUT (counterclockwise)
to decrease pressure.
4. Turn up the thermostat. Depress and hold the door safety switch. Cycle the
burner once or twice to properly seat the adjustment spring in the valve.
Re-check the pressure. When the outlet pressure is right for the installation,
remove the manometer and replace the cap.
Check for leak at the pressure tap tting.
5. With the heater operating determine that the inlet pressure to the heater for
natural gas is between 5 and 13.5 inches w.c. and for propane between 10
and 13.5 inches w.c. Take this reading as close as possible to the heater
(Heaters are equipped with gas valves that have an inlet pressure tap.) If the
inlet pressure is not within the specied range, the inlet pressure must be
corrected and Steps 3 and 4 repeated.
6. Find the High Altitude Adjustment label, P/N 197062, in the plastic bag with
this installation manual. Using a permanent marker, ll-in the appropriate
information from the tables below. Select a location for the label on the outside
of the heater access panel 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.
The input and/or the capacity of the heater changes with the derate. The tables
below (page 12) list inputs and capacities at altitudes from sea level to 10,000 ft
(3045M).
FIGURE 6 - Top
View of Valve
showing Outlet
Pressure Tap
and Adjustment
Locations
1/8”
Output
Pressure
Tap
Inlet
Pressure Tap
Output
Adjustment
Screw
Valve - UEAS 260 & 310
Valve - UEAS 130 & 180
1/8”
Outlet
Pressure
Tap
Inlet
Pressure
Tap
Adjust Outlet
Pressure
Form I-UEAS, P/N 221232 R11, Page 11

7.1 Gas Piping and
Pressure (cont’d) High Altitude Capacity Changes
7.1.4 Converting from
Natural Gas to Propane
Natural to Propane
Conversion Kits
Size 130 180 260 310
P/N 261647 261648 221444 221445
Components:
Regulator Spring Kit
*for Serial No. Valve Code
260605, M/H #396221 98720, M/H #393691
6E Y3 or Z8
Burner Orice P/N 120145 221265 196902 196903
Size 3.3mm #25 #14 #8
Conversion Tape 64391
Propane Gas Disk 37752
Regulated Propane Label 79718
Find the propane conversion parts in the plastic bag with this installation manual.
Verify the components with the list below and follow the instructions to install.
Conversion Instructions 1. Install the propane spring regulator kit in the gas valve. Follow the valve
manufacturer’s instructions that are included with the spring conversion kit.
2. Attach the propane disk near the gas valve.
3. Install the propane orice. Refer to FIGURE 28, page 39, and locate the gas
orice. Carefully remove the natural gas orice supplied on the heater. Install
the propane orice.
4. 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 afx the
conversion tape and propane label to the heater.
5. During heater startup, follow the instructions in Paragraph 7.1.3 to check the
valve outlet pressure.
7.1.3 Valve Outlet or Orice Pressure Setting (cont’d)
Instructions for High Altitude Derate (cont’d)
BTUH Inputs and Capacities by Altitude in CANADA for Model UEAS
ALTITUDE Normal
Input
Thermal Output
Capacity
Normal
Input
Thermal Output
Capacity
Normal
Input
Thermal Output
Capacity
Normal
Input
Thermal Output
Capacity
Feet Meters Size 130 Size 180 Size 260 Size 310
0-2000 0-610 131,000 121,830 175,000 159,250 260,000 239,200 305,000 277,550
2001-4500 611-1373 117,900 109,647 157,500 143,325 234,000 215,280 274,500 249,795
7.0 Mechanical
(cont’d)
* The Serial No. is on the unit
rating plate. The valve code “Z8”
is identied in the sample serial
number below:
BLC 79 Z8 N 0000
BTUH Inputs and Capacities by Altitude in the UNITED STATES for Model UEAS
ALTITUDE Normal
Input
Thermal Output
Capacity
Normal
Input
Thermal Output
Capacity
Normal
Input
Thermal Output
Capacity
Normal
Input
Thermal Output
Capacity
Feet Meters Size 130 Size 180 Size 260 Size 310
0-2000 0-610 131,000 121,830 175,000 159,250 260,000 239,200 305,000 277,550
2001-3000 611-915 123,140 114,520 164,500 149,695 244,400 224,848 286,700 260,897
3001-4000 916-1220 120,520 112,084 161,000 146,510 239,200 220,064 280,600 255,346
4001-5000 1221-1525 117,900 109,647 157,500 143,325 234,000 215,280 274,500 249,795
5001-6000 1526-1830 115,280 107,210 154,000 140,140 228,800 210,496 268,400 244,244
6001-7000 1831-2135 112,660 104,774 150,500 136,955 223,600 205,712 262,300 238,693
7001-8000 2136-2440 110,040 102,337 147,000 133,770 218,400 200,928 256,200 233,142
8001-9000 2441-2745 107,420 99,901 143,500 130,585 213,200 196,144 250,100 227,591
9001-10000 2746-3045 104,800 97,464 140,000 127,400 208,000 191,360 244,000 222,040
Form I-UEAS, Page 12

