! WARNING: Installation

Form I-ADF (12-15)
Obsoletes Form I-ADF (Version A.3)
Installation
Applies to: Indoor or Outdoor Gas, Direct-Fired,
Makeup Air/Heating Systems,
Model ADF and Model ADFH
Model ADF
! 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 flammable 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 fire department.
—— Installation and service must be performed by a qualified installer, service agency,
or the gas supplier.
Form I-ADF, P/N 131805 R6, Page 1
Table of Contents
1.0 General.......................................................... 2
6.0 Mechanical.................................................... 9
2.0 Location........................................................ 3
7.0 Electrical and Wiring................................. 19
1.1 Hazard Labels and Notices..............................2
1.2 General Description ........................................3
1.3 Warranty............................................................3
1.4 Installation Codes.............................................3
3.0 Uncrating and Preparation.......................... 4
3.1 Uncrating and Inspecting.................................4
3.2 Preparing for Installation.................................4
4.0. Clearances and Dimensions ..................... 4
4.1 Clearances to Combustibles...........................4
4.2 Dimensions.......................................................4
5. Mounting ........................................................ 7
5.1 Weights..............................................................7
5.2 Rigging..............................................................7
5.3 Mounting on Field-Supplied Supports ...........7
5.4 Mounting on a Roof Curb.................................8
1.0 General
Hazard Intensity
Levels Apply to
Warnings throughout
this Manual
6.1 Gas Piping and Pressures...............................9
6.2 Unit Inlet Air....................................................11
6.3 Supply Air Discharge.....................................18
6.4 Blowers, Drives, and Blower Motors............19
7.1 General............................................................19
7.2 Supply Wiring..................................................19
7.3 Control Wiring ................................................20
8.0 Controls...................................................... 21
9.0 Commissioning and Startup..................... 22
9.1 Checks Before Startup ..................................22
9.2 Startup.............................................................24
9.3 Startup for Continuous Operation................26
Index.................................................................. 27
Additional References..................................... 27
INSTALLATION RECORD................................. 28
1.1 Hazard Labels and Notices
There are warning labels on the unit and throughout this manual. For your safety, read
the definitions below and comply with all boxes labeled CAUTION, WARNING, and
DANGER during installation, operation, maintenance and service of this heater.
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: 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, or atmospheres containing
chlorinated or halogenated hydrocarbons. See Hazard
Levels above.
Form I-ADF, Page 2
1.2 General
Description
The information in this manual applies to Model ADF and Model ADFH in Sizes 300,
500, 700 and 1200. Both Model ADF and ADFH are direct-fired makeup air heating
systems. Model ADFH is designed with a high discharge air temperature.
These systems consist of a direct-fired, gas-fueled burner and a draw-through blower
housed in a weatherized cabinet. The systems may be installed either indoors or outdoors and are available for use with either natural or propane gas.
This direct-fired makeup air system provides tempered makeup air. Makeup air
is defined as air that enters a building or area due to negative pressure created by
an air exhaust load in excess of the volume of entering air. This system warms the
outside air (or cools if equipped with an evaporative cooling module) and monitors
the volume and temperature of the makeup air added to the building. The system
may be used to provide ventilation in whole building or in spot applications. In whole
building applications, adding controlled makeup air will cause less infiltration of dust
and dirt; will eliminate continuous backdraft in chimneys and vents; and will reduce
space heating fuel costs.
1.3 Warranty
Refer to the limited warranty information on the warranty form included in the "Owner's
Envelope".
1.4 Installation
Codes
These systems are design-certified to ANSI and CSA Standards. In order to retain
certification, the installer must adhere to the installation and operation requirements
in the instruction manual. These direct-fired makeup air systems are not approved for
residential use.
Installation should be done by a qualified agency in accordance with the instructions
in this manual and in compliance with all codes and requirements of authorities having
jurisdiction. The qualified agency installing this system is responsible for the installation.
This direct-fired makeup air system 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 (latest edition). A Canadian installation
must be in accordance with the CAN/CGA B149.1 and B149.2 Installation Code for Gas
Burning Appliances and Equipment. 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.
Before installation, always consult authorities having local jurisdiction to verify that
local codes and procedures are being followed.
The building should always provide adequate relief for the heater to operate at its
rated capacity. It should be noted that this can be accomplished by taking into account,
through standard engineering methods, the structure's designed infiltration rate; by
providing properly sized relief openings; by interlocking a powered exhaust system;
or by a combination of these methods. Insufficient ventilation air which results in
inadequate dilution of the combustion products generated by the heater may create
hazardous concentrations of carbon dioxide, carbon monoxide, nitrogen dioxide, and
other combustion products into the heated space.
If the failure or malfunction of this heater creates a hazard to other fuel burning equipment in the building, interlock the system to open inlet dampers or other such devices.
Codes for Special Installations: (1) Aircraft Hangar -- Installation in an aircraft hangar
must be in accordance with the Standard for Aircraft Hangars, ANSI/NFPA 409 (latest
edition) or CAN/CGA B149 Installation Codes; (2) Public Garage -- Installation in a
public garage must be in accordance with the Standard for Parking Structures, ANSI/
NFPA 88A (latest edition) or the Standard for Repair Garages, ANSI/NFPA 88B (latest
edition) or in Canada with CAN/CGA B149 Installation Codes.
2.0 Location
Location must comply with clearances in Paragraph 4.1. Makeup air should enter at
the highest point practical. By doing this, the fresh air will entrain dust laden air at the
ceiling and move it toward the point of exhaust. Also, fresh air directed downward from
the roof or ceiling will mix with hot ceiling air resulting in improved distribution of heat
in the building.
Always introduce fresh makeup air so that it moves across the greatest distance within
the room or building before reaching an exhauster.
Form I-ADF, P/N 131805 R6, Page 3
3.0 Uncrating and
Preparation
3.1 Uncrating and Inspecting
3.2 Preparing for
Installation
Shipped-Separate Components
Check for any damage that may have been incurred during shipment. If damage is
found, document the damage with the carrier and immediately contact an authorized
Reznor® distributor.
Check the gas specifications and electrical voltage (system rating plate is in the control
compartment) to be sure that they agree with the utilities at the installation site.
Locate the 4x4 junction box with a 3-positon switch shipped inside the unit. (NOTE:
Two exceptions - 1) If an optional remote console was ordered, this switch is mounted
on the console which is shipped separately. 2) If gas control Option AG37 was ordered,
the junction box is not included)
Depending on the gas and/or air controls selected, the following additional parts are
shipped loose in the unit or shipped separately.
Gas Control Options
Shipped-Loose Parts
AG30, AG32, AG33, AG35
*Temperature Selector , Discharge Air Sensor
AG31
*Temperature Selector, Discharge Air Sensor, Space
Override Thermostat
AG36
Remote Console
AG49, AG50
Control Switch, P/N 29054
*If an optional remote console is ordered, this control may have been ordered to be
mounted on the console. The console is shipped separately.
Be sure that all shipped-separate accessories for the installation are available. Shippedseparate accessories could include a roof curb, an indoor filter cabinet, an outside
air hood, a disconnect switch, a supply gas regulator, a door switch, an evaporative
cooling module, a fill and drain or freeze kit, and/or a water hammer arrestor.
Be sure that all necessary equipment, tools, and manpower are available at the
installation site.
4.0. Clearances
and
Dimensions
4.1 Clearances to Combustibles
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.
Top
Control Side*
Opposite Side
Bottom
0
0
0
0
*In order to service the system, the minimum clearance on the control side of the unit
must be equal to the width of the unit.
4.2 Dimensions
** Models ADFH 300/500
have a motor compartment
required for high
temperature discharge.
Models 300/500 with
optional vertical discharge
have same cabinet length
as the standard horizontal
discharge unit.
Form I-ADF, Page 4
4.2.1 Dimensions of Models ADF/ADFH Sizes 300 and 500
Dimensions (inches) - Illustration in FIGURE 1A (Sizes 300 and 500)
Models
A
B
C
D
E
F (inside)
G
H (inside)
J
K
M
N
P
Horizontal Discharge
ADF300
ADF500
34
47-3/4
31-1/16
44-13/16
85-13/16
85-13/16
11-27/32
12-11/16
15-5/16
17-11/16
15-15/16
14-13/16
17-1/2
16-3/8
13-3/4
16-1/8
-
ADF300
34
31-1/16
85-13/16
15-15/16
64-19/32
13-13/16
7
8-1/8
7-13/32
Vertical** Discharge
ADF500
ADFH300
47-3/4
34
44-13/16
31-1/16
85-13/16
109-1/2
14-13/16
15-15/16
62-11/32
64-19/32
16-1/16
13-13/16
8-1/8
7
21-3/4
8-1/8
7-13/32
31-3/32
ADFH500
47-3/4
44-13/16
109-1/2
14-13/16
62-11/32
16-1/16
8-1/8
21-3/4
31-3/32
Dimensions (mm) - Illustration in FIGURE 1A (Sizes 300 & 500)
** Models ADFH 300/500
have a motor compartment
required for high
temperature discharge.
Models 300/500 with
optional vertical discharge
have same cabinet length
as the standard horizontal
discharge unit.
Models
A
B
C
D
E
F (inside)
G
H (inside)
J
K
M
N
P
Horizontal Discharge
ADF300
ADF500
34
1213
789
1138
2180
2180
301
322
389
449
405
376
445
416
349
408
-
ADF300
864
789
2180
405
1640
351
178
206
188
Vertical** Discharge
ADF500
ADFH300
1213
864
1138
789
2180
2781
376
405
1584
1640
408
351
206
178
552
206
188
790
ADFH500
1213
1138
2781
376
1584
408
206
552
790
FIGURE 1A - Dimensions of Models ADF/ADFH 300 and 500 - inches (mm)

Duct Dimensions
(with and without discharge dampers)
Models
Horizontal
ADF 300/500
GxE
Models
Vertical
ADF/ADFH 300/500
FxK
NOTE: Motor for optional dampers with horizontal
discharge is externally mounted on the control side of
the damper frame. Horizontal damper frame extends
6-5/8" (168mm) beyond the duct connection on the
heater. See FIGURE 19, page 18.

