Reznor UEAS Instruction manual

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Form I-UEAS (Version A)
Obsoletes Form I-UEAS
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
CQS
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.
Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s
instructions.
If you cannot reach your gas supplier, call your re department.
FOR YOUR SAFETY
Do not store or use gasoline or other ammable vapors and liquids in the vicinity
of this or any other appliance.
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.
•
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Form I-UEAS, P/N 221232 R6, Page 1

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 CAU-
TION, WARNING, and DANGER during installation, operation, mainte-
nance 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. General
Table of Contents
1. General........................2 - 4
1.1 Hazard Labels and Notices . . . . . . . . . . . .2
1.2 General Information . . . . . . . . . . . . . . . . . .3
1.3Warranty...........................3
2. Unit Heater Location . . . . . . . . . . . .4 - 6
1.4 Installation Codes. . . . . . . . . . . . . . . . . . . .4
3. Receiving, Uncrating, and Preparing
for Installation ..................6
4. Clearances and Dimensions . . . . . .6 - 7
4.1Clearances.........................6
4.2Dimensions ........................7
5. High Altitude Operation . . . . . . . . . . . . 8
6. Hanging the Heater ................8
7. Mechanical....................9 - 29
7.1 Gas Piping and Pressure . . . . . . . . . . . . . .9
7.2 Venting and Combustion Air . . . . . . . . . .13
7.3 Condensate Drain System . . . . . . . . . . . .28
8. Electrical and Wiring. . . . . . . . . . .30 - 31
8.1 Electrical Supply. . . . . . . . . . . . . . . . . . . .30
8.2 24V Control Wiring Connections . . . . . . .30
8.3 Typical Wiring Diagram . . . . . . . . . . . . . .31
9. Controls.....................32 - 34
9.1Thermostat........................32
9.2GasValve.........................32
9.3SafetyControls.....................32
10. Ignition System . . . . . . . . . . . . . .34 - 37
11. Operation...................37 - 39
11.1 Check the Installation Prior to Startup . .37
11.2 Heater Startup . . . . . . . . . . . . . . . . . . . .38
11.3 Check Installation After Startup . . . . . . .39
12. Maintenance and Service . . . . . .40 - 49
12.1 Maintenance Schedule. . . . . . . . . . . . . .40
12.2 Maintenance Procedures . . . . . . . . . . . .40
12.3 Troubleshooting . . . . . . . . . . . . . . . . . . .47
APPENDIX ........................50
TechnicalData........................50
Operating Principle. . . . . . . . . . . . . . . . . . . . .50
INDEX............................51
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 sys-
tem is modied.
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.
Instructions 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 MacroChanne® 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 R6, Page 3

Special Installations
(Aircraft Hangars/
Repair Garages/Parking
Garages)
California Warning Label
Massachusetts
Requirement
1. General (cont’d)
FIGURE 1 - Throw for
Fan Model UEAS
Heater Throw
2. Unit Heater
Location





 




NOTE: Throws listed are
with standard adjustable
horizontal louvers at the
angles listed (angle is rela-
tive to the top of the heater).
Throw pattern changes with
the addition of optional verti-
cal louvers and/or downturn
nozzles.
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 accordance with the National Fuel Gas Code, ANSI Z223.1 NFPA 54.
A Canadian installation must be in accordance with the CSA B149 Instal-
lation Codes. These codes 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 Park-
ing 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 accordance 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
dimensions 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 application where the space temperature
of the location is below 50°F.
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 4.1.
WARNING: Internal heater surfaces that are accessible
from outside the heater will cause burns if touched. Sus-
pend 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 work-
ing zone as possible, and this fact should be kept in mind when determin-
ing the mounting heights to be used. However, care should be exercised to
avoid directing the discharged air directly on the room occupants.
Partitions, columns, counters, or other obstructions should be taken into
consideration 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 dis-
charge 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 ex-
posed to water spray, rain, or dripping water.
Location
Recommendations
Dimensions X, Y, and Z (feet) Model UEAS with Standard Horizontal Louvers at Mounting Heights of 5 - 18 ft
H
130 180 260 310
XY Z Louver
Angle* XY Z Louver Angle* XY Z Louver Angle* XY 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°
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
XY Z Louver
Angle* XY Z Louver Angle* XY Z Louver Angle* XY 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°
Form I-UEAS, P/N 221232 R6, Page 5