7.2 Venting and
Combustion Air
All separated combustion units MUST BE equipped with both combustion air and
exhaust piping to the outdoors. The unique concentric adapter box required with
this heater allows for both combustion air and exhaust piping with only one hori-
zontal or vertical penetration hole in the building.
Concentric horizontal and vertical vent/combustion air systems (Option CC6 or
Option CC2) are the only venting/combustion air systems approved for high ef-
ciency Model UEAS separated-combustion unit heaters.
Model UEAS units are certied as Category IV heaters. These heaters are very
thermal efcient and will produce condensate during operation. The heater and
its venting system must be connected to a drain. See Paragraph 7.3, page 26, for
instructions on installing the condensate drain.
7.2.1.1 Types of Pipe
Provide eld-supplied pipe in the types listed.
Vent Pipe - Schedule 40 PVC or CPVC pipe. In Canada, all PVC vent pipe must
be approved to ULC 636.
Combustion Air Inlet Pipe - Sealed, single-wall galvanized pipe is recommended
for the combustion air pipe.
7.2.1 Vent/Combustion
Air System
Requirements
FIGURE 7 - Rear of a
Model UEAS Heater
showing the Locations
of Both Inlet Air
and Venter Outlet
Connections
Line Voltage Entrance
Gas Connection
(External)
6” dia Collar for
Combustion Air Pipe
Condensate Drain (1/2” PVC pipe)
4” PVC Vent Pipe (See vent conden-
sate drain requirements in FIGURE
8A, 8B, 9A ,or 9B and PVC joint
requirements in Paragraph 7.2.1.6.)
24V Terminal Strip
3-1/4” (83mm)
8-1/4” (210mm)
Sizes 130, 180; 4-5/16”(110mm)
Sizes 260, 310; 5-1/16”(129mm)
Sizes 130, 180;
8-5/16”(211mm)
Sizes 260, 310;
9-3/32”(231mm)
Rear View of Model UEAS
Disconnect Switch
7.2.1.2 Venter Outlet and
Combustion Air Inlet
7.2.1.3 Vent Condensate
Drain Connection
A condensate drain is required in the vent pipe. See FIGURES 8A and 8B for
vertical vent or FIGURES 9A and 9B for horizontal vent run with either horizon-
tal or vertical vent. For Canadian installation, refer to FIGURE 8B or 9B only. In
Canada, all PVC vent pipe must be approved to ULC S636.
The 4” PVC cap with drain connection opening shown in FIGURES 8A and 9A
is supplied with every heater. The drain connection, drain piping, and 4x4x4 PVC
vent pipe tee are eld supplied. All of the vent and drain components shown in
FIGURES 8B and 9B are eld supplied.
See Paragraph 7.2.1.6, page 15, for making vent pipe joints.
The vent pipe drain connects into the heater condensate drain. Refer to Para-
graph 7.3, page 26, for condensate drain installation instructions.
Form I-UEAS, P/N 221232 R11, Page 13