M
Bottom
Discharge
Opening
Motor Compartment
Model ADFH only
Top View - Vertical Discharge
F
N
Form I-ADF, P/N 131805 R6, Page 5
4.2.2 Dimensions of Models ADF/ADFH Sizes 700 and 1200
4.0. Clearances
and
Dimensions
(cont'd)
Dimensions (inches) - FIGURE 1B
Horizontal
Vertical Discharge
Discharge
ModADF/
ADF/
ADF
els
ADFH
ADFH
Size
700/1200
700
1200
A
92-1/8
117-1/32 117-1/32
B
72-1/8
69-7/8
C
13-13/16 16-1/16
4.2 Dimensions
(cont'd)
Dimensions (mm) - FIGURE 1B
Horizontal
Vertical Discharge
Discharge
ADF/
ADF/
Models
ADF
ADFH
ADFH
Size
700/1200
700
1200
A
2340
2973
2973
B
1832
1775
C
351
408
FIGURE 1B - Dimensions of Models ADF/ADFH 700 and 1200 - inches (mm)

Duct Dimensions
(with and without discharge dampers)
Models
Horizontal
48x15/16x22-1/8
ADF 700/1200
(1243x562)
Models
Vertical
ADF/ADFH
Cx40-15/16 (Cx1024)
700/1200
NOTE: Motor for optional dampers
with horizontal discharge is externally
mounted on the control side of the
damper frame. Horizontal damper
frame extends 6-5/8" (168mm) beyond
the duct connection on the heater. See
FIGURE 19, page 18.
Form I-ADF, Page 6

5. Mounting
Mounting is the responsibility of the installer.
Depending on the building and its use, determine whether or not additional field measures
should be taken to reduce the effect of blower vibration and/or noise. Determining the
need for and installing vibration isolation is the responsibility of the installer.
When selecting a location for an outdoor installation, position the unit so that the air
inlet will NOT be facing into the prevailing wind.
Prior to installation, be sure that the method of support is in agreement with all local
building codes. For both indoor and outdoor installations, check for service platform
requirements.
5.1 Weights
Verify that the supporting structure has sufficient load-carrying capacity to support the
weight.
NOTE: Net weights are approximate for the standard cabinet, blowers, and base.
Optional equipment is not included and can add substantial weight to the figure
in the table.
Net Weight - lbs (kg)
Model
ADF
ADF
ADFH
Discharge
Horizontal
Vertical
Vertical
Size 300
700 (318)
700 (318)
790 (358)
Size 500
775 (352)
775 (352)
885 (401)
Size 700
930 (422)
1080 (490)
1080 (490)
Size 1200
950 (431)
1100 (499)
1100 (499)
5.2 Rigging
All units are mounted on a full curb cap base furnished with four lifting lugs for attaching
rigging. To prevent damage to the cabinet, use spreader bars with the rigging chains.
5.3 Mounting on
Field-Supplied
Supports
The system is equipped with a load-bearing curb cap which forms an integral part of
the unit. Whether the system is being mounted directly on a surface or being placed
"up" on additional structure, the horizontal length must be supported by two 4x4 treated
wooden rails. Refer to FIGURE 2 for the appropriate lengths and spacing. When the
system is placed on the rails, the curb cap "skirt" must fit over the edge of the boards
with the rails setting inside the horizontal length of the curb cap.
If the rails are laid directly on a surface, position them as shown in FIGURE 2. Set the
system on the rails leaving the "ends" underneath open for ventilation.
If the wooden rails are not placed directly on a surface, cross-supports should be
placed underneath the rails at the ends and at the cabinet "joint". Refer to FIGURE 3.
IMPORTANT NOTE: Mount an outdoor unit with a minimum of 14" clearance from
the bottom of the inlet air hood to the mounting surface or a minimum of 9" service
clearance from the bottom of an evaporative cooling module to the mounting surface
(Evaporative cooling module for Sizes 700 and 1200 must be mounted. Leg height
adjusts from 9" to 16". See Paragraph 6.2.4 for additional information.)
FIGURE 2 - Placement of
Mounting Rails
A
4 x 4 Treated Lumber
B
Discharge Horizontal
Vertical
Model
ADF
ADF
ADFH
Dimension A (inches)
300
85-13/16
85-13/16
109-1/2
500
85-13/16
85-13/16
109-1/2
700
92-1/8
117-1/32
117-1/32
1200
92-1/8
117-1/32
117-1/32
Dimension A (mm)
300
39
39
50
500
39
39
50
700
42
53
53
1200
42
53
53
Both
ADF/ADFH
B (inches)
31-1/16
44-13/16
55-13/16
55-13/16
B (mm)
14
20
25
25
Form I-ADF, P/N 131805 R6, Page 7
5.0 Mounting
(cont'd)
FIGURE 3 - Cross Support Mounting Requirements
5.3 Mounting on
Field-Supplied
Supports
(cont'd)
5.4 Mounting on a
Roof Curb
CAUTION: Before assembly, re-check to be sure that the correct
curb has been ordered. Be sure that the curb selected matches
the unit ordered. Verify the dimensions of the curb received with
the curb dimension table, FIGURE 4.
Installation Instructions for 16" Optional Roof Curb (Option CJ3) - Refer
to FIGURE 4
NOTE: Curb rail sections and hardware for assembling curb are provided with
optional roof curb. Insulation and flashing are field supplied.
1.Position the curb cross rails as shown in the assembly illustration in FIGURE 4.
Fasten curbing pieces with bolts and lag screws as illustrated in the corner detail.
2. Check the assembly for squareness. The curb must be adjusted
so that the diagonal measurements are equal within a tolerance of ± 1/8".
3.Level the roof curb. To ensure a good weatherproof seal between the curb cap and
the roof curb, the roof curb must be leveled in both directions with no twist end to
end. Shim as required and secure curb to roof deck before installing flashing. 4.Install field-supplied flashing.
5. Before placing the unit into position, apply furnished 1/4" x 1-1/4" foam sealant
tape to the top surface of the curb, making good butt joints at the corners. The
unit must be sealed to the curb to prevent water leakage into the curb area due to
blowing rain and capillary action.
FIGURE 4 - Optional Roof Curb (Shipped separately to be field assembled)
Curb Layout and Dimensions

Corner Detail
Curb Detail

IMPORTANT: Area enclosed by roof curb must comply with clearance to combustible
materials.If roof is constructed of combustible materials, area within curb must be either
ventilated, left open, or covered with non-combustible material which has an "R" value of
at least 5.0. If area within curb is left open, higher radiated sound levels may result.
Form I-ADF, Page 8
Model
ADF300
ADF500
Discharge
Horizontal or Vertical
Roof Curb Dimensions (inches) - FIGURE 4
A
84-9/16
84-9/16
B
29-13/16
43-9/16
C*
80-13/16
80-13/16
D*
26-1/16
39-13/16
Roof Curb Dimensions (mm) - FIGURE 4
A
2148
2148
B
757
1106
C*
2053
2053
D*
662
1011
*C and D are roof opening dimensions.
Bottom (Vertical) Duct
Connections
ADFH300
ADFH500
Vertical Only
ADF700/1200
Horizontal
Vertical
ADFH700/1200
Vertical Only
108-1/4
29-13/16
104-1/2
26-1/16
108-1/4
43-9/16
104-1/2
39-13/16
90-7/8
54-1/2
87-1/8
50-13/16
115-25/32
54-1/2
112-1/32
50-13/16
115-25/32
54-1/2
112-1/32
50-13/16
2750
757
2654
662
2750
1106
2654
1011
2308
1384
2213
1291
2941
1384
2846
1291
2941
1384
2846
1291
If the system being installed has a vertical discharge, the duct opening has flanges for
connection to field-installed ductwork. See FIGURE 5 for duct opening and spacing in
relationship to currently manufactured Reznor® roof curbs.
FIGURE 5 - Vertical Duct
Connection in Relationship
to Reznor® Roof Curb

Dimensions - inches (mm)
Model
ADF300
ADF500
ADF700
ADF1200
ADFH300
ADFH500
ADFH700
ADFH1200
A
80-13/16 (2053)
80-13/16 (2053)
112-1/32 (2846)
112-1/32 (2846)
104-1/2 (2654)
104-1/2 (2654)
112-1/32 (2846)
112-1/32 (2846)
6.0 Mechanical
B
26-1/16 (662)
39-13/16 (935)
50-13/16 (1291)
50-13/16 (1291)
26-1/16 (662)
39-13/16 (935)
50-13/16 (1291)
50-13/16 (1291)
C
4-25/32 (121)
4-25/32 (121)
28-19/32 (726)
28-19/32 (726)
28-19/32 (726)
28-19/32 (726)
28-19/32 (726)
28-19/32 (726)
D
13-13/16 (351)
16-1/16 (408)
13-13/16 (351)
16-1/16 (408)
13-13/16 (351)
16-1/16 (408)
13-13/16 (351)
16-1/16 (408)

