Thomas & Betts UDAS, UDAP User Manual
Series Fan-Type
Table of Contents
Page
Warnings ........................................ 1
Installation/Operation .............. 2-25
Check/Test/Startup ................. 26-28
Maintenance/Service .............. 28-36
Index (by page)
Burner ................................................... 16, 29
Burner Orifice ............................................ 30
Burner Removal ........................................... 29
California Warning Label .............................. 3
Clearances .................................................... 7
Installation Codes ......................................... 2
Confined Space (UDAP) ............................... 8
Dimensions ................................................ 4-5
Disconnect, Built-in (UDAS) ................ 16, 34
Door Switch (UDAS) ............................19, 33
Downturn Nozzle (Option) ............................4
Electrical Connections ............................... 16
Fan............................................................... 32
Fan Motor...............................................22, 32
Flame Rollout Switch ......................... 18, 34
Gas Piping and Pressures ........................... 12
Gas Valve ...............................................22, 33
General .......................................................... 2
Hanging the Heater ......................................10
Hazard Intensity Levels ............................... 2
Heat Exchanger Maintenance ......................29
High Altitude ............................................ 6, 14
Ignition System ......................................19, 31
Limit Control .........................................18, 33
Location (Heater) ...........................................9
Maintenance Schedule ............................... 28
Pressure Switch (Combustion Air) ....... 17, 33
Replacement Parts ................ See Form P-UD
Sound Data ................................................... 6
Startup ..........................................................26
Suspending Heater ....................................... 4
Technical Data ...............................................6
Thermostat (Option) .................................. 17
Throw (Heater) ..............................................9
Transformer..................................................33
Troubleshooting ................................... 34-36
Uncrating and Preparation ........................... 3
Valve Outlet Pressure ...................................14
Vent System ............................................... 34
Venter Motor ............................................... 32
Venting Model UDAP ........ Use Form I-V-PV
Venting Model UDAP-CV Use Form I-V-CV
Venting Model UDAS ......... Use Form I-V-SC
Warranty.........................................................3
Wiring Diagrams.................................... 23-25
C E R T I F I E D
Unit Heaters
Installation/Operation FORM RZ-NA I-UDA
APPLIES TO: Models UDAP and UDAS
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 fire
department.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable 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.
WARNING: Gas-fired appliances are not designed for use in
hazardous atmospheres containing flammable vapors or
combustible dust, in atmospheres containing chlorinated or
halogenated hydrocarbons, or in applications with airborne
silicone substances. See Hazard Levels, page 2.
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 qualified service technician to inspect
the appliance and replace any gas control that has been under
water.
Form RZ-NA I-UDA, Mfg #195673 Rev 5, Page 1
Hazard Levels of
Warnings 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.
1. General
BOTH this manual and
the correct venting
manual are REQUIRED
for installation of this
heater.
Model UDAP 30 to 125 and Model UDAS 30 to 125 are design certified by the
Canadian Standards Association for use in residential, industrial, and commercial
installations. Models UDAP 150 to 400 and UDAS 150 to 400 are design certified
by the Canadian Standards Association for use in industrial and commercial installations only. All models and sizes are available for use with either natural or
propane gas. The type of gas, the input rate and the electrical supply requirement
is shown on the heater’s rating plate. Check the rating plate to determine if the
heater is appropriate for the intended installation.
Installation requires both this manual AND the venting manual.
Venting Manual by Model
Venting Instruction Look for Matching Label on
Model Manual by Form No. Venting Manual and Heater
UDAP Standard Power Vent Label with
Installation (each heater Red Square
has its own dedicated vent)
- Form RZ-NA I-V-PV
UDAP-CV Optional Common Vent Label with
with Installation (must be inverted
Option equipped with Option AV6) Blue Triangle
AV6 - Form RZ-NA I-V -CV
Model UDAP-CV is available in Sizes 30, 45, 60, 75, 100 only
UDAS Separated Combustion Label with
- Form RZ-NA I-V-SC Green Circle
2. Installation
Codes
Form RZ-NA I-UDA, P/N 195673 Rev 5, Page 2
Both this installation manual and the appropriate venting manual are shipped with
the heater. Verify that the literature is correct for the heater being installed. If
either manual is missing or incorrect, contact your distributor before beginning
installation.
The instructions in this manual apply only to the models listed.
Installation should be done by a qualified agency in accordance with these in-
structions. The qualified service agency installing this heater is responsible for the
installation.
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. A Canadian installation must be
in accordance with the CAN/CGA B149 Installation 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.
