Reznor OH Installation and operating instructions

Revision: I-OH (01-20) PN120390R7
OIL-FIRED UNIT HEATER INSTALLATION, OPERATION,
AND MAINTENANCE
Supersedes: I-OH (07-16) PN120390R6
MODEL OH
⚠ WARNING ⚠
FIRE OR EXPLOSION HAZARD
• Failure to follow safety warnings exactly could result in serious injury or property damage.
• Installation and service must be performed by a qualified installer, service agency, or the gas
supplier.
• 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 neighbor’s phone. Follow the gas suppliers
instructions.
• If you cannot reach your gas supplier, call the fire department.
DO NOT DESTROY. PLEASE READ CAREFULLY. KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.

2I-OH (01-20) PN120390R7
TABLE OF CONTENTS
REFERENCES.........................................................................................................................................................3
GENERAL INFORMATION......................................................................................................................................4
Important Safety Information .............................................................................................................................4
Warranty...............................................................................................................................................................4
Fuel Specifications..............................................................................................................................................5
Installation Codes ...............................................................................................................................................5
Clearances ...........................................................................................................................................................6
Dimensions..........................................................................................................................................................6
Weights ................................................................................................................................................................7
Air Throw ..............................................................................................................................................................7
INSTALLATION........................................................................................................................................................7
Location Selection ..............................................................................................................................................7
Unpacking Unit ....................................................................................................................................................8
Unit Mounting ......................................................................................................................................................8
Suspension Mounting .....................................................................................................................................8
Optional Heater Stand Mounting ....................................................................................................................9
Mechanical Connections ....................................................................................................................................9
Fuel Tanks .........................................................................................................................................................9
Pipe Tubing .......................................................................................................................................................9
Shutoff Valves.................................................................................................................................................10
Oil Filter ..........................................................................................................................................................10
Piping System Selection ...............................................................................................................................10
One-Pipe Supply with Standard Single-Stage Burner Pump .....................................................................10
Two-Pipe Supply with Standard Single-Stage Burner Pump or Optional Two-Stage Pump ...................11
Loop System ..................................................................................................................................................12
Pressurized System.......................................................................................................................................13
Boost Pump Assembly (Option DA1 or DA2) ..............................................................................................13
Boost Pump Pressure Switch (Option DF1, Shipped Separately).............................................................15
Oil Solenoid Valve (Option DD1, Shipped Separately)................................................................................15
Oil Safety Valve (Option DC1, Shipped Separately) ....................................................................................15
Check Valve ....................................................................................................................................................15
Venting and Combustion Air ............................................................................................................................15
Chimney..........................................................................................................................................................15
Barometric Draft Regulator (Option DB1)....................................................................................................17
Draft Inducer Relay (Option DH1).................................................................................................................17
Outside Combustion Air Intake Adapter Kit (Option DE1, Shipped Separately)......................................17
Electrical Connections......................................................................................................................................18
Electrical Connection Requirements ...........................................................................................................18
Electrical Connections for Optional Equipment .........................................................................................18
Supply and Line Wiring .................................................................................................................................18
Wiring Diagrams.............................................................................................................................................19
Electrodes and Nozzle...................................................................................................................................20
Thermostat Wiring..........................................................................................................................................21