E
5-5/8 (143)
19-1/4 (489)
5-5/16 (135)
5-5/16 (135)
5-5/8 (143)
19-1/4 (489)
5-5/16 (135)
5-5/16 (135)
F
15-15/16 (405)
14-13/16 (376)
40-5/16 (1024)
40-5/16 (1024)
15-15/16 (405)
14-13/16 (376)
40-5/16 (1024)
40-5/16 (1024)
G
4-1/2 (114)
5-3/4 (146)
5-5/16 (135)
5-5/16 (135)
4-1/2 (114)
5-3/4 (146)
5-5/16 (135)
5-5/16 (135)
6.1 Gas Piping and Pressures
All piping must be in accordance with the requirements of the National Fuel Gas Code
ANSI/Z223.1 (latest edition ). Gas supply piping installation must conform with good
practice and with all local codes.
High pressure testing of supply lines is acceptable, provided the
supply line has been disconnected from the unit and the pipe end
is capped. See Hazard Levels, page 2.
Read this section of the installation manual to determine the minimum gas supply
pressure required to provide a maximum gas capacity. Minimum gas supply pressure is
also stated on the heater rating plate. The heater manifold terminates at the gas supply
connection with a black iron pipe union. See FIGURE 6. Local codes may require a 6"
condensate trap. Gas connection is either 1", 1-1/4", or 2" depending on the size of the
system.
WARNING: All components of the gas supply system must be leak
tested prior to placing equipment in service. NEVER TEST FOR
LEAKS WITH AN OPEN FLAME.
Form I-ADF, P/N 131805 R6, Page 9
6.0 Mechanical
(cont'd)
6.1 Gas Piping and Pressures (cont'd)
Gas Supply Piping
Capacity of Piping
Cubic Feet per Hour based on 0.3" w.c. Pressure Drop
Specific Gravity for Natural Gas -- 0.6 (Natural Gas -- 1000 BTU/Cubic Ft)
Specific Gravity for Propane Gas -- 1.6 (Propane Gas -- 2550 BTU/Cubic Ft)
Diameter of Pipe
Length
3/4"
1"
1-1/4"
1-1/2"
2"
2-1/2"
3"
of Pipe
Natural Propane Natural Propane Natural Propane Natural Propane Natural Propane Natural Propane Natural Propane
20'
190
116
350
214
730
445
1100
671
2100
1281
3300
2013
5900
3599
30'
152
93
285
174
590
360
890
543
1650
1007
2700
1647
4700
2867
40'
130
79
245
149
500
305
760
464
1450
885
2300
1403
4100
2501
50'
115
70
215
131
440
268
670
409
1270
775
2000
1220
3600
2196
60'
105
64
195
119
400
244
610
372
1105
674
1850
1129
3250
1983
70'
96
59
180
110
370
226
560
342
1050
641
1700
1037
3000
1830
80'
90
55
170
104
350
214
530
323
990
604
1600
976
2800
1708
90'
84
51
160
98
320
195
490
299
930
567
1500
915
2600
1586
100'
79
48
150
92
305
186
460
281
870
531
1400
854
2500
1525
125'
72
44
130
79
275
168
410
250
780
476
1250
763
2200
1342
150'
64
39
120
73
250
153
380
232
710
433
1130
689
2000
1220
175'
59
36
110
67
225
137
350
214
650
397
1050
641
1850
1129
200'
55
34
100
61
210
128
320
195
610
372
980
598
1700
1037
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 6 - Gas Supply
Connection

*See gas
connection
location in
FIGURE 1A
or 1B.
Supply Pressure

These direct-fired makeup air systems are designed to operate on a natural gas
supply pressure range of a minimum of 6" w.c. to a maximum of 28" w.c. If the natural
gas supply pressure is above the maximum allowed, it is necessary to install a fieldsupplied step-down gas regulator in the supply line. Order and install the appropriate
Gas Regulator Kit, Option CZ1 (1") or CZ2 (1-1/2"). Follow the instructions provided
with the kit. Measure the gas pressure between the step-down regulator and the unit.
Maximum Supply Pressure by Manifold
Manifold Option BM75, BM76 - 1/2 psi
Manifold Option BM78, BM79 - 2 psi
Minimum Supply Gas Pressure for Full Fire
Manifold
BM75
BM76
Option
with Gas
AG 30, 31,
Control
AG1
AG3
32, 33, 35, 36,
Option
or 37
Manifold
1"
1"
1"
Size
MBH
Nat Pro
Nat
Pro
Nat
Pro
250
4.0
1.4
4.0
N/A
4.1
1.6
500
5.3
1.9
5.0
N/A
5.8
2.3
750
7.5
2.7
6.8
N/A
8.5
3.3
1000
----12.4
4.7
1250
------Form I-ADF, Page 10
BM78
BM79
AG 30, 31, 32, 33, 35,
36, or 37
1"
Nat
4.4
6.0
8.4
11.7
--
1-1/4"
Pro
1.6
2.3
3.3
4.6
--
Nat
4.6
5.2
6.1
7.4
9.1
Pro
1.6
1.9
2.3
2.8
3.5
Pilot Supply Pressure
These systems are designed to operate on a natural gas pilot supply pressure of 3.5"
w.c. or a propane gas pilot supply pressure of 6" w.c.
Measure both operating pressure and pilot supply pressure with the blowers in
operation.
Manifold Pressure
Manifold pressure is defined as the gas pressure as measured at the burner pressure
tap. Measure manifold gas pressure with the blowers operating. Minimum gas pressure
at the burner is typically 4.3" w.c. for natural gas or typically 1.5" w.c. for propane.
FIGURE 7 - Pressure
Tap Locations for
Measuring Manifold and
Pilot Pressure
Gas Pressure Switches
Gas pressure switches included in the gas train monitor gas pressure downstream from
the safety valves. If the gas pressure at this point on a system equipped with a high gas
pressure switch (standard with Manifolds BM 78 and 79 or optional (BP2 or BP4) with
other manifolds) exceeds the setpoint, the switch will open the electrical circuit to the
burner, stopping all gas flow. The high gas pressure switch is a manual reset device.
An optional low gas pressure switch (Option BP3 or BP4) will shutoff the gas flow if the
gas pressure drops below the setpoint of the low pressure switch. The low gas pressure
switch will automatically reset when the gas pressure rises above the setpoint.
6.2 Unit Inlet Air
6.2.1 Screened Outside Air Hood without Filters (Option AS2)
Option AS2, Screened Outside Air Hood, is a weatherized hood designed to be
field-assembled and installed around the inlet air opening. The air hood includes a
pre-assembled louver assembly designed to help eliminate moisture from the inlet air.
Complete instructions are packaged with the air hood option.
CAUTION: It is recommended that the inlet to the outside air hood
not be facing into the prevailing wind.
FIGURE 8A - Dimensions
of Outside Air Hood
Option AS2
Outside air hood is shipped
separately for field installation.
Dimensions are the same for
all sizes.
Provide 14" (356mm)
clearance from the bottom of
the air hood to the mounting
surface.

Form I-ADF, P/N 131805 R6, Page 11
6.0 Mechanical
(cont'd)
6.2 Unit Inlet Air
(cont'd)
6.2.1 Screened
Outside Air Hood
without Filters
(cont'd)
Installation Instructions
(Refer to Air Hood Assembly Drawing in FIGURE 8B. All screw ends except those
across the bottom should be inside the air hood.)
To avoid possible damage, it is recommended that the outside air hood be installed
after the unit has been placed on the roof. The air hood should be installed before the
heater is operated. Do not install the air hood while the heater or blower is in operation.
1.Install Top Panel - On the air inlet end of the cabinet, remove the row of factoryinstalled screws attaching the cabinet top. Slide the air hood top panel underneath
the edge of the cabinet top. The edge of the air hood top panel must be between
the cabinet top and end panel. Reinsert all of the sheet metal screws.
2.Install Side Panels - Slide the air hood right side panel into the slot between the
cabinet end panel and corner leg. Be sure that the side panel is underneath and
to the inside of the air hood top panel. Attach to the cabinet and the air hood top
using the required number of self-drilling sheet metal screws. Repeat with the left
side panel.
FIGURE 8B - Component P/N's and Assembly Drawing
of Option AS2, Outside Air Hood Without Filters
Size
300
500
700 & 1200
Top Panel
100228
100230
100232
Bottom Panel
100235
100237
100239
NOTE: Either a Reznor®
designed optional air inlet
hood or evaporative cooling
module is required on outdoor
installations to ensure complete
weather resistance and to retain
certification.
Louver Assy Side Panels
103774
See
103776
illustration
for P/N's.
103778

3.Install Bottom Panel - Position the air hood bottom panel so that it is to the inside
of the two side panels and above the factory-installed support angle. Attach to both
side panels.
If the bottom panel does not rest tightly against the support angle, follow these
instructions to adjust the position of the support angle:
a) Slightly loosen (do not remove) the support angle screws.
b) Slide the support angle up (holes are slotted) so that it is against the bottom
panel.
c) Tighten the screws.
Attach the support angle to the air hood bottom panel. The bottom panel of the air
hood and the support angle should be tight together; do not draw with the sheetmetal screws.
4.Install the Louver Assembly - With the intake screen toward the inside of the
hood, position the pre-assembled vertical louver assembly in the inlet opening of
the air hood. Using the remaining sheet metal screws, attach the louver assembly
to the air hood side panels using the holes provided.
6.2.2 Screened
Outside Air Hood
with Filters - Options
AS6, AS7, AS10,
AS12
Screened air hoods are available with a filter rack and 2" disposable filters, 1" or
2" permanent filters, or 2" disposable pleated filters. Screened air hoods with filters
are shipped factory-assembled for field installation. To avoid possible damage, it is
recommended that the outside air hood be installed after the unit is in its permanent
location. The dimensions are shown in FIGURE 9B.
CAUTION: It is recommended that the inlet to the outside air hood not be
facing into the prevailing wind.
Follow the instructions below to attach the outside air hood to the inlet air end of the
system cabinet.
Form I-ADF, Page 12
Instructions for installing pre-assembled outside air hood with filters:
FIGURE 9A - Optional
Screened Outside Air
Hood with Filters
1.On the inlet air end of the system, remove the row of factory-installed screws
attaching the cabinet top.
2.Tip the assembled air hood slightly and slide the top flange underneath the cabinet
top. The air hood must be between the cabinet top and the end panel. Slide the
side flanges into the slots between the corner posts and the end panel. (See
FIGURE 9A).
3. Re-insert all of the screws across the top of the cabinet.
4. The air hood bottom should be resting on the factory-installed support angle across
the bottom of the cabinet. If the bottom panel does not rest tightly against the
support angle, follow these instructions to adjust the position of the support angle:
a)Slightly loosen (do not remove) the support angle screws.
b)Slide the support angle up (holes are slotted) so that it is against the bottom
panel.
c)Tighten the screws.
5.If equipped with an optional dirty filter switch, locate the coil of clear tubing
attached to the dirty filter switch in the electrical compartment. Extend the tubing to
the air entering side of the filter rack. Attach the end of the tubing being careful that
it is not compressed or kinked. (See Paragraph 7.3 for switch details.)
Factory assembled and
shipped separately for field
installation.
FIGURE 9B Installation and
Dimensions of Outside
Air Hood with Filters
Slide the air hood top flange
underneath the cabinet top.