3. Receiving,
Uncrating, and
Preparing for
Installation
4. Clearances and
Dimensions
The presence of chlorine vapors in the combustion air of gas-red heating
equipment presents a potential corrosion hazard. Chlorine found usually in
the form of freon or degreaser vapors, when exposed to ame will precipi-
tate from the compound, and go into solution with any condensation that is
present in the heat exchanger or associated parts. The result is hydrochlo-
ric acid which readily attacks all metals including 300 grade stainless steel.
Care should be taken to separate these vapors from the combustion pro-
cess. 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 determining installation
location of the heater in relation to building exhaust systems.
2. Unit Heater
Location (cont’d)
Location Recommendations (cont’d)
Hazards of Chlorine
- applies to location of
Model UEAS heater with
regard to combustion air
inlet
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, document the damage with the transporting agency and contact
an authorized Reznor Distributor. If you are an authorized Distributor, fol-
low the FOB freight policy procedures as published by Thomas & Betts for
Reznor products.
Check the rating plate for the gas specications and electrical character-
istics 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
manpower. Be sure that the vent/combustion air kit (either vertical Option
CC2 or horizontal 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. Instruc-
tions 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.
4.1 Clearances
Units must be installed so that the clearances in the table are provided
for combustion 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 temperature of 90°F above the surrounding ambi-
ent temperature is not exceeded.
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.
IMPORTANT: Shipping
brackets are attached with
cabinet screws. When
removing shipping brack-
ets, re-insert ALL screws
into the cabinet.
Form I-UEAS, Page 6

4.2 Dimensions
FIGURE 2 - Model UEAS Dimensions




















 



  
FIGURE 3 - Dimension
“T” With Optional
Downturn Nozzle
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 PR S
Dimensions - inches (±1/8 inch)
130, 160 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, 160 511 995 408 303 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
"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
Form I-UEAS, P/N 221232 R6, Page 7

WARNINGS: Check the supporting structure to be used to
verify that it has sufcient load carrying capacity to sup-
port the weight of the unit. Suspend the heater only from
the threaded nut retainers or with a manufacturer provid-
ed kit. Do NOT suspend from the heater cabinet.
6. Hanging the
Heater
When the heater is lifted for suspension, support the bottom of the heater
with plywood or other appropriately placed material. If the bottom is not
supported, damage 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 7. A 3/8”-16 threaded nut retainer is located at
each suspension point (FIGURE 4A).
If ordered with swivel connectors, Option CK10, for 1” pipe attach the swiv-
els at the threaded nut retainers. Suspend with 1” pipes (FIGURE 4B).
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
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. Adjusting 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. High Altitude
Operation
FIGURE 4B - Swivel Connectors, Option
CK10, to Suspend the Heater from 1”
Pipes







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






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).
WARNING: Unit
must be level for
proper operation.
Do not place or add
additional weight to
the suspended heater.
Hazard Levels,
page 2.
Form I-UEAS, Page 8

WARNING: This appliance is equipped for a maximum
gas supply pressure of 1/2 psi, 3.5 kPa, or 14 inches wa-
ter 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 test-
ed. Cap or plug the supply line.
Test Pressures Below 1/2 PSI: Before testing, close the
manual valve on the heater.
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 hang-
ers, 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, consult the factory for proper oricing.
Pipe joint compounds (pipe dope) shall be resistant to the action of lique-
ed petroleum gas or any other chemical constituents of the gas being
supplied.
7. Mechanical
Sizing Gas Supply Line
7.1 Gas Piping and Pressure
7.1.1 Gas Supply
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.
Form I-UEAS, P/N 221232 R6, Page 9

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.



