3
I-OH (01-20) PN120390R7
Table 1. Related Technical Manuals Available from Factory Distributor
Type Form PN*
Replacement parts P-OH 272437
Replacement fan/blower controls and limit controls P-FAN&LIMIT 147678
Optional draft booster relay installation I-OIL-DBR 110781
Optional vertical louver installation I-OIL-VL 122408
*Also available at www.reznorhvac.com.
REFERENCES
TABLE OF CONTENTS—CONTINUED
OPERATION ..........................................................................................................................................................22
Major Component Descriptions.......................................................................................................................22
Motors .............................................................................................................................................................22
Burner Pump ..................................................................................................................................................22
Fan and Limit Controls ..................................................................................................................................23
Primary Control System ................................................................................................................................23
Blocked Vent Switch (CSA Models Only).....................................................................................................23
Pre-Startup Checklist........................................................................................................................................23
Startup Checklist...............................................................................................................................................24
Adjustments.......................................................................................................................................................26
Burner Pump Pressure Adjustment .............................................................................................................26
Burner Pump Vacuum Adjustment ...............................................................................................................27
Electrode Adjustment....................................................................................................................................27
MAINTENANCE.....................................................................................................................................................27
Maintenance Requirements..............................................................................................................................27
Maintenance Procedures..................................................................................................................................27
Clean Combustion Chamber/Heat Exchanger and Flue Pipe ....................................................................27
Clean End Cone .............................................................................................................................................29
Service Oil Nozzle and Spark Electrodes ....................................................................................................30
Clean Exterior Surfaces of Combustion Chamber/Heat Exchanger and Clean Fan Assembly ..............31
Troubleshooting ................................................................................................................................................31
Oil Burner Troubleshooting...........................................................................................................................32
Primary Control Troubleshooting .................................................................................................................34
High Temperature Limit Troubleshooting.....................................................................................................35

4I-OH (01-20) PN120390R7
GENERAL INFORMATION
The instructions in this manual apply to yhe Reznor model OH oil-fired unit heater, which has a propeller fan for air
delivery and requires a vent with a barometric draft regulator.
This unit has been tested for capacity and efficiency so as to provide many years of safe and dependable comfort
providing it is properly installed and maintained. With regular maintenance, this unit will operate satisfactorily year
after year. Abuse, improper use, and/or improper maintenance can shorten the life of the appliance and create
unsafe hazards.
To achieve optimum performance and minimize equipment failure, it is recommended that periodic maintenance
be performed on this unit. The ability to properly perform maintenance on this equipment requires certain tools and
mechanical skills.
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.
Important Safety Information
There are warning labels on the unit and throughout this manual. Please read all information in this manual thoroughly
and become familiar with the capabilities and use of your appliance before attempting to operate or maintain this
unit. Pay attention to all dangers, warnings, cautions, and notes highlighted in this manual. Safety markings should
not be ignored and are used frequently throughout to designate a degree or level of seriousness.
DANGER: A danger statement describes a potentially hazardous situation that if not avoided, will result in severe
personal injury or death and/or property damage.
WARNING: A warning statement describes a potentially hazardous situation that if not avoided, can result in severe
personal injury and/or property damage.
CAUTION: A caution statement describes a potentially hazardous situation that if not avoided, can result in minor
or moderate personal injury and/or property damage.
NOTE: A note provides important information that should not be ignored.
⚠ DANGER ⚠
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 ⚠
This appliance is not designed for use in hazardous atmospheres containing flammable vapors,
combustible dust, or chlorinated or halogenated hydrocarbons.
⚠ CAUTION ⚠
Do not tamper with the unit or its controls. Call your service person.
Warranty
Refer to the limited warranty information on the warranty card in the owner’s envelope. The warranty is void if:
a. Wiring is not in accordance with the diagram furnished with the heater.
b. Heater is operated in presence of chlorinated vapors.
c. Ducts are attached to fan models.