NOTE: Width is
the same as cabinet without filters;
see FIGURE 8A.
6.2.3 Indoor Filter
Cabinet - Options
AW3, AW6, AW13,
AW15
The optional filter cabinets are designed for field attachment to systems that are
installed indoors. The cabinet has a 1" duct flange for attachment of ductwork to bring
in outside makeup air to the system. The cabinet is available with 1" or 2" permanent,
2" disposable, or 2" pleated disposable filters. There is a filter access door on both
sides of the cabinet.
Installation Instructions: The cabinet and filter racks with filters are factory assembled
and shipped separately for attachment to the system at the job site.
1.On the inlet end of the system, remove the row of factory-installed screws
attaching the cabinet top.
2.Tip the assembled filter cabinet slightly and slide the top flange underneath the
cabinet top. (Refer to FIGURE 9B above.)
FIGURE 10 - Dimensions of Indoor Filter Cabinet
Size
300
500
700/1200
Size
300
500
700/1200
Dimensions (inches)
Dimensions (mm)
A
34-1/8
47-13/16
58-15/16
A
867
1214
1497
B
33-1/16
33-1/16
33-1/16
B
840
840
840
C* 16-13/16 16-13/16
16-13/16
C*
427
427
427
D**
31-1/4
45
56
D**
794
1143
1422
E**
30-1/2
30-1/2
30-1/2
E**
775
775
775
* Includes 1" duct flange extending perpendicular to the duct opening.
** Duct connection.
The filter cabinet flange must be between the cabinet top and the end panel. Slide
the side flanges into the slots between the corner posts and the end panel.
Form I-ADF, P/N 131805 R6, Page 13
6.0 Mechanical
(cont'd)
6.2 Unit Inlet Air
(cont'd)
6.2.3 Indoor Filter
Cabinet (cont'd)
6.2.4 Evaporative
Cooling Module Options AS4 and AS8
FIGURE 11A Factory-installed
Evaporative Cooling
Module Option on
Models ADF/ADFH 300
and 500
3.Re-insert all of the screws across the top of the cabinet.
4.The filter cabinet should be resting on the factory-installed support angle across
the bottom of the cabinet. If the cabinet does not rest tightly against the support
angle, follow these instructions to adjust the position of the support angle:
a) Slightly loosen (do not remove) the support angle screws.
b) Slide the support angle up (holes are slotted) so that it is against the bottom
panel.
c) Tighten the screws.
5.If equipped with an optional dirty filter switch, locate the coil of clear tubing attached
to the dirty filter switch in the electrical compartment. Extend the tubing to the air
entering side of the filter rack. Attach the end of the tubing being careful that it is not
compressed or kinked. (See Paragraph 7.3 for switch details.)
Evaporative cooling provides excellent comfort cooling at low initial equipment and
installation costs and low operating and maintenance costs. Direct evaporative
cooling works on the principles that water in direct contact with a moving airstream
will eventually evaporate if the droplets have long enough exposure and that the
evaporation will lower the air temperature.
The optional evaporative cooling module is equipped with high efficiency pad media
of either 12" rigid cellulose or 12" rigid glass fiber. 12" media provides 90% efficiency.
Efficiency value is stated at maximum allowable CFM (without the optional moisture
elimination pad) and with an inlet dry bulb temperature of 95°F and an inlet wet bulb
temperature of 65°F. Evaporative cooling efficiency is a function of inlet temperature
(wet and dry bulbs) and of face velocity through the pads. The stated cooling efficiency
will rise with the decrease of velocity and increase of inlet temperature. Moisture
elimination pads (Option ASA1) may be used on all units but are required on high CFM
units (velocity above 6000 FPM) as listed in the table below.
Model/Size
ADF/ADFH 300
ADF/ADFH 500
ADF/ADFH 700
ADF/ADFH 1200
Moisture Elimination Pad Required Size
on the Evaporative Cooling Module at
3200 CFM
4500 CFM
11200 CFM
11200 CFM
Models ADF/ADFH 300/500 - When ordered with an evaporative cooling option, Sizes
300 and 500 are shipped as a factory-assembled makeup air heating/evaporative
cooling system. The module is factory installed including all wiring connections (See
FIGURE 11A). Follow the instructions in this section for water connections and water
flow adjustments.
FIGURE 11B Dimensions of optional
evaporative cooling
module factory-installed
on Sizes 300 and 500

Models ADF/ADFH 700/1200 - The evaporative cooling module for Sizes 700 and
1200 is assembled at the factory and shipped separately for field-connection to the
makeup air system cabinet. The shipped separate option includes the cooling module,
Form I-ADF, Page 14
FIGURE 12 - Optional
Evaporative Cooling
Module on an ADF/
ADFH 700 or 1200.
Assembled module is
shipped separately for field
installation.
an adjustable base, and the transition ductwork between the cooling module and the
cabinet. Complete installation instructions including dimensions are packaged with the
evaporative cooling module package.
Included in the cooling module installation
booklet is a preparation checklist. All items
in that checklist should be addressed prior
to beginning installation of the evaporative
cooling module. Four of those items are Adjustable Leg Height
16" maximum; 9" minimum
listed below.

Make certain the roof or platform is
capable of handling the additional load of a full cooling module reservoir.
Wts of Evaporative Cooling Module w/ Wet Media & Full Reservoir
Module with 12" rigid cellulose media (Option AS4).. 431 lbs (196 kg)
Module with 12" rigid glass fiber media (Option AS8) 514 lbs (233 kg)

Make certain the roof is level and free of debris where the cooling module will be
mounted.

Do not mount directly on soft tar roofs where the legs could sink and tilt the cooling
module. Provide a weather-resistant, solid wood or metal base under the cooling
module support legs.

Make certain that there will be adequate clearance between the bottom of
the reservoir and the roof (or platform) to allow for drain and overflow pipe
connections.
All Sizes - If an optional fill and drain kit is part of the installation, the kit is shipped
separately. Connect the fill and drain kit as illustrated in FIGURE 14.
Evaporative Cooling
Module Water
Connections and
Adjustments
WARNINGS: Water reservoir must be drained and pump motor
turned off when outside temperature falls below 32°F. Pump must
never be operated without water in the reservoir. See Hazard
levels, page 2.
Supply and Drain Water Connections
Float Valve (FIGURE 13) - In a module with pump and float controls, a float valve
maintains the appropriate water level in the reservoir.
Use a field-supplied 1/4" diameter tubing with a compression nut and tubing ferrule to
connect the fresh water supply to the inlet of the float valve. See FIGURE 13. Place nut
and ferrule over tubing and insert tubing into the float valve stem. Tighten nut securely.
FIGURE 13 - Connect
Fresh Water Supply to
Inlet of Float Valve
(Inside the
Cabinet)
Float
Valve
Rod
Compression Nut
and Tubing Ferrule
Use 1/4" Tubing for
Fresh Water Supply
Simulates Cabinet
Side Panel
AquaSaver® Timed Metering Control System - If the cooling module is equipped
with an optional timed metering system, connect a 1/2" water line to the fitting on the
side of the cooling module.
Due to various water pressures and installation conditions, the water supply line may
bang abruptly when the solenoid valve in the AquaSaver system closes. This banging
can be minimized by installing an optional water hammer arrestor in the supply line. If
installing an optional water hammer arrestor, select an indoor (above 32°F) location,
either horizontal or vertical, in line with and as close to the solenoid valve as possible.
Follow the manufacturer's instructions to install and maintain the water hammer
arrestor.
Form I-ADF, P/N 131805 R6, Page 15
6.0 Mechanical
(cont'd)
6.2 Unit Inlet Air
(cont'd)
6.2.4 Evaporative
Cooling Module Options AS4 and AS8
(cont'd)
Supply and Drain Water Connections (cont'd)
All Cooling Modules - A manual water shutoff should be installed upstream of the
inlet, at a convenient non-freezing location, to allow the water supply to be turned on
and off. If necessary, install a bleed line between the manual valve and the cooling
module inlet to allow drainage of the line between the shutoff valve and the cooling
module.
All cooling modules are equipped with an overflow and drain fitting. The fittings are
in the cabinet bottom and come complete with a locknut and a sealing gasket. Check
these fittings for tightness before installing the overflow and drain piping. The drain and
overflow fitting will accommodate a 3/4" garden hose thread and is tapped with a 1/2"
female pipe thread for iron pipe.
An optional automatic fill and drain kit (Option CT1) is available that will automatically
release supply water to the cooling module when a call for cooling is made and will
drain all water from the reservoir when the cooling switch is deactivated or a cooling
thermostat is satisfied. See FIGURE 14. If installing an optional fill and drain kit, follow
the instructions. Consult the wiring diagram for electrical connections.
FIGURE 14 - Water
Connections including
Optional Drain and Fill
Kit
Instructions for Installing Optional Fill & Drain Kit
NOTE: Follow this part of the instructions included in the valve packages for attaching valves to the water line only. The remainder of the
instructions with the valves do not apply to this type of application.
Water Line Connections (See illustration)
Supply (3-Way Valve) Connections - connect
the water supply line to "B" (normally closed).
Connect the water drain line to "A" (normally
open). Connect the middle outlet to supply
the water to the cooling module reservoir.
Drain (2-Way Valve) Connections - Connect
the drain pipe from the reservoir to "A".
Connect the outlet side to "B" and connect
into drain lines from the cooling reservoir and
the supply valve.
WARNING: Risk of electrical
shock. Disconnect the power.