Special Installations
(Aircraft Hangars/
Repair Garages/
Parking Garages)
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
accordance with the requirements of the enforcing authorities, and in public garages in accordance with CAN/CGA B149 codes.
California Warning
Label
Massachusetts
Requirement
3. Warranty
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. The California Warning label is
shipped in the owner’s envelope along with this manual, the warranty form, and
any other paperwork that applies.
If installation is in California, 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, these units
must be installed by a licensed plumber or licensed gas fitter.
Refer to the limited warranty information on the Warranty Card in the "Owner's
Envelope".
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
modified.
4. Uncrating and
Preparation
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, follow the FOB freight policy procedures as published by Thomas & Betts for Reznor products.
Check the rating plate for the gas specifications and electrical characteristics of the
heater to be sure that they are compatible with the gas and electric supplies at the
installation site.
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.
If the installation includes optional vertical louvers, downturn nozzle, ceiling mounting bracket, hanger kit, high altitude kit, multiple heater control, and/or stepdown
transformer, install these options before the heater is suspended. Follow the instructions included in the option package; option packages are shipped separately .
Other shipped separate items could include a vent/combustion air kit, high temperature tape, a thermostat bracket kit, a thermostat, and/or a thermostat guard. Be
sure all options ordered are at the installation site.
IMPORTANT : Shipping brackets are attached with cabinet screws. When
removing shipping brackets, re-insert ALL screws into the cabinet.
Form RZ-NA I-UDA, Mfg #195673 Rev 5, Page 3
5. Dimensions
M and N - Hanger Dimensions for both 2-pt and 4-pt Suspension
N
P and Q -
Hanger
Dimensions
for 4-pt
Suspension
P
Q
3/8-16 Female Thread
- all suspension points
M
TOP VIEW
R - Hanger
Dimension for
2-pt Suspension
R
(30-125 Vertical;
150-400 Horizontal)
Thermostat
Connection
G
J
Combustion
Air Inlet
REAR
FIGURE 1 - Model UDAP,
Power Vented Fan Model
VIEW
Line Voltage
Inlet (connects
at circuit board)
B
D
FRONT
VIEW
C
A
1-1/4
(32)
K
External
Gas
H
Connection
F
RIGHT SIDE
VIEW
(Access Panel)
E
Vent Collar
(see Technical
Data for size)
REZNOR
MODEL UDAP DIMENSIONS (inches ± 1/16)
Size
30, 45 12-1/8 26-5/8 10 13-13/16 26 2 1-9/16 5-3/16 6-1/2 2-11/16 3-7/8 17-3/8 11/16 4-5/16 13 9-9/16
60 15-1/8 2 6-5/8 13 13-13/16 27 21-9/16 7-7/8 6-1/2 5-1/2 3-7/8 17-3/8 11/16 4-5/16 13 10-1/2
75 15-1/8 26-5/8 13 13-13/16 27-5/8 21-9/16 7-7/8 6-1/2 5-1/2 3-7/8 17-3/8 11/16 4-5/16 13 10-1/2
100 2 3-1/8 26-5/8 21 13-13/16 28-5/8 21-9/16 14-1/2 6-1/2 8-3/4 3-7/8 17-3/8 11/16 4-5/16 13 10-1/2
125 2 3-1/8 26-5/8 21 13-13/16 29-3/8 21-9/16 14-1/2 6-1/2 8-3/4 3-7/8 17-3/8 11/16 4-5/16 13 10-1/2
150, 175,
200
225, 250 26-1/8 38-3/16 22 23 42 35-3/8 13-1/16 8-13/16 9 6-1/2 25-11/16 1-3/8 8-3/16 22-3/16 15-5/8