5
I-OH (01-20) PN120390R7
Fuel Specifications
The burner in this oil-fired heater is designed and orificed for use with #2 fuel oil (140,000 BTU/gallon) at 100 psig.
Substitute fuels may be used as follows:
•#1 fuel oil: 132,000 BTU/gallon
•Kerosene (domestic only—do not use foreign): 132,000 BTU/gallon
•#1 diesel fuel: 132,000 BTU/gallon
•#2 diesel fuel: 140,000 BTU/gallon
⚠ WARNING ⚠
Do not use gasoline, crankcase oil, or any oil containing gasoline. Do not use aviation fuel.
⚠ CAUTION ⚠
Do not attempt to burn paper or garbage in this heater.
NOTE:
Due to higher viscosity, the BTU/gallon capacity of some #1 oils may be 128,000–130,000
BTU/gallon. Check the BTU content of substitute fuel to determine burner input, which is as follows:
• Unit size 095 burns an average of 0.85 gallons per hour.
• Unit size 140 burns an average of 1.25 gallons per hour.
• Unit size 190 burns an average of 1.65 gallons per hour.
Installation Codes
In the US: model OH units intended for installation in the US have a UL logo on the rating plate. In the US, the
installation must be in accordance with the following:
•Standard for the Installation of Oil Burning Equipment NFPA 31
•National Electrical Code NFPA 70
•Requirements of inspection authorities having jurisdiction
In Canada: model OH units intended for installation in Canada have a CSA logo on the rating plate. In Canada, the
installation must be in accordance with the following:
•CSA Standard B139: Installation Code for Oil Burning Equipment
•CSA Standard C22.1: Canadian Electric Code, Part 1
•Requirements of local regulatory authorities
NOTE: This heater is for commercial or industrial use only and should be installed by a trained
installer who is thoroughly familiar with the installation of oil-fired appliances. Prior to installation,
the installer should become familiar with the heater and its particular installation requirements.

6I-OH (01-20) PN120390R7
Dimensions
Dimensions for the unit are shown in Figure 1 and listed in Table 3.
Table 2. Clearances
Unit Surface
Top Front Sides Rear Bottom Flue Pipe
Required Clearance (Inches (mm))
2 (51) 48 (1219) 18 (457) 24 (610) 6 (152) 18 (457)
Figure 1. Dimensions (Refer to Table 3)
GENERAL INFORMATION—CONTINUED
Clearances
⚠ WARNING ⚠
Clearances apply to ALL combustibles. DO NOT leave paper, rags, or any combustible near the
heater.
Clearance (refer to Table 2) to combustibles is defined as the minimum distance from the heater to a surface or object
so as to ensure that a surface temperature of 90°F above the surrounding ambient temperature is not exceeded. The
heater should be suspended at a height so that the heat exchanger cannot be touched. Clearance is also required
at the sides of the heater for servicing the unit.
NOTE: For additional information on installation clearances, refer to CAN/CSA-B139, Installation
Code for Oil Burning Equipment (paragraph 8, Installation Clearances).

7
I-OH (01-20) PN120390R7
Weights
Table 3. Dimensions
Unit Size
Alphabetic Designation (See Figure 1)
ABCD
Inches (mm)
095 8 (203) 17-3/8 (441) 33 (838) 7 (178)
140, 190 9-1/2 (241) 37-3/8 (949) 43 (1092) 8 (203)
Air Throw
Table 4. Weights
Unit Size
095 140 190
Pounds (kg)
290 (132) 345 (156) 345 (156)
Table 5. Air Throw
Unit Size
095 140 190
Feet (Meters)*
50 (15.2) 65 (19.8) 65 (19.8)
*Listed values are for a heater installed at a mounting height of 9 feet (2.7 meters).
INSTALLATION
Location Selection
The unit should be installed so as to derive maximum efficiency and minimum heat loss to the outside environment.
As a rule, suspend a single heater over an area of low heat loss with the output air directed toward the area of
greatest heat loss (refer to Table 5). Where two or more heaters are used in a common installation, arrange the
heaters around the outside walls and blowing parallel to them. Heaters may be arranged in a supporting consecutive
air pattern so that the output of one heater blows beneath the air-intake side of another. In installations where there
are concentrated heat loss areas, a combination of single and multiple arrangements is desirable. Figure 2 shows
recommended heater arrangements.
Figure 2. Recommended Heater Arrangements
Narrow Building
- Single units arranged to compensate for heat loss from four exposed outside walls.
Wider Building - Single units
arranged to compensate for heat
loss from four exposed outside
walls.