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
FIGURE 9A - U.S.
INSTALLATION
ONLY -
Horizontal or
Vertical Vent
showing Where
to Install the
Condensate
Drain
Connection in
the Horizontal
Vent Run using
factory-provided
4” PVC Cap
7.2 Venting and Combustion Air (cont’d)
7.2.1 Vent/Combustion Air Requirements (cont’d)
12” (305mm)
minimum
24” (610mm)
maximum
Installer-provided 4” Coupling
Slope downward away from
the heater.
Model
UEAS
Field-supplied Fittings as
needed for 1/2” or larger
condensate drain line
Both the vent condensate drain and the heat exchanger condensate drain require a trap and
must go into a sanitary drain. (See Paragraph 7.3, page 26, for requirements on installing
the condensate drain.) All vent and drain parts in this illustration are field supplied.
THIS PVC PIPING ARRANGEMENT APPLIES TO ALL
CANADIAN INSTALLATIONS. In Canada, all PVC vent pipe must
be approved to ULC S636. All PVC venting and drain parts in
this illustration are field supplied. This is an acceptable alternate
PVC piping arrangement for installations in the United States.
4”diameter pipe
FIGURE 8B -
CANADIAN
OR U.S.
INSTALLATION
Vertical Vent
showing Where
to Install the
Condensate
Drain
Connection
FIGURE 8A - U.S.
INSTALLATION
ONLY - Vertical
Vent showing
Where to Install
the Condensate
Drain
Connection
using factory-
provided 4”
PVC Cap
7.0 Mechanical
(cont’d)
Form I-UEAS, Page 14

Model
UEAS Attach installer-provided PVC tee
to the 4” vent pipe outlet.
Balance of the vent may be either
horizontal or vertical. Slope a
horizontal run downward slightly
toward the vent condensate drain
at the heater.
Field-supplied Fittings
as needed for 1/2” or
larger condensate drain
Both the vent condensate drain and the heat exchanger condensate drain require a trap and must go
into a sanitary drain. (See Paragraph 7.3, page 26, for requirements on installing the condensate drain.)
All vent and drain parts in this illustration are field supplied.
THIS PVC PIPING ARRANGEMENT APPLIES TO ALL
CANADIAN INSTALLATIONS. In Canada, all PVC vent pipe must
be approved to ULC S636. All venting and drain parts in this
illustration are field supplied. This is an acceptable
alternate PVC piping arrangement for installations
in the United States.
FIGURE 9B -
CANADIAN
OR U.S.
INSTALLATION
Horizontal or
Vertical Vent
showing Where
to Install the
Condensate
Drain
Connection in
the Horizontal
Vent Run
7.2.1.5 Combustion
Air Pipe Diameter and
Length
• Minimum length of pipe between the heater and the concentric adapter
box is 3 ft (914mm). The minimum/maximum requirements of the length
of vent pipe that extends outdoors are different for horizontal and vertical
vent terminals. See instructions for Option CC2 or Option CC6.
Diameter and Length of the Combustion Air Inlet Pipe
Model UEAS 130, 180, 260, 310 Diameter Length
Section From Heater to Concentric
Adapter Box
6" Same as Vent Pipe
(152mm)
Section From Concentric Adapter
Box to Outdoors
8" See Instructions for Option CC2,
pages 22-25, or CC6, pages 19-22.
(203mm)
Vent Pipe Diameter and Maximum Vent Pipe Length from Heater to
Terminal End for Vertical and Horizontal Vent
Model
UEAS
Vent Pipe
Diameter
Maximum Vent
Pipe Length
Equivalent Straight Length for a
90° Sweep Elbow* 45° Elbow
inches mm feet M feet M feet M
130, 180,
260, 310
4 102 50 15.2 8 2.4 4 1.2
*All 90° elbows in the vent system must be sweep type.
7.2.1.4 Vent Pipe
Diameter and Length
7.2.1.6 Joints Provide pipes and ttings in type specied in Paragraph 7.2.1.1, page 13. When
ready to install the vent system, follow the instructions below to make joints.
Vent Pipe
Combustion Air Pipe Secure slip-t joints of single-wall combustion air pipe with sheetmetal screws or
rivets. Seal joints and seams with aluminium tape or silicone sealant.
The Schedule 40 PVC or CPVC vent system should be installed in a manner
consistent with normal industry standards and in compliance with all local re and
building code requirements. Failure to follow proper installation practices, proce-
dures, or techniques can result in system failure, property damage, or personal
injury. The installer is responsible for the installation. Read all of the procedures
below before beginning installation. Make joints one at a time as pipe and tting
should be assembled quickly while cement is uid.
1. Cut the pipe square. An angled cut may result in joint failure.
Remove burrs using a deburring tool, a le, or a knife edge. Remove
all burrs from the inside and outside diameter of the cut end of the pipe.
Chamfer (bevel) the end of the pipe 10° to 15°.
b) Use a clean dry cloth to remove surface dirt, grease, and moisture from the
pipe sections and ttings.
Form I-UEAS, P/N 221232 R11, Page 15