300, 350,
400
MODEL UDAP DIMENSIONS (mm ± 2)
Size A B C D E F G H J K M N P Q R
30, 45 308 676 254 351 660 548 132 165 6 8 98 441 17 110 330 243
60 384 676 330 351 6 86 548 200 1 65 140 98 441 17 1 10 330 267
75 384 676 330 351 7 02 548 200 1 65 140 98 441 17 110 330 267
100 58 7 676 533 351 727 548 368 165 222 98 441 17 110 330 267
125 58 7 676 533 351 746 548 368 165 222 98 441 17 110 330 267
150, 175,
200
225, 250 664 970 559 584 1067 899 332 2 24 229 165 652 35 208 564 397
300, 350,
400
FIGURE 2 With Optional
Downturn Nozzle
Dimension “U”
-- Applies to both
UDAP and UDAS
Form RZ-NA I-UDA, P/N 195673 Rev 5, Page 4
ABC D EF G H J K MNPQ R
20-1/8 38-3/16 16 23 42 35-3/8 8-1/2 8-1/4 5-7/16 6-1/2 2 5-11/16 1-3/8 8-3/16 22-3/16 16-3/8
34-1/8 41 30 23 42 35-3/8 17-1/16 9 11-13/16 7-5/16 27-11/16 1-3/8 8-3/16 22 -3/16 16-3/16
511 970 406 584 1067 899 216 210 138 165 652 35 208 564 416
867 1041 762 584 1067 899 433 229 300 186 703 35 208 564 411
O ption C D3
With
Option
CD2
or CD4
With
Option
CD3
Size
O ptions CD2 a nd C D4
inches mm inches mm
30, 45 7-1/8 181 12-3/8 314
60, 75 8-5/8 219 15 381
100, 125 12-5/8 321 21-7/8 556
150, 175, 200 11-1/2 292 19-7/8 505
U U
225, 250 14-1/2 368 25-1/8 638
300, 350, 400 18- 1/2 470 32 813
M and N - Hanger Dimensions
for both 2-pt and 4-pt Suspension
N
M
R - Hanger
Dimension for
2-pt Suspension
FIGURE 3 - Model UDAS,
Separated Combustion Fan
Combustion Air Connection
(see Technical Data for size)
Model
T
S
J
REAR
VIEW
K
(Access Panel)
External
Gas
H
Connection
E
F
RIGHT SIDE
VIEW
Vent Connection
(see Technical
Data for size)
P and Q -
Hanger
Dimensions
for 4-pt
Suspension
P
Thermostat
R
Connection
TOP VIEW
Q
3/8-16 Female Thread
- all suspension points
D
C
A
B
FRONT
VIEW
(30-45, 150-400
Horizontal;
60-125 Vertical)
G
Line Voltage
Inlet (connects in
sealed electrical box)
1-1/4
(32)
REZNOR
MODEL UDAS DIMENSIONS (inches ± 1/16)
Size
30, 45 12-1/8 26-5/8 10 13-13/16 26 21-9/16 5-3/16 6-1/2 2-11/16 3-7/8 17-3/8 11/16 4-5/16 13 9-9/16 2-15/16 2-15/16
150,
175,
225,
300,
350,
MODEL UDAS DIMENSIONS (mm ± 2)
Size A B C D E F G H J K M N P Q R S T
30, 45 308 676 254 351 660 548 132 165 68 98 441 17 110 330 243
100
125
150,
175,
225,
300,
350,
ABCD EF G H J KMNPQ R S T
60 15-1/8 26-5/8 13 13-13/16 27 21-9/16 7-7/8 6-1/2 5-1/2 3-7/8 17-3/8 11/16 4-5/16 13 10-1/2 3-1/4 2-15/16
75 15-1/8 26-5/8 13 13-13/1627-5/8 21-9/16 7-7/8 6-1/2 5-1/2 3-7/8 17-3/8 11/164-5/16 13 10-1/2 3-1/4 2-15/16
100 23-1/8 26-5/8 21 13-13/1628-5/821-9/16 14-1/2 6-1/2 8-3/4 3-7/8 17-3/8 11/16 4-5/16 13 10-1/2 4-5/8 2-15/16
125 23-1/8 26-5/8 21 13-13/1629-3/821-9/16 14-1/2 6-1/2 8-3/4 3-7/8 17-3/8 11/16 4-5/16 13 10-1/2 4-5/8 2-15/16
20-1/8 38-3/16 16 23 42 35-3/8 8-1/2 8-1/4 5-7/16 6-1/2 25-11/16 1-3/8 8-3/1622-3/16 16-3/8 4-1/8 8-5/16
200
26-1/8 38-3/16 22 23 42 35-3/8 13-1/16 8-13/16 9 6-1/2 25-11/16 1-3/8 8-3/1622-3/16 15-5/8 5-9/16 8-5/16
250
34-1/8 41 30 23 42 35-3/8 17-1/16 9 11-13/16 7-5/16 27-11/16 1-3/8 8-3/1622-3/16 16-3/16 9-1/16 8-9/16
400
75 75
60
384 676 330 351 686 548 200 165 140 98 441 17 110 330 267 89 75
384 676 330 351 702 548 200 165 140 98 441 17 110 330 267
75