8I-OH (01-20) PN120390R7
INSTALLATION—CONTINUED
Unpacking Unit
⚠ CAUTION ⚠
To prevent damage to the painted cabinet, it is recommended that the crate bottom be left in place
until after the unit has been suspended.
NOTE:
• A cleaning rake base is included with all units. If the heater is being installed in Canada, a
barometric draft regulator (option DB1, shipped separately) is required.
• The installation could also include a variety of other shipped-separate options. Ensure that all
optional components to be used in the installation are at the job site.
• The unit was inspected and tested at the factory prior to crating and was in operating condition
at that time.
Immediately upon uncrating the unit, check for any damage that may have occurred during shipping. If any damage is
found, immediately 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 Reznor, LLC.
Unit Mounting
⚠ CAUTION ⚠
The unit must be level for proper operation.
The unit may be suspended or mounted on an optional workbench fuel tank (option OT) and heater stand (option
HS). Ensure that adequate clearances (refer to Table 2) are available to accomodate the heater’s dimensions (refer
to Table 3).
Suspension Mounting
Hang the heater as follows.
⚠ DANGER ⚠
• To prevent injury,death,or equipment damage,before suspending the heater,check the supporting
structure to ensure that it has sufficient load-carrying capacity to support the weight (refer to
Table 4) of the heater.
• Before lifting the heater into place, ensure that the lifting device is rated to adequately supprt
the weight of the heater.
• Do not place on or add additional weight to the suspended heater.
NOTE: Units manufactured before OCT 1994 are suspended using 3/8-inch rods and hardware.
1. Attach suitable lifting device to heater and lift it into position.
2. To suspend heater using 1/2-inch threaded rod, lock four threaded rods using washers and nuts as shown in Figure
3, DETAIL A. To suspend heater using optional swivel connectors (option CK10) and field-provided 1inch threaded
pipe, lock four threaded pipes using swivel connectors, washers, and nuts as shown in Figure 3, DETAIL B.
3. Remove shipping crate bottom from heater.
4. Remove shipping crate angle clips from heater and reinstall screws into heater cabinet.
5. Remove lifting device from heater.

9
I-OH (01-20) PN120390R7
Figure 3. Suspension Mounting
Optional Heater Stand Mounting
Mount the heater using the optional workbench fuel tank (option OT) and heater stand (option HS) as follows:
1. Position tank in accordance with tank instructions.
2. Assemble heater stand in accordance with stand instructions.
3. Position and secure heater on stand in accordance with stand instructions.
Mechanical Connections
⚠ DANGER ⚠
Prior to entering enclosures such as vaults or pits, where pumps and accessories are installed,
provide for adequate ventilation.
Fuel Tanks
•Oil tanks must be installed in accordance with all local regulations and the National Board of Fire Underwriters or
CSA Standard.
•All oil tanks must include a vent pipe to the outdoors. The lower end of the vent pipe should not extend more than
1 inch below the uppermost point of the tank. The vent pipe terminal should be weatherproof and clog-proof.
•Installation of the fuel tank and piping is the responsibility of the installing contractor.
Pipe Tubing
•All piping shall be standard full weight black iron pipe with standard fittings or approved brass or copper tubing,
with UL-listed fittings.
•All piping shall be protected from possible injury and shall be rigidly fastened. Where practical, it should be buried
underground or in a concrete floor or placed in a metal-covered pipe trench. If installed above ground, the pipe
must be insulated to avoid freezing.
•Pipe joints and connections shall be made tight and only unions and tube fittings of an approved type shall be used.
•Use only pipe thread compound resistant to oil. Do not use TEFLON® (a registered trademark of E.I. DuPont de
Nemours and Company) tape or TEFLON®-based pipe dope.
•Do not cover the piping until the burner has been installed and operated so that any leaks may be detected and
corrected.
•For connecting the burner to the tank, use at least 1/2-inch iron pipe or 3/8-inch OD copper tubing (1/2-inch OD
copper tubing is preferred) having a wall thickness of not less than 0.049-inch.
DETAIL A
1/2 ″ Threaded Rod
Flat Washer
Hex Nut
Locknut
Locknut
1″ Standard Pipe
Swivel Assembly
Flat Washer
DETAIL B