7.2.1.7 Support
7.2 Venting and
Combustion Air
(cont’d)
7.2.1 Vent/Combustion
Air System
Requirements (cont’d)
2. Check for Proper Fit
With light pressure, test the t. A dry pipe should go one-half to one-third of the
way into the tting hub. Do not use pipe or ttings that are too tight or too loose.
3. Primer, Cement, and Applicator Requirements
a) Primer for joints should conform to ASTM F 656.
b) Cement for joints should conform to ASTM D 2564.
c) Use a 2-3” applicator brush for the 4” pipe and ttings.
4. Applying Primer and Cement (NOTE: Make joints one at a time as pipe and
tting should be assembled quickly while cement is uid.)
a) Apply primer to pipe and tting surfaces. Do not allow primer to puddle
inside the system.
b) Apply a rst coat of cement on the pipe O.D. Apply a full even layer of
cement for a distance slightly greater than the depth of the socket of the
coupler (tting).
c) Coat the coupler (tting) socket with a medium layer of cement, avoiding
puddling inside the system.
d) Apply a second full even layer of cement on the pipe O.D.
5. Join Pipe and Coupler (tting)
Assemble pieces quickly while cement is uid. Insert the pipe into the coupler
(tting) until it touches the socket bottom. Turn the pipe a quarter turn. Hold the
joint together until the pipe will not pull out.
Clean excessive cement from the exterior. A properly made joint will have a
continuous bead of cement around the perimeter.
Vent Pipe Support - For continued safe operation, the vent system must be prop-
erly supported. A ten-foot (3M) length of PVC pipe weighs 20 pounds (9kg) and
has an expansion rate of four times that of metal pipe.
Horizontal CPVC or PVC vent must be supported every six feet (1.8M). The hang-
ers should provide as much bearing surface as possible and must be free of sharp
edges and burrs. Hangers must allow the pipe to expand laterally. Consider pipe
expansion when placing hangers. Changes in pipe direction will allow for expan-
sion. Hangers must be placed to allow for some direction movement. The slip joint
at the concentric adapter is designed to permit some limited expansion. DO NOT
USE THE HEATER OR CONCENTRIC ADAPTER BOX TO PROVIDE VENT PIPE
SUPPORT.
For a vertical CPVC or PVC vent, it is recommended that an engineer design the
vertical support system. An acceptable support for a simple vertical vent that is 30
feet (9.1M) or less and rises closely from the heater is illustrated in FIGURE 10.
DO NOT USE THE HEATER OR CONCENTRIC ADAPTER TO PROVIDE VENT
PIPE SUPPORT.
FIGURE 10 - To allow for
expansion, use a eld-
supplied cradle-type
vent pipe support
Cradle Support
3 to 6 inches
(76 to 152mm)
Maximum length 6 ft (1.8M) for single support
3/8” threaded rod
attached to building
structural member
Vertical single-wall
combustion air pipe may be
supported by the heater and
the concentric adapter box.
Model
UEAS
Vertical Vent
Sweep-type
elbow only
Slope a horizontal run downward slightly
toward the vent condensate drain at the heater.
7.0 Mechanical
(cont’d)
7.2.1.6 Joints (cont’d)
Form I-UEAS, Page 16