587 676 533 351 727 548 368 165 222 98 441 17 110 330 267
89 75
117 75
587 676 533 351 746 548 368 165 222 98 441 17 110 330 267 117 75
511 970 406 584 1067 899 216 210 138 165 652 35 208 564 416
200
664 970 559 584 1067 899 332 224 229 165 652 35 208 564 397
250
867 1041 762 584 1067 899 433 229 300 186 703 35 208 564 411
400
Form RZ-NA I-UDA, Mfg #195673 Rev 5, Page 5
105 211
141 211
230 217
6. Technical Data
C
y
(
D
/
C
)
C
y
(
D
/
(
)
(
)
TECHNICAL DATA - Sizes 30 - 125
Size 30 45 60 75 100 125
Input Heating Capacity
Thermal Efficiency (%) 828383838383
A
Output Heatin g Capacity
Gas Connection (inches)
Vent Connection
Combustion Air Inlet
Control Amps (24 volt) 1.0 1.0 1.0 1.0 1.0 1.0
Full Load Amps (115 volt) 1.9 2.4 2.4 3.3 3.9 5.1
Maximum Over Current Protection
Normal Power Consumption (watts) 109 155 155 217 276 354
Discharge Air Temperature Rise (°F) 50 55 60 60 60 60
Air Volume
Discharge Air Opening Area
Output Velocity
Fan Motor HP
Fan Motor RPM 1550 1550 1550 1550 1050 1050
Fan Diameter (inches) 10 10 12 12 16 16
Sound Level dba @ 15 ft 40 40 40 49 54 55
B
C
(inches diameter )
(inches diameter) -
E
115V)
Data applies to both Models UDAP and UDAS unless noted otherwise.
BTUH 30,000 45,000 60,000 75,000 105,000 120,000
kw 8.8 13.2 17.6 22.0 30.8 35.2
BTUH 24,600 37,350 49,800 62,250 87,150 99,600
kw 7.2 11.0 14.6 18.3 25.6 29.2
Natural 1/2 1/2 1/2 1/2 1/2 1/2
Propane 1/2 1/2 1/2 1/2 1/2 1/2
444444
UDAS onl
CFM 456 629 769 961 1345 1537
3
minute
M
2
ft
2
M
FPM 475 656 616 770 668 763
M/minute 145 200 188 238 196 245
Open 0.02 0.03 0.03 0.06 1/30 1/20
Enclosed N.A. N.A. N.A. N.A. 1/4 1/4
444444
15 15 15 15 15 15
12.9 17.8 21.8 27.5 36.7 45.9
0.96 0.96 1.25 1.25 2.01 2.01
0.09 0.09 0.12 0.12 0.19 0.19
TECHNICAL DATA - Sizes 150 - 400
Data applies to bo th Models UDAP and UDAS unless noted othe rwise.
Size 150 175 200 225 250 300 350 4 00
Input Heating Capacity
Thermal Efficiency (%) 83838383838383 83
Output Heatin g Capacity
Gas Connection (inches)
Vent Connection
Combustion Air Inlet
A
B
(inches diameter
(inches diameter) Control Amps (24 volt) 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
Full Load Amps (115 volt) 3.8 3.8 4.6 7.5 7.5 10.7 10.7 10.7
Maximum Over Current Protection
Normal Power Consumption (watts) 392 392 491 747 747 1086 1086 1086
Discharge Ai r Temperature Rise (°F) 60 60 60 60 60 60 60 60
Air Volume
Discharge Air Opening Area
Output Velocity
Fan Motor HP
E
Fan Motor RPM 1050 1050 1050 1050 1050 1050 1050 1050
Fan Diameter (inches) 18 18 18 20 20 24 24 24
Sound Level dba @ 15 ft 51 52 53 56 56 59 61 62
A
CSA ratings for altitudes to 200 0 ft.
C
Smaller and/or larger vent and combustion air pipe diameters may be permissible. For Model UDAS refer to the Venting Installation Manual for Separated
Combustion Units. Fo r Mod el UDAP refer to the Venting Installation Manual for Power Vented units. For a Model UDAP with Option AV6, refer to the
Venting Installation Manual for Common Venting.
D
MOCP = 2.25 x (largest motor FLA) + smallest motor FLA. Answer is rounded to the next lower standard circuit breaker size.
E
All other information is this table is based on a heater equipped with a s tandard 115 volt open fan motor.