10 I-OH (01-20) PN120390R7
INSTALLATION—CONTINUED
Mechanical Connections—Continued
Shutoff Valves
•Install a readily-accessible manual shutoff valve at each point to properly control the flow of fuel in normal operation
and where required to avoid oil spillage during servicing. The valve should close against the supply. If the heater
will not be operating for an extended period of time, close the shutoff valve.
•Where a shutoff is installed in the discharge line of an oil pump that is not an integral part of a burner, connect a
pressure relief valve into the discharge line between the pump and the shutoff valve and arrange to return surplus
oil to the supply tank or to bypass it around the pump unless the pump includes an internal bypass.
•Any fuel oil line that incorporates a heater shall be provided with a relief valve arranged to discharge to the
return line when any valve, pump, or other device may prevent the release of excessive pressure because of the
expansion of the oil when heated.
•Where oil is supplied to a burner that requires uniform flow by gravity feed and a constant level valve is not
incorporated in the burner assembly or the oil is not supplied by an automatic pump, install a constant level valve
in the supply line at the gravity tank or as close as practical, to ensure uniform delivery of oil to the burner. The
vent opening of the constant level valve should be connected by piping or tubing to the outside of the building
unless the constant level valve is provided with an anti-flooding device. Do not connect the vent piping or tubing
of constant level valves to tanks or tank vents.
Oil Filter
•Install a UL-listed (US) or CSA/USC (Canada) oil filter of generous capacity between the tank shutoff valve and
the burner.
•For ease of servicing, locate the filter and shutoff valve close to the oil burner.
Piping System Selection
Piping system selection depends on the application. The following four methods of piping fuel to an oil-fired heater
are recommended for specific installation conditions:
•one-pipe supply with the standard single-stage burner pump
•two-pipe supply with either the standard single-stage burner pump or an optional two-stage burner pump
•loop and pressurized systems require an additional booster pump for oil delivery and are used when installing
more than one heater
One-Pipe Supply with Standard Single-Stage Burner Pump
•The standard burner is equipped with a single-stage, 3,450-RPM pump with the lift capacity shown in Figure 4.
Figure 4. One-Pipe Supply System

11
I-OH (01-20) PN120390R7
•Refer to Table 6 for the maximum horizontal line length with a one-pipe supply system. Fittings, valves, and
filters reduce the total line length allowed. Check the component manufacturer’s information for equivalent length
reductions required to compensate for pressure loss.
•A one-pipe supply system must be absolutely airtight or else leaks and/or loss of prime may result.
•Bleed the line (refer to Startup Checklist section) for 15 seconds after last air is seen from easy-flow bleed valve
to ensure that the line is air-free.
Two-Pipe Supply with Standard Single-Stage Burner Pump or Optional Two-Stage Pump
•A two-pipe supply system may be used with the standard burner pump or with an optional two-stage pump (option
BZ1).
•The two-stage pump provides dual pumping gears.
•Install the two-pipe supply system (see Figure 5) as follows:
a. Remove 1/4-inch plug from return line port and insert 1/16-inch bypass plug (shipped with burner pump).
b. Connect inlet and return lines.
c. Terminate return line 3 to 4 inches (76 to 102 mm) above supply line inlet.
•In the following formula for determining lift in Table 6, Firing Rate = 0.085 for unit size 095, 1.25 for unit size 140,
or 1.35 for unit size 190:
ℎ=6 feet −(0.75 × )
(0.0086 for 3/8" tubing or 0.00218 for 1/2" tubing) × (  in GPH)
Table 6. Maximum Horizontal Line Length for One-Pipe Supply System
Unit
Size
Pipe Size
(Inches)
Lift (Feet (Meters))
0 (0.0) 1 (0.3) 2 (0.6) 3 (0.9) 4 (1.2) 5 (1.5) 6 (1.8) 7 (2.1) 8 (2.4)
Maximum Horizontal Line Length (Feet (Meters))
095 3/8 822 (251) 719 (219) 616 (188) 514 (157) 411 (125) 308 (94) 205 (62) 103 (31)
0 (0)
1/2 3158 (963) 2763 (842) 2368 (722) 1974 (902) 1579 (481) 1184 (361) 789 (240) 395 (120)
140 3/8 556 (169) 486 (148) 417 (127) 347 (106) 278 (85) 208 (63) 139 (42) 69 (21)
1/2 2222 (677) 1944 (593) 1667 (508) 1389 (423) 1111 (339) 833 (254) 556 (169) 278 (85)
190 3/8 423 (129) 370 (113) 317 (97) 264 (80) 211 (64) 158 (48) 106 (32) 53 (16)
1/2 1667 (508) 1458 (444) 1250 (381) 1042 (318) 833 (254) 625 (191) 417 (127) 208 (63)
Figure 5. Two-Pipe Supply System
•Refer to Table 7 for the maximum horizontal line (return and supply) length with a two-pipe supply system.