Electrical Connection (requires black and
white 14-gauge wires) - Refer to furnace
wiring diagram:

1. Refer to the wiring diagram for terminal connections (NOTE: If kit is not ordered with the system, connections will not be
shown on the diagram. Terminal connections are specific to each system. Contact the factory for terminal connections. Be
prepared to provide all model information.)
2. Run field-supplied black wire from the electrical compartment (terminal on the wiring diagram) of the evaporative cooling
module and connect to the black wire on both the 3-way and the 2-way valve.
3. Run field-supplied white wire from the electrical compartment (terminal on the wiring diagram) of the evaporative cooling
module and connect to the white wire on both the 3-way and the 2-way valve.
FIGURE 15 - Bleed Line Fitting
Thread
bleed line
fitting (hose
barb) into
the adapter;
attach a
1/4" hose.
Form I-ADF, Page 16
Bleed Line Connection (Does not apply to module with optional timed
metering system.) - Shipped in the evaporative cooling module bottom
pan, find a 1/4" I.D. x 1/2" N.P.T. nylon bleed line fitting (hose barb). Thread
the fitting into the female adapter located opposite the pump/inlet side of
the water distribution line. The hose barb will protrude from the side of the
cabinet (FIGURE 15). Attach a 1/4" I.D. hose to the barb and run the hose to
the nearest drain.
Discharging a quantity of water by "bleed off" will limit the concentration of
undesirable minerals in the water being circulated through the cooling module.
Minerals buildup because evaporation only releases "pure water vapor" causing
the concentration of contaminants in the water to increase as the evaporation
process continues to occur. The minerals accumulate on the media, in the
water lines, on the pump, and in the reservoir. Adequate bleed off is important to
maintaining an efficiently operating evaporative cooling system.
Filling & Adjusting
the Water Level in the
Reservoir
Float and Pump Control System -- Turn on the water supply. Check for good flow.
When the float valve (FIGURE 13) shuts off the water supply, measure the water
depth. The depth of the water should be approximately 3". It may be necessary to
adjust the float valve to obtain the proper water level or to free the float valve from
obstructions. To adjust the float valve, simply bend the rod upward to raise the water
level or downward to decrease the water level.
Adjusting Water Flow Over Pads
Proper water flow over the evaporative cooling media is critical to extend the life and
maintain the efficiency of the pads. Follow the instructions to adjust water flow.
FIGURE 16 - Disconnect
the power and adjust
the water flow with the
ball valve.
CAUTION: Do not flood the media pads with extreme quantities of water
for long periods as this will cause premature breakdown of the media.
An even flow from top to bottom of the media with the least amount of
water is all that is required to assure maximum efficiency and media life
span. More water does not provide more evaporation or more cooling.
Ball
Valve
Float and Pump Control System - Using the ball valve, located in the middle of the
length of hose running from the pump to the distribution line inlet (FIGURE 16), adjust
the valve handle to allow the flow to completely dampen the media pads from top to
bottom.
Operate the unit watching the water flow. After 15 minutes with the blower in operation,
the water should have completely dampened the pads but should not be flowing off the
entering side of the media. If water is flowing off the entering side of the media, turn the
system off, disconnect the power, and reduce the entering water flow.
AquaSaver® Timed Metering Control System - Check water flow and pad wetting
time at maximum air flow and wet bulb depression to assure complete wetting of the
media at the extreme operating conditions.
In addition to adjusting water flow, the timing of the water on/off cycle can be adjusted.
Water flow and timing adjustments are correct when l) the water rises from the holes
in the sprinkler pipe (See FIGURE 17) consistently along the entire pipe length, 2) the
media pads wet evenly after a few "ON" cycles (no dry spots or dry streaks), and 3) a
slight amount of excess water collects at the drain at the completion of the "ON" cycle.
1) AquaSaver® Water Flow Adjustment - Using the ball valve illustrated in FIGURE
16, adjust the water flow depending on the pad height.
WARNING: Adjust
ball valve only
when the power is
disconnected from
the system. Failure
to do so can cause
electrical shock,
personal injury, or
death.
FIGURE 17 - Adjust
Water Flow with the Ball
Valve in FIGURE 16
Pad Height A = Water rise from PVC Sprinkler Pipe
24"
1/8" to 1/2"
48"
1/4" to 1/2"
2) AquaSaver® Timer Adjustment - At any given temperature, the media pads should
completely wet from top to bottom during the ON cycle. The micro-processor has three
pre-set timing settings based on media size. The appropriate setting is selected by
changing the position of the suitcase jumper at J2 on the micro-processor (FIGURE
18). Remove the cover and check the setting.
FIGURE 18 - AquaSaver® Micro-processor Control
If the jumper is at the appropriate location for the media, replace the cover. If the
jumper needs to be moved, move it to the
appropriate setting. The setting will go into
effect when the power is restored.
Check the "ON" timing; the media pads
should be wet from top to bottom during
the ON cycle.
If the pre-set timing is not suitable for the
application, follow the instructions supplied
with the micro-processor to change the
calibration of the ON and/or OFF cycle.
Form I-ADF, P/N 131805 R6, Page 17
6.0 Mechanical
(cont'd)
6.3 Supply Air
Discharge
6.3.2 Two-Position
Discharge Dampers,
Option AQ4
FIGURE 19 - Model
ADF with Horizontal,
Two-Position Discharge
Damper, Option AQ4
Form I-ADF, Page 18
6.3.1 Distribution of Makeup Air
Makeup air can be introduced to the building either through distribution ducts or through
controlled pressurization with little or no ductwork. Makeup air should be introduced
and maintained using the lowest possible air velocity. With ductwork distribution, this
is accomplished using a multiplicity of discharge openings over the greatest centerline
distance. When a makeup air system is automatically controlled to maintain a set
building pressure, the entering air will travel naturally toward the relief areas at the
perimeter walls using the building structure as the distribution ductwork.
Makeup air should enter at the highest point practical. By doing this, the fresh air will
entrain dust laden air at the ceiling and move it toward the point of exhaust. Also, fresh
air directed downward from the roof or ceiling will mix with hot ceiling air resulting in
improved distribution of heat in the building.
Always introduce fresh makeup air so that it moves across the greatest distance within
the room or building before reaching an exhauster.
Sizing and Installation of Distribution Ductwork - Proper sizing of warm air ductwork
is necessary to ensure a satisfactory heating installation. The recognized authority
for such information is the Air Conditioning Contractors Association, 2800 Shirlington
Road, Suite 300, Arlington, VA 22206 (www.acca.org). A manual covering duct sizing
in detail may be purchased directly from them.
Installing Ducts (See Paragraph 4.2 for duct connection dimensions.):

The type of duct installation depends in part on the type of construction of the
roof (wood joist, steelbar joist, steel truss, pre-cast concrete, etc.) and the ceiling
(hung, flush, etc.).

Rectangular ducts should be constructed of not lighter than No. 26 U.S. gauge
galvanized iron or No. 24 B&S gauge aluminum.

All duct sections 24" or wider, and over 48" in length, should be cross-broken on
top and bottom and have seams or angle-iron braces. Joints should be S and drive
strip or locked.

Warm air ducts should not contact masonry walls. Insulate around all air ducts
through masonry walls with not less than 1/2" of insulation.

Insulate all exposed warm air ducts passing through an unheated space with at
least 1/2" thickness of insulation.

Duct Supports - Suspend all ducts securely from adjacent building members. Do
not support ducts from unit duct connections.