BTUH 150,000 175,000 200,000 225,000 250,000 300,000 350,000 400,000
kw 43.9 51.2 58.6 65.9 73.2 87.8 102.5 117.1
BTUH 124,500 145,250 166,000 186,750 207,500 249,000 290,500 332,000
kw 36.4 42.5 48.6 54.7 60.8 72.9 85.1 97.2
Natural 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4
Propane 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4
5555566 6
6666666 6
15 15 15 15 15 20 20 20
54.4 63.5 72.5 81.6 90.7 108.8 126.9 145.1
2.56 2.56 2.56 3.51 3.51 4.79 4.79 4.79
0.24 0.24 0.24 0.33 0.33 0.45 0.45 0.45
115V)
UDAS onl
CFM 1921 2242 2562 2882 3202 3843 4483 5123
3
M
minute
2
ft
2
M
FPM 752 877 1003 820 911 802 936 1069
M/minute 229 267 306 250 278 244 285 326
Open 1/6 1/6 1/6 1/4 1/4 1/2 1/2 1/2
Enclosed 1/4 1/4 1/4 1/4 1/4 1/2 1/2 1/2
B
Size shown is for gas connection to a single-stage gas valve, not supply line size.
Form RZ-NA I-UDA, P/N 195673 Rev 5, Page 6
7. High Altitude
p
k
g
p
p
p
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.
Operation
In addition, if the heater is being installed at an altitude above 6000 ft (1830M), the
pressure switch will have to be changed. If ordered with the unit as Option DJ20 or
DJ21, the pressure switch is shipped separately.
Gas valve adjustment for
high altitude can only be
done after heater is
operating; see
Paragraph 12.
Adjusting the valve outlet pressure is done after the heater is in operation; follow
the instructions in Paragraph 12. Capacities and inputs for derated units are also
listed in Paragraph 12.
If the pressure switch needs to be changed, do that before the heater is operated;
follow the instructions in FIGURE 4.
FIGURE 4 - Installing High Altitude Pressure Switch required above 6000 ft (1830M) elevation
Model UDAP
Size 30 45 60 75 100 125 150 175 200 225 250 300 350 400
High Altitude Switch P/N
Negative Pressure OFF Setpoint "w.c.
Label color
Model UDAP-C V with Option AV6 for Common Venting
Size 30 45 60 75 100
High Altitude Switch P/N 197029 197032 196388
Negative Pressure OFF Setpoint "w.c. 0.60 0.45 0.50
Label color Lt Blue Pin
Model UDAS
Size 30 45 60 75 100 125 150 175 200 225 250 300 350 400
High Altitude Switch P/N 196388 197030
Differential Pressure OFF Setpoint "w.c. 0.50 0.40
Label color Oran
197031 197032
0.35 0.45
Pur
le Pink
196362
0.55
White
197029
0.60
Lt. Blue
Orange
eGreen
197031
0.35
Pur
197031
Pur
le
0.35
201160
1.00
Brown
201160 201161
1.00 1.30
le
Brown
201161
1.30
White
White
Pressure Switch
8. Clearances
Clearances
Size
30-125 1 25 6 152 18 457 1 25 1 25 18 457
150-400 4 102 6 152 18 457 2 51 1 25 18 457
*Suspend the he ater so that the bot tom is a minimum of 5 feet ( 1 .5M) a bov e t h e floor .
Instructions for Changing Pressure Switch
1. In the control compartment, locate the pressure switch.
Sizes 30-125 - On the back wall of the control compartment.
Sizes 150-400 - On the bracket on the bottom of the control compartment.
2. Mark and disconnect the two wires attached to the pressure switch.
3. Disconnect the sensing tube from the pressure switch.
4. Locate the two screws holding the switch mounting bracket. Remove the
screws (save screws) and the pressure switch.
5. Using the same screws, install the high altitude pressure switch. Attach the
sensing tube and wires.
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 defined 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 ambient temperature is not exceeded.
To
inches mm inches mm inches mm inches mm inches mm inches mm
Flue Connector Access Panel Non-Access Side
Bottom* Rear
Form RZ-NA I-UDA, Mfg #195673 Rev 5, Page 7
9. Combustion
Air -
applies to
Model UDAP
and Model
UDAP-CV
(Note: For Model
UDAS, see Venting
Manual for
combustion air
requirements.)
This heater must be supplied with the air that enters into the combustion process
and is then vented to the outdoors. Sufficient air must enter the equipment location
to replace that exhausted through the heater vent system. In the past, the infiltration of outside air assumed in heat loss calculations (one air change per hour) was
assumed to be sufficient. However , current construction methods using more insulation, vapor barriers, tighter fitting and gasketed doors and windows, weatherstripping, and/or mechanical exhaust fans may now require the introduction of
outside air through wall openings or ducts.