12 I-OH (01-20) PN120390R7
Table 7. Maximum Horizontal Line Length for One-Pipe Supply System
Pipe Size
(Inches)
Lift (Feet (Meters))
0
(0.0)
1
(0.3)
2
(0.6)
3
(0.9)
4
(1.2)
5
(1.5)
6
(1.8)
7
(2.1)
8
(2.4)
9
(2.7)
10
(3.0)
11
(3.3)
12
(3.6)
13
(3.9)
14
(4.2)
16
(4.8)
18
(5.4)
Maximum Horizontal Line Length (Feet (Meters))
Standard Single-Stage Pump
3/8 84
(25.6)
77
(23.5)
71
(21.6)
65
(19.8)
59
(18.0)
52
(15.8)
46
(14)
40
(12.2)
34
(10.3)
27
(8.2)
21
(6.0)
15
(4.5)
9
(2.7) —
1/2 100
(30.5)
99
(30.1)
98
(29.8)
97
(29.5)
96
(29.3)
95
(29.0)
94
(28.6)
93
(28.3)
92
(28.0)
91
(27.7)
90
(27.4)
89
(27.1)
71
(21.6)
49
(14.9)
27
(8.2) —
Optional Two-Stage Pump
3/8 93
(28.3)
88
(26.8)
83
(25.3)
78
(23.8)
73
(22.2)
68
(20.7)
63
(19.2)
58
(17.7)
52
(16.0)
47
(14.3)
42
(12.8)
37
(11.3)
32
(9.8)
27
(8.2)
22
(6.7)
11
(3.4) —
1/2 100
(30.5)
99
(30.1)
98
(29.8)
97
(29.5)
96
(29.3)
95
(29.0)
94
(28.6)
93
(28.3)
92
(28.0)
91
(27.7)
90
(27.4)
89
(27.1)
88
(26.8)
87
(26.5)
86
(26.2)
84
(25.6)
58
(17.7)
Loop System
NOTE: If a 2-foot rise cannot be maintained, use the pressurized system.
•The loop piping system (see Figure 6), a supply system for multiple-unit installations, uses the standard single-
stage burner pump and an optional boost pump (option DA1 or DA2) and should not be operated at line pressures
greater than 3 psi at the first burner supplied.
Figure 6. Loop Supply System for Multiple-Unit Installations
•The boost pump supplies fuel oil in excess of burner requirements from the supply tank to individual heaters. The
fuel oil is returned to the supply tank.
INSTALLATION—CONTINUED
Mechanical Connections—Continued
Two-Pipe Supply with Standard Single-Stage Burner Pump or Optional Two-Stage Pump—Continued