Duct Connections - At the heater, use a flexible canvas connection on indoor
units to eliminate vibration transmission. On outdoor installations, the ducts can
be slid over the flange of the heater and then sealed for an airtight and watertight
fit. On duct-to-heater connections, use sheetmetal screws to fasten ducts to the
heater flange. Use stiffening flanges around the perimeter of the duct connections.
A Model ADF unit ordered with Option AQ4 has a factory installed horizontal
open/closed discharge damper. The direct-coupled damper motor is rated for low
ambient temperature and is externally mounted on the control side of the damper
frame. The horizontal damper frame extends 6-5/8" (168mm) beyond the heater duct
connection as illustrated in FIGURE 19.
The two-position (open/closed) vertical discharge damper (Option AQ3)
is available on both Model ADF and
ADFH. Discharge dampers are open
when the unit is operating and are
closed when the unit is shut down.
6.4 Blowers, Drives,
and Blower
Motors
FIGURE 20 - Belt
Tension
Check belt tension. Proper belt tension is important to the long life of the belt and motor.
A loose belt will cause wear and slippage. Too much tension will cause excessive
motor and blower bearing wear. If adjustment is required, adjust belt tension by means
of the adjusting screw on the motor base until the belt can be depressed 1/2" or 3/4"
(FIGURE 20). Be sure the belt is aligned in the pulleys.
Motor Pulleys and Blower Speed - Units are set at the factory for the RPM required
to meet the CFM and external static pressure specified on the order. If the estimated
external static is incorrect, or changes are made to the duct system, the blower RPM
may have to be changed. Motors are equipped with adjustable pitch pulleys which
permit adjustment of blower speed. Instructions are included in Paragraph 9.2, Startup,
for adjusting blower speed.
Blower Rotation - Each blower housing is marked for proper rotation. Checking blower
rotation is included in Startup, Paragraph 9.2
Motor Loads - Use an ammeter to check motor amps. Amps may be adjusted
downward by reducing blower RPM or by increasing duct system static pressure. The
open motor amp chart below can be used for sizing line wiring. For accurate amps,
read the motor manufacturer's rating plate; amps will vary depending upon type of
motor and motor manufacturer.
HP
1/2
3/4
1
1-1/2
2
3
5
7-1/2
10
15
20
7.0 Electrical and
Wiring
7.2 Supply Wiring
115/1
8.8
11
13
15
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Blower Motor Full Load Amps (open motors)
230/1
208/3
230/3
460/3
4.4
2.1
2
1
5.5
2.9
2.6
1.3
7.5
3.7
3.2
1.6
7.5
5.6
5
2.7
N/A
7
6.6
3.3
N/A
9.1
8.4
4.2
N/A
13.4
13.2
6.6
N/A
22
21
10.5
N/A
30
26
13
N/A
43.1
39
19.5
N/A
58.7
53
26.5
575/3
--1.4
2
2.4
3.6
5.4
8.4
10.4
16
21.2
7.1 General
All electrical wiring and connections including electrical grounding MUST be completed
in accordance with local, state and national codes and regulations and with the
National Electric Code (ANSI/NFPA 70) or in Canada the Canadian Electrical Code
Part 1 C.S.A. C.22.1.
Wire Gauge Sizes - 100 ft maximum
FLA
5
10
15
Wire Gauge
14
14
12
20
10
25
8
30
8
35
6
40
6
Run a separate line voltage supply directly from the building electrical panel to the
disconnect switch for the system. All external wiring must be within approved conduit
and have a minimum temperature rise rating of 60°C. For motor load amps, check the
motor nameplate.
Specific wiring diagrams and complete instructions are packed with each unit and
should be kept readily accessible in legible condition.
Disconnect Switch - A safety disconnect is required. An outdoor installation requires
a weatherproof disconnect switch. Install either an optional UL-listed disconnect or a
field-supplied equivalent. Install the disconnect switch in accordance with Article 430 of
the National Electrical Code ANSI/NFPA 70 or in accordance with Canadian Electrical
Code Part 1-C.S.A. Standard C22.1. When attaching the disconnect switch to the
heater, use hardware with "teeth" to provide electrical grounding. The "teeth" should
face the disconnect switch, scratching off the painted surface. Attach the disconnect
tightly against the heater cabinet. (Refer to FIGURE 21.)
When providing or replacing fuses in a fusible disconnect switch, use dual element
time delay fuses and size 1.25 times the maximum total input amp as stated on the unit
rating plate.
Form I-ADF, P/N 131805 R6, Page 19
7.0 Electrical and
Wiring (cont'd)
7.2 Supply Wiring
(cont'd)
CAUTION: Supply voltage and 24-volt control wiring cannot be
installed in the same conduit. Maxitrol systems will be adversely
affected if control wiring is in conduit with supply voltage wiring. If
required, field-supplied wiring between any Maxitrol components
must be completed with shielded wiring.
FIGURE 21- Disconnect
Switch Location and
Wiring Connection
Locations (Model ADF
is illustrated; same
dimensions/locations
apply to Model ADFH)

7.3 Control Wiring
Refer to FIGURE 21 for location of control wiring connection. Low voltage wiring must
be in individual conduit, separated from primary high voltage wiring.
A 3-position control switch is supplied with each system, either packed loose inside the
unit, or if an optional control console is ordered, the switch is mounted on the console.
Control wiring requirements depend on the options selected. Follow the custom wiring
diagram supplied with the system to connect any remote controls. For additional
reference, the control manufacturer's instructions are included in the owner's envelope.
Volts
24
24
24
Remote Console
Control Wiring Maximum Lengths - ft (M)
Wire Gauge
Total Wire Length Distance from Unit to Control
18
150 (45.7)
75 (22.9)
16
250 (76.2)
125 (38.1)
14
350 (106.7)
175 (53.3)
The optional remote console is shipped separately. Remote consoles include terminal
blocks for wiring. If ordered with a remote console, the toggle switch is mounted on
the console and depending on what gas control option was ordered, the console could
include a temperature selector. If a dirty filter switch is ordered the indicator light is on
the console. See FIGURE 22 for console size.
Control Qty of Temperature
Switch Lights* Selector**
FIGURE 22 - Remote
Console Dimensions
(Dimensions, components,
and wiring required depend
on options selected; refer
to the wiring diagram to
identify options.)
Form I-ADF, Page 20
Yes
3
Yes
Yes
3
No
Yes
4
Yes
Yes
4
No
Dimensions - inches (mm)
L****
10-3/4
(273)
10-3/4
(273)
15-3/4
(400)
15-3/4
(400)
H****
7-5/8
(194)
7-5/8
(194)
7-5/8
(194)
7-5/8
(194)
D
2-5/8
(67)
2-5/8
(67)
2-5/8
(67)
2-5/8
(67)
* 3 - Blower On, Burner On, and Safety Lockout on both
RC13 and RC14; 4th light is Dirty Filter Indicator on
Option RC14 only
** On the console with Gas Control Options AG 31, 32,
33, or 35
**** Subtract 1" (16mm) when recessing
Locations of Knockout Holes
(dimensions to
centerlines
of holes)
Dirty Filter Light
(on the Remote
Console)
When a console with a dirty filter indicator is selected, the remote console includes a
fourth light (dirty filter indicator light). The light is activated by an adjustable, singlepole/normally open differential pressure switch that senses air pressure across the filter
bank. There are field-installation procedures that must be done for proper operation of
the dirty filter indicator light.
Dirty Filter Switch Installation Instructions

Before the system is operating, connect the sensing tubes from the switch to
their sensing locations in the field-installed filter cabinet.
1)Run the tubes through the holes in the cabinet wall. Pull gently to extend the
tubing to its entire length without stress.
2)Position the tubing approximately at the center of the height of the filter rack.
3)Identify the tube connected to the positive connection on the switch (FIGURE
23) as the positive pressure tube. Determine the length of tubing required to
attach the positive pressure tube so that it will sense pressure at the inlet
side of the filter rack.
Identify the tube connected to the negative connection on the switch (FIGURE
23) as the negative pressure tube. Determine the length of tubing required to
attach the negative pressure tube so that it will sense the pressure at the
blower side of the filter rack.
(NOTE: Tubing shipped is the same length for all sizes of systems; cut to the
appropriate length for the smaller systems.)
4)If required, cut the tubing to the proper lengths. Using the clamps provided,
attach the ends of the tubing to the filter rack at about center height being
careful not to kink or compress the tubing.

After the system is operating, the filter switch must be manually set. With
clean filters in place, blower doors closed, and blower in operation, increase the
pressure setting by adjusting the set screw on the switch clockwise until the filter
light is energized or the screw is bottomed out. At that point, adjust the set screw
three full turns counterclockwise or until the screw is top ended. At that setpoint,
the filter light will be activated at approximately 50% filter blockage.
FIGURE 23 Dirty Filter
Pressure Switch
Negative pressure connection
is toward the "front or top" of
the switch (senses blower side
of filters)
Positive pressure connection is toward the
"back or bottom" of the switch (senses air
inlet side of filters)
8.0 Controls
Discharge
Sensor
and
Mixing
Tube
Set screw (on front
of switch) must be
manually adjusted after
system is in operation.
Discharge Temperature Sensor (Maxitrol) for Gas Control Options AG30,
AG31, AG32, AG33, and AG36
A discharge sensor may be shipped separately for field installation. Attach the discharge
sensor and mixing tube in the ductwork about six feet (1.8 M) from the discharge
opening of the system.
The sensor housing is not waterproof. If the installation is outdoors, field-fabricate a
waterproof protective enclosure for the discharge sensor, being careful not to affect its
air temperature sensing capability.
Refer to the wiring diagram and connect the sensor to the terminal strip in the blower
section electrical box. Use shielded wire to alleviate any electrical interference that my
cause an erroneous discharge temperature reading.
Outside Air Cutoff Control (Option BN2)
After sensing pilot flame, the burner ignites at its lowest input rate. The "amount
of heat" required to reach the desired discharge temperature also depends on the
Form I-ADF, P/N 131805 R6, Page 21
8.0 Controls
(cont'd)
Control used for
Outside Air Cutoff and
Discharge Low
Temperature Limit
(Freezestat)
temperature of the incoming outside air. The outside air cutoff (high ambient control) is
factory set at 60°F (adjustable 25-250°F). The burner reacts differently depending on
the entering air temperature and the setting on this control. The burner -• may not ignite (pilot valve will not open);
If the actual temperature of the outside air is above the setpoint on the outside air
control, the burner will not ignite.
• may modulate to satisfy discharge setting;
• may shutdown; or
Burner shutdown or modulating operation will depend on the temperature rise
between the outside air and the discharge air setting.
• may remain on continuous low fire.
If the outside air control is set too high, the burner will continuously burn on low fire
as long as the control switch is set to "winter".
When the outside air control is set properly for the climate, the system blower will
continue to provide the required makeup air (ventilation) at the ambient outdoor
temperature (burner not operating) even when the control switch is set to "winter".
If at startup, it is determined that the outside air cutoff control is not set properly,
change the setting on the control (located in the main electrical compartment) and test
for proper operation.
Discharge Temperature Low Limit (Option BE2)
If the system has an optional low limit switch for discharge temperature (freezestat), the
control is in the blower section electrical box. The sensing bulb must be field-mounted
in the blower discharge duct connector. Uncoil the control and extend the bulb to the
blower discharge, being careful to not interfere with any mechanical parts. Use the bulb
holder provided and mount the sensor according to the manufacturer's instructions.
Door Switch (Option BX1)
Optional
Door Switch
Optional
Firestat
If the system is to be used as an overhead door heater, an optional door switch (Option
BX1) must be installed. The function of the switch is to energize and interlock the
system when an outside overhead door reaches approximately 80% of full open travel.
The switch will de-energize the system when the overhead door closes approximately
20%. Follow the installation instructions in the door switch option package and the
wiring diagram.
Firestat (Option BD5)
If the system has an optional firestat, the control is shipped separately for field
installation. Mount it on the discharge ductwork so that the sensor extends into the duct.
This control requires manual reset so should be installed in an accessible location.
Follow the manufacturer's instructions and the wiring diagram to mount the firestat and
connect the wires in the blower section electrical box. The firestat is a manually reset
control; check reset when starting the unit.
Optional Field-Provided Computer Control (with Option AG37 only)
If the system includes Gas Control Option AG37, the gas valve and burner modulation
are controlled by a field-supplied 0-10VDC or 4-20 milliamp computer signal.
Follow the signal conditioner manufacturer's instructions included with the system for
connecting to the field-provided control.
9.0 Commissioning 9.1 Checks Before Startup
1. Check to be sure that all field-installed accessories are installed. If equipped with
and Startup
an optional dirty filter switch, check that the sensor tubing shipped in the unit is
extended through the filter rack and attached correctly.
2. Check all field-installed wiring.
3. Check all ductwork for obstructions; open all diffusers.
4. Turn the remote three-position switch or optional summer/off/winter remote
console switch to OFF position. To prevent someone from turning the system on,
tape the switch leaving a note that it should be left in the OFF position.
5. Check Disconnect Switch -Turn disconnect switch OFF.
Form I-ADF, Page 22
Check disconnect switch to be sure that it is tightly secured against the cabinet.
If disconnect is fusible, check that fuses are installed. If fuses are not installed,
insert correct fuses. Verify continuity of fuses.
6. Open the hinged gas/electrical control compartment door -Close all manual gas valves.
Open hinged electrical panel cover.
Check all wiring and wiring connections on gas controls and electrical components.
If equipped with any manually reset devices such as a firestat limit switch, or high
gas pressure switch, reset devices.