The requirements for combustion and ventilation air depend upon whether the unit
is located in a confined or unconfined space. An "unconfined space" is defined as
a space whose volume is not less than 50 cubic feet per 1000 BTUH of the installed
appliance. Under ALL conditions, enough air must be provided to ensure there
will not be a negative pressure condition within the equipment room or space.
WARNING: Model UDAP and UDAP-CV power-vented unit
heaters are designed to take combustion air from the space in
which the unit is installed and are not designed for connection to
outside combustion air intake ducts. Connecting outside air ducts
voids the warranty and could cause hazardous operation. See
Hazard Levels, page 2.
Combustion Air
Requirements for
a Heater Located
in a Confined
Space - applies to
Model UDAP and
Model UDAP-CV
FIGURE 5 - Definition of
Confined Space and
Required Openings for
Combustion Air
Do not install a unit in a confined space without providing wall openings leading
to and from the space. Provide openings near the floor and ceiling for ventilation
and air for combustion as shown in FIGURE 5, depending on the combustion air
source as noted in Items 1, 2, and 3 below.
Add total BTUH of all appliances in the confined space and divide by figures
below for square inch free area size of each (top and bottom) opening.
Confined Space:
A space whose volume is
less than 50 cubic feet
per 1000 BTUH of the
installed appliance input
rating
1. Air from inside the building -- openings 1 square inch free area per 1000
BTUH. Never less than 100 square inches free area for each opening. See (1) in
FIGURE 5.
2. Air from outside through duct -- openings 1 square inch free area per 2000
BTUH. See (2) in FIGURE 5.
3. Air direct from outside -- openings 1 square inch free area per 4000 BTUH.
See (3) in FIGURE 5.
(3)
Confined
Space
(3)
(1)
(1)
(2)
(2)
Form RZ-NA I-UDA, P/N 195673 Rev 5, Page 8
NOTE: For further details on supplying combustion air to a confined space, see
the National Fuel Gas Code ANSI Z223.1a (latest edition).
10. Unit Heater
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Location
Use the sound data in Paragraph 6, clearances in Paragraph 8; the combustion air
requirements in Paragraph 9; the throw tables, mounting height requirements, and
location recommendations below; the weights in Paragraph 11; and the venting
requirements in the Venting Manual to determine where to suspend the heater.
Heater Throw
*Louver angle listed in the table is relative to the top of the heater.
FIGURE 6 - Throw for Fan
Models UDAP and UDAS
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 UDA P and Model UDAS with Standar d Hor i zontal Lo uver s at Mounting Heights of 5 - 18 ft
H
5 ft 6 14 30 -21 ° 7 16 40 -20° 8 18 45 - 16° 9 20 57 -14° 9 20 59 -18° 10 22 65 -14°
8 ft 7 13 26 -39 ° 9 16 37 -34° 10 18 42 -29° 12 22 54 -25° 11 21 56 -28° 12 2 3 63 -24°
10 ft 6 11 22 -52° 9 15 33 -43° 10 17 39 -37° 12 22 52 -32° 12 20 52 -36° 13 24 60 -30°
12 ft - - - - 8 12 27 -55° 10 16 34 -46° 12 21 48 -39° 11 19 47 -44° 14 23 57 -36°
14 ft - - - - - - - - 9 14 29 -56° 12 19 44 -46° 11 17 42 -51° 14 22 53 -43°
16 ft - - - - - - - - - - - - 11 17 38 -54° 10 14 34 -58° 13 20 47 -50°
18 ft------------------ - -111740-57°