 
Install a ground joint union and manual shutoff valve upstream of the unit
control system, as shown in FIGURE 5. Installation of a trap with a mini-
mum 3” (76mm) drip leg is required.
7.1.2 Gas Connections
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
7.1.3 Valve Outlet or
Orice Pressure Setting
Measuring valve outlet gas pressure cannot be done until the heater is in
operation. 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 maxi-
mum 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 Para-
graph 7.1.4 to convert for use with propane.
At startup, measure the valve outlet pressure. Refer to the pressure chart
on page 12 for correct outlet pressure.
When using propane, the inlet supply pressure to the valve must be a mini-
mum of 11” w.c. and a maximum of 14” w.c.
NOTE: A gas conversion kit
for changing from natural gas
to propane is included with
each heater. See Paragraph
7.1.4 for conversion instruc-
tions.
7. Mechanical
(cont’d)
7.1 Gas Piping and
Pressure (cont’d) The unit is equipped with a nipple
that extends outside the cabinet.
The gas connection is either 1/2”
or 3/4”.
Form I-UEAS, Page 10

Instructions
1) Locate the 1/8” output pressure tap on the valve (See FIGURE 6, page
12). 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 set-
tings, 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.
Check Valve Outlet
Pressure (can only be
done after heater is
operating)
NOTE: If operating at high
altitude, 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.
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.
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 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 manom-
eter 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
CAUTION: DO NOT
bottom out the gas
valve regulator adjust-
ing screw. This can
result in unregulated
manifold pressure
causing excess
overre and heat
exchanger failure.
Form I-UEAS, P/N 221232 R6, Page 11

7. Mechanical
(cont’d)
7.1 Gas Piping and
Pressure (cont’d) FIGURE 6 - Top
View of Valve
showing Outlet
Pressure Tap
and Adjustment
Locations
3. Turn the 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 on page 12. 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 instal-
lation, 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 pro-
pane 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 con-
spicuous 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 list inputs and capacities at altitudes from sea level to 10,000
ft (3045M).
High Altitude Capacity
Changes
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
7.1.3 Valve Outlet or Orice Pressure Setting (cont’d)
Top View - Single-Stage Valve
1/8”
Output
Pressure
Tap
Inlet Pressure
Tap
Output
Adjustment
Screw
Instructions for High Altitude Derate (cont’d)
Form I-UEAS, Page 12

7.1.4 Converting from
Natural Gas to Propane
Propane Conversion Kit 130 180 260 310
221442 221443 221444 221445
Regulator Spring Kit,
Honeywell #393691 98720
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 instruc-
tions to install. .
Conversion Instructions Install the propane spring regulator kit in the gas valve. Follow the
valve manufacturer’s instructions that are included with the spring con-
version kit.
Attach the propane disk near the gas valve.
Install the propane orice. Refer to FIGURE 28, page 43, and locate
the gas orice. Carefully remove the natural gas orice supplied on the
heater. Install the propane orice.
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.
During heater startup, follow the instructions in Paragraph 7.1.3 to
check the valve outlet pressure.
1)
2)
3)
4)
5)
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
7.2 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 horizontal 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 Para-
graph 7.3, page 28, 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 recom-
mended for the combustion air pipe.
7.2.1 Vent/Combustion
Air System
Requirements
Form I-UEAS, P/N 221232 R6, Page 13

7.2.1.2 Venter Outlet and Combustion Air Inlet
FIGURE 7 - Rear of a
Model UEAS Heater
showing the Locations
of Both Inlet Air
and Venter Outlet
Connections
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
horizontal 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 16, for making vent pipe joints.
The vent pipe drain connects into the heater condensate drain. Refer to
Paragraph 7.3, page 28, for condensate drain installation instructions.
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. Mechanical
(cont’d)
7.2 Venting and
Combustion Air
(cont’d)
7.2.1 Vent/Combustion
Air Requirements
(cont’d)
FIGURE 8A - U.S.
INSTALLATION
ONLY - Vertical
Vent showing
Where to Install
the Condensate
Drain
Connection
using factory-
provided 4” PVC
Cap
Form I-UEAS, Page 14








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



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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
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 28, 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
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 28, 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
Form I-UEAS, P/N 221232 R6, Page 15