FIGURE 24 - Control Locations

7. Open the hinged blower compartment door -Remove any blocking and shipping supports.
Check all fasteners for tightness and all parts to be sure they are secure.
Rotate the blower wheel to be sure that no parts are rubbing. Check for and
remove any obstructions and/or foreign material that may damage the blower
wheel.
Check that the blower belts have correct tension (See Paragraph 6.4) and that
pulleys are in alignment and locked to the shaft.
Remove the cover from the limit switch junction box; reset manual limit switch.
Check wiring connections to limit switch, discharge air sensor, and motor.
Close blower compartment door panel; secure latches.
8. Turn ON gas supply valve and manual shutoff valve on the manifold -Leak test gas connections upstream of the electric gas valve. Be sure all
connections are tight and leak tested. WARNING: DO NOT TEST WITH OPEN
FLAME.
Turn OFF manual gas valves.
Form I-ADF, P/N 131805 R6, Page 23
9.0 Commisoning
and Startup
(cont'd)
9.2 Startup
Diagnostic
Lights
1. Prepare system for startup testing -Attach a slope gauge (0 to 1.0" scale) to the tubing connections in the control
compartment. The two connections are located just left of the electrical box.
Remove the caps on the 1/8" NPT test connections and attach the slope gauge.
(The recommended method for attaching the slope gauge is to use field-supplied
1/8" female NPT x 1/4" OD barbed hose connections.)
Connect a "U" tube manometer to the main burner pressure tap
Set BOTH the blower and burner service switches (located on the electronic circuit
board) to the OFF position.
2. Observe status lights on the electronic circuit board (assuming an optional
control relay is installed) -Turn ON power to the system at the disconnect switch.
Check the electronic circuit board. One light should be lit - "Control Power".
Turn OFF the disconnect switch.
If the system has an optional relay (check wiring diagram), remove the wire from
Terminal 3 and Terminal 4 that connects the circuit to the optional "control relay"
contacts. Place a jumper wire from that Terminal 4 to empty Terminal 3.
Turn ON the disconnect switch. One or two lights should be lit - "Control Power" plus if equipped with a firestat - "Firestat Normal"
3. Check blower switch and blower rotation.
Place the blower switch (on the electronic circuit board) in TEST position. This will
bring on one or two additional lights - "Starter Energized" - and if equipped with a
freezestat - "Freezestat Normal".
NOTE: If unit is equipped with a discharge damper, the damper will begin to open.
When the damper reaches 80% open, the blower motor will be energized and
then the "Starter Energized" light will be actuated. After the blower obtains
normal speed (minimum .2" positive air pressure), the low air proving switch will
close and the following lights will be energized: "Low Air Pressure Normal";
"Limit Controls Normal"; and if these options are included, "High Air Pressure
Normal"; "Outside Air Cutoff Normal"; "Low Gas Pressure Normal"; "High
Gas Pressure Normal".
Check blower rotation. If blower is turning backwards (see rotation arrows), do the
following.
(A) Turn disconnect switch OFF and:
Single-phase units - rewire the motor per instructions on the motor plate.
Three-phase units - interchange any two motor leads at the motor contactor or starter.
(B) Turn disconnect switch ON and verify correct blower rotation.
Check blower operation to be sure there is no excessive vibration. If excessive
vibration is present, re-check belt tension, pulley alignment, bearing alignment,
blower wheel balance, and that components are attached securely. Determine and
eliminate the cause of excessive vibration before the system is put into operation.
4. Measure burner differential air pressure on the slope gauge Measure burner
differential air pressure on the slope gauge (connected to the unit in Startup
Step 1) .
(A) If the system includes an optional discharge damper, before measuring burner
differential air pressure, check that the damper is fully open.
(1) Turn the disconnect switch OFF.
(2) Vertical Discharge - On the control side of the unit, open blower door.
(3) Horizontal or Vertical Discharge - Check damper. If not fully open, adjust damper to the fully open position.
(4) Vertical Discharge - Close the door panel and secure the latches.
(5) Turn ON the disconnect switch.
(B)With the blower operating, the pressure differential on the slope gauge should
read between .25" and .75" w.c. If the slope gauge reading is within those limits,
no adjustment is necessary. If the slope gauge reading is not within these limits, do
the following:
□□
□□
□□
□□
□□
□□
□□
□□
Form I-ADF, Page 24
If the slope gauge reading is greater than -.25" (such as -.10"
w.c.), adjust the drive to increase the blower speed.
(1) Turn disconnect switch OFF.
(2) For systems with smaller than 7-1/2 HP motor
(a) Loosen belt tension and remove belt.
(b) Loosen the set screw on the side of the pulley away from
the motor.
(c) Turn adjustable half of the pulley inward to increase
blower speed. One turn of the pulley will change speed 8
to 10%.
(d) Tighten the set screw on the flat portion of the pulley
shaft.
For systems with 7-1/2 HP and larger motor
(a) Slack off all belt tension by moving the motor toward
driven shaft until the belts are free of grooves. For easiest
adjustment, remove the belts from the grooves.
(b) On the outer locking ring, locate the two locking screws
that are directly across from each other. Loosen, but do
not remove, those two screws. Do not loosen any other
screws.
(c) Adjust sheave to desired pitch diameter by turning the
outer locking ring. One complete turn of the outer locking
ring will result in .233" change in pitch diameter. To
increase blower speed, decrease diameter.
CAUTION: Do not adjust sheaves in either direction to
the point where moveable and stationary flanges are in
contact.
(d) Re-tighten the locking screws.
All Motor Sizes - Replace the belts and check belt tension. Be
sure that belts are aligned in the pulley grooves and are not
angled from pulley to pulley.
If the slope gauge reading is less than -.75" (such as -1.0"
w.c.), adjust the drive to decrease the blower speed.
(1) Turn disconnect switch OFF.
(2) For systems with smaller than 7-1/2 HP motor
(a) Loosen belt tension and remove the belt.
(b) Loosen the set screw on the side of the pulley away from
the motor.
(c) Turn the adjustable half of the pulley outward to
decrease blower speed. One turn of the pulley will
change speed 8% to 10%.
(d) Tighten the set screw on the flat portion of the pulley
shaft.
For systems with 7-1/2 HP and larger motor
(a) Slack off all belt tension by moving the motor toward
driven shaft until the belts are free of grooves. For easiest
adjustment, remove the belts from the grooves.
(b) On the outer locking ring, locate the two locking screws
that are directly across from each other. Loosen, but do
not remove, those two screws. Do not loosen any other
screws.
(c) Adjust sheave to desired pitch diameter by turning the
outer locking ring. One complete turn of the outer locking
ring will result in .233" change in pitch diameter. To
decrease blower speed, increase diameter.
CAUTION: Do not adjust sheaves in either direction to
the point where moveable and stationary flanges are in
contact.
(d) Re-tighten the locking screws.
All Motor Sizes - Replace the belts and check belt tension. Be
sure that belts are aligned in the pulley grooves and are not
angled from pulley to pulley.
(C) Turn ON the disconnect switch and re-check the slope gauge. If air pressure differential is within the limits of
.25" to .75" w.c., no further adjustment is required. If the air pressure differential is not within the limits, re-adjust the
blower speed.
(D) When the differential air pressure is within the limits, check the motor amp draw with an ammeter to be sure that
the motor is not overloaded. Amps are shown on the motor nameplate.
(E) If an inlet or outlet duct system is attached to the heater, run the blower to purge the volume of air from the duct
system with at least four air changes.
(F) If the system includes an optional dirty filter light, while the blower continues to operate, set the switch so that
the indicator light (on the remote console) will activate at approximately 50% filter blockage. Calibrate the switch to
this measurement by turning the set screw on the switch clockwise until the filter light is energized or the screw is
bottomed out. At that point, adjust the set screw three full turns counterclockwise or until the screw is top ended. At
this setting the contacts will close causing the light to signal that the filters require cleaning at approximately 50%
blockage.
(G) Turn the disconnect switch OFF. Disconnect the manometer and the slope gauge. Replace caps removed to
connect the slope gauge and the plug in the gas pressure tap.
5. Check pilot and burner ignition -Turn the disconnect switch ON. (Lights as explained in Startup Steps 2 and 3 should be energized). Put the burner
switch (on the electronic circuit board) in TEST position. After 15-20 seconds, the "Pilot Valve" light will light to