H
8 ft 1 3 24 73 -26° 15 28 90 -22° 16 30 93 -20° 14 27 86 -24° 16 29 93 -21° 15 28 94 -24° 17 31 105 -20° 18 34 113 -17°
10 ft 14 24 69 -32° 17 29 87 -27° 17 31 91 -25° 15 27 82 -30° 17 30 90 -26° 16 28 89 -29° 18 32 103 -25° 20 35 110 -21°
12 ft 14 24 64 -39° 18 29 84 -32° 18 31 88 -30° 16 27 78 -35° 18 30 87 -31° 17 28 85 -34° 19 32 98 -30° 21 36 108 -25°
14 ft 14 22 59 -45° 18 28 79 -37° 19 30 84 -34° 16 26 73 -41° 18 30 83 -36° 17 27 80 -40° 20 32 95 -34° 23 35 105 -29°
16 ft 13 20 53 -51° 18 27 74 -42° 19 29 79 -39° 16 24 67 -47° 19 28 78 -41° 17 25 74 -45° 21 31 90 -38° 23 35 101 -33°
18 ft 11 17 44 -58° 17 26 68 -48° 19 28 74 -44° 14 22 60 -53° 18 27 72 -46° 16 24 66 -51° 20 30 85 -43° 23 35 97 -37°
Dimensions X, Y, and Z (mete rs) Model UDAP and Model UDAS with Standard H ori zontal Louvers at Mounting Heights of 1.5 - 5.5M
H
1.5 M 1.8 4.3 9.1 -21° 2.1 4.9 12.2 -20° 2.4 5.5 13.8 -16° 2.7 6.1 17.4 -14° 2.7 6.1 18.0 -18° 3.0 6.7 19.9 -14°
2.4 M 2.1 4.0 7.9 -39° 2.7 4.9 11.3 -34° 3.0 5.5 12.8 -29° 3.7 6.7 16.5 -25° 3.4 6.4 17.1 -28° 3.7 7.0 19.2 -24°
3.0 M 1.8 3.4 6.7 -52° 2.7 4.6 10.0 -43° 3.0 5.2 11.9 -37° 3.7 6.7 15.8 -32° 3.7 6.1 15.8 -36° 4.0 7.3 18.3 -30°
3.7 M - - - - 2.4 3.7 8.2 -55° 3.0 4.9 10.4 -46° 3.7 6.4 14.6 -39° 3.4 5.8 14.3 -44° 4.3 7.0 17.4 -36°
4.3 M - - - - - - - - 2.7 4.3 8.8 -56° 3.7 5.8 13.4 -46° 3.4 5.2 12.8 -51° 4.3 6.7 16.1 -43°
4.9 M - - - - - - - - - - - - 3.4 5.2 11.6 -54° 3.0 4.3 10.4 -58° 4.0 6.1 14.3 -50°
5.5 M------------------ - -3.45.212.2-57°
H
2.4 M 4.0 7.3 22.3 -26° 4.6 8.5 27.4 -22° 4.9 9.1 28.0 -20° 4.3 8.2 26.2 -24° 4.9 8.8 28.3 -21° 4.6 8.5 28.7 -24° 5.2 9.4 32.0 -20° 5.5 11.3 34.4 -17°
3.0 M 4.3 7.3 21.0 -32° 5.2 8.8 26.6 -27° 5.2 9.4 27.7 -25° 4.6 8.2 25.0 -30° 5.2 9.1 27.4 -26° 4.9 8.5 27.1 -29° 5.5 9.8 31.4 -25° 6.1 10.7 33.5 -21°
3.7 M 4.3 7.3 19.5 -39° 5.5 8.8 25.6 -32° 5.5 9.4 26.8 -30° 4.9 8.2 23.8 -35° 5.5 9.1 26.5 -31° 5.2 8.5 25.9 -34° 5.8 9.8 29.9 -30° 6.4 11.0 32.9 -25°
4.3 M 4.3 6.7 18.0 -45° 5.5 8.5 24.1 -37° 5.8 9.1 25.6 -34° 4.9 7.9 22.3 -41° 5.5 9.1 25.3 -36° 5.2 8.2 24.4 -40° 6.1 9.8 29.0 -34° 7.0 10.7 32.0 -29°
4.9 M 4.0 6.1 16.2 -51° 5.5 8.2 22.6 -42° 5.8 8.8 24.1 -39° 4.9 7.3 20.4 -47° 5.8 8.5 23.8 -41° 5.2 7.6 22.6 -45° 6.4 9.4 27.4 -38° 7.0 10.7 30.8 -33°
5.5 M 3.4 5.2 13.4 -58° 5.2 7.9 20.7 -48° 5.8 8.5 22.6 -44° 4.3 6.7 18.3 -53° 5.5 8.2 21.9 -46° 4.9 7.3 20.1 -51° 6.1 9.1 25.9 -43° 7.0 10.7 26.9 -37°
30 45
XYZ
150 175 200 225 350 400
XYZ
30 45 60
XYZ
150 175 200 400225 250 300 350
XYZ
le*
XYZ
An
Louver
le*
XYZ
An
Louver
le*
XYZ
An
Louver
le*
XYZ
An
Louver
le*
XYZ
An
Louver
le*
XYZ
An
Louver
le*
XYZ
An
Louver
le*
XYZ
An
Louver
H
X
Y
Z**
60
Louver
Louver
Louver
Louver
75 100 125
le*
XYZ
An
le*
XYZ
An
75 100 125
le*
XYZ
An
le*
XYZ
An
le*
XY Z
An
Louver
le*
XY Z
An
Louver
le*
XY Z
An
Louver
le*
XY Z
An
Louver
250 300
le*
XY Z
An
Louver
le*
XY Z
An
Louver
le*
XY Z
An
Louver
le*
XY Z
An
Louver
le*
An
Louver
le*
XYZ
An
Louver
le*
An
Louver
le*
XYZ
An
Louver
**Z is the point
when the air velocity
drops below 50 feet
(15.2M) per minute.
le*
XYZ
An
Louver
le*
XYZ
An
Louver
le*
An
Louver
le*
An
Louver
Location
Locate the heater so that it is a minimum of five feet (1.5M) above the floor and in
compliance with the clearances in Paragraph 8.