Combustion Air Pipe Support - Support a single-wall metal horizontal combus-
tion air run every six feet (1.8M). Support a vertical single-wall metal combustion
air pipe in accordance with accepted industry practices. The heater and concentric
adapter box may be used to support a vertical combustion air pipe.
7.2.1.8 Vent Pipe
Clearance
Vent Pipe - Do not install the vent piping near any high temperature steam lines,
radiant heaters, or other sources of heat.
7.2.1.9 Concentric
Adapter Box
All Model UEAS installations require a concentric adapter box as illustrated in FIG-
URES 11, 12, 13, and 14. The concentric adapter box is included in both the hori-
zontal and vertical vent/combustion air kits. Installation is included in the Option
CC6 and Option CC2 instructions.
FIGURE 11 - A Concentric Adapter
Box is a Required Part of all Model
UEAS Installations
A vent/combustion air kit which
includes the concentric adapter box is
ordered with the heater. A horizontal
terminal vent/combustion air kit is
Option CC6; a vertical terminal vent/
combustion air kit is Option CC2.
Heater Side
View
of the
Concentric
Adapter Box
FIGURE 12 - Concentric
Adapter Box Dimensions
1-7/8”
(48mm)
6-3/16”
(157mm)
2”
(51mm)
9-11/32” (237mm)
5-11/23”
(136mm)
8” diameter Collar for
Combustion Air Pipe
6” diameter Collar for
Combustion Air Pipe
6” diameter Collar for
Combustion Air Pipe
14-3/8”
(365mm)
4-3/32”
(104mm)
5-9/32”
(134mm)
6-1/8”
(156mm)
6-1/8”
(156mm)
1-1/16” (27mm)
16” (406mm)
17” (432mm)
Opening for 4”
diameter Vent Pipe
Silicone
Ring
Top
View
Heater
Side
View
Form I-UEAS, P/N 221232 R11, Page 17

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FIGURE 13 - Concentric Adapter Box Airow
FIGURE 14 - Concentric
Adapter Box
Connections
Concentric Adapter
Box Connections
for a Model UEAS
High Efficiency Heater

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
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



Silicone
Sealing
Ring
7.2.1 Vent/Combustion Air System Requirements (cont’d)
7.2 Venting and Combustion Air (cont’d)
FIGURE 15 - Is
the Separated-
Combustion Vent/
Combustion Air
System Horizontal
or Vertical?
HORIZONTAL OR VERTICAL VENT TERMINAL?
Vertical,
Option CC2,
instructions
begin on
page 22.
Horizontal,
Option CC6,
instructions
begin on
page 19.
7.0 Mechanical
(cont’d)
Form I-UEAS, Page 18

7.2.2 HORIZONTAL VENT
TERMINAL Installation
- Option CC6
Components Required - Factory and Field
Parts in the Horizontal
Vent/Combustion Air
Terminal Package
(Option CC6)
Complete Horizontal Vent/Combustion Air Terminal Kit (Same as Option
CC6), P/N 221247
Qty P/N Description
1221069 Concentric Adapter Box with Silicone Sealing Ring (See
Paragraph 7.2.1.9, pages 17-18.)
1221089 Bird Screen for Exhaust Outlet
1124940 Ring Guard for Air Inlet
437661 #10-16x1/2" lg Screws to attach the inlet air guard
4221186 Spacers for inlet air guard
1221091 4" PVC Cap for Vent Condensate Drain Connection (See
FIGURE 8A and 9A on page 14.)
Field-supplied
requirements:
• Vent pipes and ttings as illustrated in FIGURE 8A, 8B, 9A or 9B on pages 14
and 15 and an elbow (22.5° elbow if available) as shown in FIGURE 16, page
21
• Combustion air pipes (6” and 8” single-wall galvanized pipe)
• Flashing
• Sheetmetal screws, tape, primer, cement, and sealant as required
Before beginning, verify that the kit is at the site and that all components are
correct for the installation. Be sure all required eld-supplied parts are available.
Installation Instructions
for Horizontal Vent/
Combustion Air Kit
Option CC6
(in compliance with
requirements on
pages 13-18)
1. Determine the location on the outside wall for the vent/combustion air
terminal. Location must comply with vent length requirement in Paragraph
7.2.1.4 on page 15. Also, read the “Hazards of Chlorine” on page 5 concerning
location of the combustion air inlet.
In most applications, the terminal will be on approximately the same level as the
heater. Allow for 1/4” per foot (6mm per 305mm) downward pitch of the vent
pipe from the concentric adapter toward the heater for condensate to drain.
Minimum clearances for the horizontal vent terminal are shown in the table on
page 20. Avoid positioning the vent terminal above a walkway as there may be
a small amount of condensate that drips from the end of the vent/combustion air
terminal. In cold climates, the condensate may form icicles. Also, select a location
that complies with adjoining building clearances as shown in FIGURE 16, page
21.
Products of combustion can cause discoloring of some building nishes and
deterioration of masonry materials. Applying a clear silicone sealant that is nor-
mally used to protect concrete driveways can protect masonry materials. If discol-
oration is an esthetic problem, re-locate the vent or install a vertical vent.
WARNING
All vent terminals must be positioned or located away
from fresh air intakes, doors and windows to preclude
combustion products from entering occupied space.
Failure to comply could result in severe personal injury
or death and/or property damage.
WARNING
In climates with below freezing temperatures, condensate may form icicles on the
vent terminal. Locate the terminal where a falling icicle would not be a hazard.
Form I-UEAS, P/N 221232 R11, Page 19