signal the pilot ignition, followed by the "Main Valve" light signaling main burner operation. All lights should be lit
except "System Switch" (12 lights total).
With both the burner and blower operating, measure the gas pressure at the burner. Gas pressure should match
the required manifold pressure listed on the rating plate. (If pressure does not match the required pressure, further
testing is required in Step 7.) Remove the manometer.
Leak test all connections in the pilot and main burner supply lines. WARNING: DO NOT TEST WITH OPEN
FLAME.
Turn OFF the manual gas valve. Wait 30 seconds for unit to cool. Return both burner and blower switch to OFF
position. Turn OFF disconnect switch.
Form I-ADF, P/N 131805 R6, Page 25
9.0 Commissioning
and Startup
(cont'd)
9.2 Startup (cont'd)
6. Check pilot pressure and operation -To check pilot gas pressure, connect a "U"-tube manometer to the pressure tap on
the downstream side of the pilot solenoid valve.
Put BOTH blower and burner switches in TEST position. Turn ON disconnect
switch. After blower reaches speed, all lights should be lit except "Pilot Valve" and
"Main Valve". Turn on the gas supply. After 15-20 seconds, the "Pilot Valve" light
will be energized, followed by the "Main Valve" light.
Measure pilot gas pressure. Pilot pressure for natural gas should be 3.5" w.c.;
propane gas should be 6" w.c. Pilot pressure should be correct, but if the pressure
is not correct, discontinue startup until the pilot gas pressure is regulated correctly.
(To adjust pilot pressure, remove the cap from the regulator. Turn adjustment
clockwise to increase gas pressure or counterclockwise to decrease gas
pressure.) When pressure is correct, shut off the gas, remove the manometer, and
replace the pressure tap cap on the pilot solenoid valve.
To check lockout feature of the pilot ignition system, turn pilot manual shutoff valve
OFF. Pilot should lockout after two trials for ignition. To reset unit, cycle the main
disconnect switch.
7. Verification of inlet gas pressure -If, with the blower and burner operating, the main inlet gas pressure measured in
Step 4 does not correspond to the minimum stated on the rating plate, check the
main burner inlet gas pressure. If the main inlet gas pressure is lower than that sated
on the rating plate, full burner firing will not be achieved. Check main gas supply
service regulator for adjustment.
Turn disconnect switch OFF.
Re-connect the "U"-tube manometer to the main burner pressure tap.
Turn pilot manual shutoff valve back ON.
Turn the disconnect switch ON; ignition sequence will occur.
Observe the main burner; light off should occur along the entire length of the
burner. After approximately one minute, record the gas pressure reading on the
manometer.
Calculate the required burner differential gas pressure. Differential gas pressure is
the figure used when determining minimum gas supply pressure. Add differential
gas pressure plus the drop in gas pressure as it flows through the gas train (See
Paragraph 6.1) to determine the minimum required supply pressure of inlet gas.
For maximum firing rate, a minimum of 4.3" w.c. of actual measured natural gas
pressure is required at the burner (If maximum firing is not required divide the
actual input rate by the maximum rate, square the answer, and multiply by 4.3"
w.c. to determine the required gas pressure at less than maximum capacity.)
Turn disconnect switch OFF. If the gas pressure is determined to be adequate,
continue with the startup of the system. If the gas pressure is not adequate for the
system, discontinue startup until the gas pressure problem is resolved.
Remove the manometer and replace the plug.
9.3 Startup for
Continuous
Operation
If connected in Startup Step 2, remove the jumper wire running from Terminal 3
to Terminal 4. Re-connect the optional "control relay" contacts to Terminal 3 and
Terminal 4.
Put BOTH the burner and blower switches in RUN position.
Close the electrical box and close the control door panel. Secure latches.
Turn ON the disconnect switch. The system is now operational from the control
switch, the remote console, and/or other type of optional automatic control.
9.4 After Startup
Return this manual to the owner's envelope. Keep for future reference.
To check for toxic vapors coming from the surrounding outside atmosphere or
being produced by the installation, it is recommended that the tempered makeup
air entering the building be tested at its point of discharge from the heating unit.
The table below shows limits for various substances including carbon monoxide.
Certified, portable detector tubes may be used; follow the manufacturer's
instructions.
Form I-ADF, Page 26
Limits Based on Eight -Hour Exposure and a 5-Day Week (Guide Only)
Substance............... Percent.... PPM
Substance............... Percent.... PPM
Acetaldehyde........... .001............... 10
Formaldehyde.......... .000025...... 0.25
Carbon Dioxide........ .250........... 2500
Nitrogen Dioxide...... .0001............... 1
Carbon Monoxide.... .001............... 10
Sulphur Dioxide....... .00005.......... 0.5
Note: At 100°F rise the CO2 concentration will be in the order of 2500 ppm.
DANGER: The gas burner in this direct gas-fired system is designed and equipped to provide
safe, complete combustion. However, if the installation does not permit the burner to receive the
proper supply of combustion air, complete combustion may not occur. The result is incomplete
combustion which produces carbon monoxide, a poisonous gas that can cause death.
Always comply with the combustion air requirements in the installation codes and operating
instructions. The amount of air over the burner must be within the specified range. The
burner profile plates are set at the factory to match CFM requirements. Do not adjust
the burner profile plates without contacting the factory. FAILURE TO PROVIDE PROPER
COMBUSTION AIR CAN RESULT IN A HEALTH HAZARD WHICH CAN CAUSE PROPERTY
DAMAGE, SERIOUS INJURY, AND/OR DEATH. A direct-fired installation must provide for air
changes as required by the applicable installation codes.
Index
B
Belt Tension 19
Blower Rotation 19
C
Clearances 4
Field-Provided Computer Control 22
Contact 28
Control Locations 23
D
Diagnostic Lights 24
Dimensions 4, 6
Dirty Filter Ligh 21
Dirty Filter Switch 21
Discharge Dampers 18
Discharge Temperature Low Limit 22
Disconnect Switch 19
Distributor 28
Door Switch 22
Drain and Fill Kit 16
Duct Connections 9
E
Evaporative Cooling Module 14
F
Indoor Filter Cabinet - 13, 14
Firestat 22
G
Gas Piping and Pressures 9
Gas Pressure Switches 11
Gas Supply Connection 10
Gas Supply Piping 10
H
HAZARD INTENSITY LEVELS 2
Hazard Labels 2
Hood with Filters 12
I
Inlet Air 11
Inspecting 4
Installation Codes 3
INSTALLATION RECORD 28
Installer 28
L
Location 3
M
Makeup Air 18
Manifold Pressure 11, 19
Model 28
Motor Loads 19
Mounting 7
O
Optional Screened Outside Air Hood without Filters 11
Outside Air Cutoff Control 21
R
Remote Console 20
Rigging 7
Roof Curb 8
S
Discharge Temperature Sensor 21
Serial No. 28
Shipped-Separate Components 4
Startup 22
Startup for Continuous Operation 26
Supply Pressure 10
Field-Supplied Supports 7
U
Uncrating 4
W
Warranty 3
Weights 7
Control Wiring 20
Supply Wiring 19
Indoor Filter Cabinet - 13
Additional
References
See your Factory Distributor for the following forms:
• Operation/Maintenance/Service - Form O-ADF/RDF (P/N 148385)
• Replacement Parts - Form P-ADF/ADFH (P/N 270068)
• Replacement Valves & Ignition Controls by Serial No. Code - Form P-VALVES (P/N 263995)
Form I-ADF, P/N 131805 R6, Page 27
INSTALLATION RECORD - to be completed by the Installer:
Installer:
Name
________________________________________________________
Company ________________________________________________________
Address
________________________________________________________
________________________________________________________
________________________________________________________
_________________________________
Phone
Distributor (company from which the unit was purchased):
Company
________________________________________________________
Contact ________________________________________________________
Address
________________________________________________________
________________________________________________________
________________________________________________________
_________________________________
Phone
Model ________________ Serial No.______________________________Date of Installation ____________
SPECIFIC INSTALLATION NOTES: (i.e. Location, Amps, Gas Pressure, Temperature, Voltage, Adjustments,
Warranty, etc.)
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
BUILDING OWNER OR MAINTENANCE PERSONNEL:
For service or repair
• Contact the installer listed above.
• If you need additional assistance, contact the Distributor listed above.
• For more information, contact your Factory Representative.
Specifications & illustrations subject to change without notice and without incurring obligations.
©Nortek Global HVAC, LLC 2015. All rights reserved.
All marks are the property of their respective organizations.
O’Fallon, MO I Printed in U.S.A. (12/15)
Form I-ADF (12-15), PN 131805R6
Form I-ADF, Page 28

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