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
7.2.1.5 Combustion Air Pipe Diameter and Length
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.
• 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.
The Schedule 40 PVC or CPVC vent system should be installed in a man-
ner consistent with normal industry standards and in compliance with all
local re and building code requirements. Failure to follow proper installa-
tion practices, procedures, or techniques can result in system failure, prop-
erty damage, or personal injury. The installer is responsible for the installa-
tion. 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.
Cut the pipe square. An angled cut may result in joint failure.
Remove burrs using a deburring tool, a le, or a knife edge. Re-
move 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°.
Use a clean dry cloth to remove surface dirt, grease, and moisture
from the pipe sections and ttings.
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.
Primer, Cement, and Applicator Requirements
Primer for joints should conform to ASTM F 656.
Cement for joints should conform to ASTM D 2564.
Use a 2-3” applicator brush for the 4” pipe and ttings.
Applying Primer and Cement (NOTE: Make joints one at a time as pipe
and tting should be assembled quickly while cement is uid.)
1.
a)
b)
2.
3.
a)
b)
c)
4.
7.2 Venting and
Combustion Air
(cont’d)
7. Mechanical
(cont’d)
7.2.1 Vent/Combustion
Air System
Requirements (cont’d)
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 or CC6
(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
Form I-UEAS, Page 16

7.2.1.7 Support
Apply primer to pipe and tting surfaces. Do not allow primer to
puddle inside the system.
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).
Coat the coupler (tting) socket with a medium layer of cement,
avoiding puddling inside the system.
Apply a second full even layer of cement on the pipe O.D.
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.
a)
b)
c)
d)
5.
Vent Pipe Support - For continued safe operation, the vent system must
be properly supported. A ten-foot (3M) length of 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 hangers 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 expansion. 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 CON-
CENTRIC 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 ver-
tical 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.
Combustion Air Pipe Support - Support a single-wall metal horizontal
combustion 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.
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.
Form I-UEAS, P/N 221232 R6, Page 17

7.2.1.9 Concentric Adapter Box
All Model UEAS installations require a concentric adapter box as illustrated
in FIGURES 11, 12, 13, and 14. The concentric adapter box is included
in both the horizontal 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
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 Vent/Combustion
Air System
Requirements (cont’d)
7.2 Venting and
Combustion Air
(cont’d)
7. Mechanical
(cont’d)
Form I-UEAS, Page 18





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
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





FIGURE 13 - Concentric Adapter Box Airow
FIGURE 14 - Concentric
Adapter Box
Connections






















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 24.
Horizontal,
Option CC6,
instructions
begin on
page 20.
Form I-UEAS, P/N 221232 R6, Page 19

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
1 221069 Concentric Adapter Box with Silicone Sealing Ring (See
Paragraph 7.2.1.9, pages 18-19.)
1 221089 Bird Screen for Exhaust Outlet
1 124940 Ring Guard for Air Inlet
4 37661 #10-16x1/2" lg Screws to attach the inlet air guard
4 221186 Spacers for inlet air guard
1 221091 4" PVC Cap for Vent Condensate Drain Connection (See
FIGURE 8A and 9A on page 14 and 15.)
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 23
• 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 13-19)
1. Determine the location on the outside wall for the vent/combustion
air terminal. Location must comply with vent length requirement in Para-
graph 7.2.1.4 on page 16. Also, read the “Hazards of Chlorine” on page 6
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 21. 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 23.
Products of combustion can cause discoloring of some building nishes
and deterioration of masonry materials. Applying a clear silicone sealant
that is normally used to protect concrete driveways can protect masonry
materials. If discoloration is an esthetic problem, re-locate the vent or install
a vertical vent.
WARNING: All vent terminals must be positioned or lo-
cated 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.
7.2 Venting and
Combustion Air
(cont’d)
7. Mechanical
(cont’d)
WARNING: In climates
with below freezing
temperatures, con-
densate may form
icicles on the vent
terminal. Locate the
terminal where a fall-
ing icicle would not
be a hazard.
Form I-UEAS, Page 20