Recommendations
W ARNING: If touched, the vent pipe and internal heater surfaces
that are accessible from outside the heater will cause burns.
Suspend the heater a minimum of 5 feet (1.5M) above the floor.
Form RZ-NA I-UDA, Mfg #195673 Rev 5, Page 9
10. Unit Heater
Location
(cont’d)
NOTE: Venting
requirements may
affect location.
Consult the Venting
Manual for this heater
before making final
determination.
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 floor . 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 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 airflow will be
deflected 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 infiltration 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.
Hazards of Chlorine applies to location of
Model UDAS heater
with regard to
combustion air inlet
11. Hanging the
Heater
WARNINGS: Check the
supporting structure to
be used to verify that it
has sufficient 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.
The presence of chlorine vapors in the combustion air of gas-fired heating equipment presents a potential corrosion hazard. Chlorine found usually in the form of
freon or degreaser vapors, when exposed to flame 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.
Before suspending the heater, check the supporting structure to be used to verify
that it has sufficient load-carrying capacity to support the weight of the unit.
Model UDAP
Size
30 45 60 75 100 125 150 175, 200 225 250 300 350 400
54 59 67 72 96 101 172 187 203 215 269 294 306
lbs
24 27 30 33 44 46 78 85 92 98 122 133 139
kg
Model UDAS
Size
30 45 60 75 100 125 150 175, 200 225 250 300 350 400
lbs 55 60 68 73 97 102 173 188 204 216 270 295 307
kg 25 27 31 33 44 46 78 85 93 98 122 134 138
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 all screws used for holding shipping brackets were re-installed in the cabinet.
The heater is equipped for either two-point or four-point suspension. A 3/8"-16
threaded nut retainer is located at each suspension point. See Dimensions in Paragraph 5 and the illustration in FIGURE 7A.
Form RZ-NA I-UDA, P/N 195673 Rev 5, Page 10
FIGURE 7A - Suspending
®
the Heater with Rods from
the Threaded Nut Retainers
(either two or four point
suspension)
WARNING: Unit must
be level for proper
operation. Do not place
or add additional weight
to the suspended heater.
Hazard Levels, page 2.
FIGURE 7B - Swivel
Connectors to Suspend the
Heater from 1” Pipe, Option
CK8 (2-pt) or CK10 (4-pt)
Be sure the threaded hanger rods
are locked to the heater as
illustrated.
3/8 threaded rod
(field supplied)
Add a 3/8 nut and
washer to lock the
hanger rod to the heater.
Recommended maximum hanger
rod length is 6 feet (1.8M).
If ordered with swivel connectors for 1” pipe, Option CK8 or CK10, attach the
swivels at the threaded nut retainers. Suspend with 1” pipe. (See FIGURE 7B.)
Be sure the
threaded swivel
connectors are
locked to the
heater as
illustrated.
Lock the swivel
connector to
the heater.
The connector
is threaded for
hanging from
a 1 pipe.
FIGURE 8 - Suspending the
Heater using Option CK22,
Ceiling Suspension Kit (no
hanger rods)
FIGURE 9 - Model UDAS Plug the unused suspension
points on the control side of
the heater with 3/8”-16
screws and flat washers
If ordered with a ceiling suspension kit, Option CK22, follow the illustrated instructions in the kit. (See FIGURE 8.)
A vailable for
Sizes 30-125.
Allows the
heater to be
installed one
inch from the
ceiling.
NOR
Model UDAS - Whether using the suspension points or the hanger kit, when installing a Model UDAS, the unused suspension points on the control side of the
heater MUST be plugged. Plug these holes with the 3/8”-16 bolts and flat washers shipped in the bag with the heater. (See FIGURE 9.)
Plug any unused suspension points
on the control side with the 3/8-16
bolts and flat washers provided.
Control Side
Model UDAS
Form RZ-NA I-UDA, Mfg #195673 Rev 5, Page 11
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