Clearances to Horizontal Vent Terminal
Structure
Minimum Clearances for Vent
Terminal Location (all directions
unless specied)
Forced air inlet within 10 ft (3.1M)* 3 ft (0.9M) above
Combustion air inlet of another appliance 6 ft (1.8M)
Door, window, or gravity air inlet (any building opening)
4 ft (1.2M) horizontally
4 ft (1.2M) below
1 ft (305mm) above
Electric meter, gas meter ** and relief equipment U.S. - 4 ft (1.2M) horizontally
Canada - 6 ft (1.8M)
Gas regulator ** 3 ft (0.9M) horizontally
Adjoining building or parapet 6 ft (1.8M)
Adjacent public walkways 7 ft (2.1M) above
Grade (ground level) 3 ft (0.9M) above***
*Does not apply to the inlet of a direct vent appliance. **Do not terminate the vent directly above
a gas meter or service regulator. *** Consider local snow depth conditions. The vent must be at
least 6” (152mm) higher than anticipated snow depth.
2. Install the vent pipe and combustion air pipe runs (from the heater to
near the location selected through the wall).
• Use the type of pipe specied in Paragraph 7.2.1.1, page 13.
• Comply with the requirements in Paragraph 7.2.1.2 and 7.2.1.3, pages
13-14, when attaching pipes to the heater and installing the condensate drain
connection in the vent.
• Overall vent length must comply with the table in Paragraph 7.2.1.4, page 15.
• Make all joints according to the instructions in Paragraph 7.2.1.6, pages 15-16.
Extend the runs close to the wall location selected in Step 1 above. Provide
1/4” per foot (6mm per 305mm) downward pitch of the vent pipe toward the
heater for condensate to drain (NOTE: The vent pipe will extend through the
wall after the concentric adapter box is installed. The indoor combustion air
pipe will end at the concentric adapter box.)
• Support pipes as required in Paragraph 7.2.1.7, page 17.
3. Prepare a 9” diameter clearance hole through the outside wall for the 8”
diameter combustion air pipe.
Outside wall construction thickness should be 1” (25mm) minimum and 48”
(1219mm) maximum. Position the box against the wall. Being sure that the loca-
tion and box orientation are correct, mark the location where the combustion air
pipe will extend through the wall. Cut a 9” diameter hole so that the 8” pipe will be
centered through the 9” opening.
4. Prepare the concentric adapter box.
4a) Determine the length of the 8” diameter combustion air pipe and attach
it to the box.
Comply with the requirements in FIGURE 16. Determine the length of the pipe
by measuring the wall thickness, plus 4 to 16” (102-406 mm) beyond the wall,
minus the width of the pipe crimp which will be cut off.
So that the 8” inlet air guard will t properly, cut the crimp off the end of the com-
bustion air pipe. Turn the combustion air pipe so that the seam will be toward the
top side of the box and slide it on the collar. Attach the combustion air pipe to the
collar with sheetmetal screws. Seal the joint and seam with sealant or tape.
4b) Drill a drain hole. On the bottom side of the pipe, mark a location that will be
outside between the end of pipe and the building (about 2/3 of the distance from
the end of the pipe to the edge of the building) when the box is installed. Drill a
1/2” diameter drain hole in the pipe at that location.
4c) Attach the inlet air guard. Position the inlet air ring guard over the end of
the combustion air pipe. See FIGURE 16. Attach the guard to the inlet air pipe
with the four 1/2” long screws provided.
7.2.2 HORIZONTAL VENT
TERMINAL Installation -
Option CC6 (cont’d)
7.2 Venting and
Combustion Air
(cont’d)
7.0 Mechanical
(cont’d)
Form I-UEAS, Page 20