13
I-OH (01-20) PN120390R7
•The boost pump operates full time during the heating season and must run continously.
•All manifold and feeder lines must run in a horizontal plane at an elevation above the fuel intakes of the units.
Extend feeder lines downward to fuel burner intakes.
Pressurized System
•The pressurized system (see Figure 7) uses a boost pump to supply fuel oil to a manifold with branch lines that
supply each heater. The end of the manifold is capped, and the system is operated at a pressure not exceeding
3 psi at the first burner supplied.
Figure 7. Pressurized Supply System for Multiple-Unit Installations
•BTU output is determined by boost pump capacity and by the subsequent number of burners that can be supplied
adequately by fuel oil. For example, a 30-GPH booster pump will sustain eighteen 1.65-GPH burners.
•An optional solenoid valve is recommended to protect burner pump seal against excessive pressure. Optional
pressure switch monitors nozzle pressure and will start booster pump on pressure fall.
•Boost pump operation in a pressurized system may be continuous or may be intermittent when optional pressure
switches are used.
Boost Pump Assembly (Option DA1 or DA2)
•The boost pump is equipped with a motor and is supplied with a two-stage fuel unit that incorporates a regulator
valve and strainer.
•The regulator valve acts as a check to prevent the loss of oil supply between the boost pump and the burner, thus
assuring instantaneous starts following shutdown periods. The regulator valve also prevents excessive pressures.
•The complete assembly with the motor is approximately 15 inches long × 7-1/2 inches high × 6-3/4 inches wide
(381 × 191 × 171 mm). The dimensions for the boost pump mounting bracket are shown in Figure 8.
Figure 8. Boost Pump and Mounting Bracket
Boost Pump Bracket
Mounting Dimensions
(Bottom View)
Boost Pump

14 I-OH (01-20) PN120390R7
INSTALLATION—CONTINUED
Mechanical Connections—Continued
Boost Pump Assembly (Option DA1 or DA2)—Continued
•The maximum height from boost pump to burner is 35 feet (10.7 meters).
•Refer to Table 8 for the maximum horizontal line length for boost pump piping.
•See Figure 9 for boost pump wiring.
Table 8. Maximum Horizontal Line Length for Boost Pump Piping
Boost Pump to Burner(s)
Boost
Pump
Option
GPH
Line Size
1/2-Inch OD Tubing 1/2-Inch Pipe 3/4-Inch Pipe
Maximum Horizontal Line Length (Feet (Meters))
DA1 30 175 (53.3) 300 (91.4) 1800 (548.6)
DA2 70 50 (15.2) 100 (30.5) 600 (182.9)
Oil Supply to Boost Pump
Boost
Pump
Option
GPH
Line Size
1/2-Inch OD Tubing 5/8-Inch OD Tubing 1/2-Inch Pipe
Lift (Feet (Meters))
0–7 (0.0–2.1) 10 (3.0) 15 (4.6) 0–7 (0.0–2.1) 10 (3.0) 15 (4.6) 0–7 (0.0–2.1) 10 (3.0) 15 (4.6)
Maximum Horizontal Line Length (Feet (Meters))
DA1 30 64 ( 19.5 ) 49 ( 14.9 ) 24 ( 7.3 ) 100 ( 30.4 ) 100 ( 30.4 ) 65 ( 19.8 ) 100 ( 30.4 ) 100 ( 30.4 ) 100 ( 30.4 )
DA2 70 44 ( 13.4 )34 ( 10.4 )17 ( 5.2 )100 ( 30.4 )95 ( 29 )48 ( 14.6 )100 ( 30.4 )90 ( 27.4 )65 ( 19.8 )
Figure 9. Boost Pump Wiring
Continuous Operation
(Loop System)
Intermittent Operation
(Pressurized System)

15
I-OH (01-20) PN120390R7
Boost Pump Pressure Switch (Option DF1, Shipped Separately)
•The bost pump pressure switch is used for intermittent boost pump operation in a pressurized system. One is
required for each burner. The switch is specifically designed for fuel oil and includes a 1/8” male pipe thread
connector and screw terminals.
•The switch is a low-voltage, normally-open type that closes at approximately 50 psi.
•The maximum allowable pressure is 150 psi.
•A manual switch, for initial starting (or continuous operation) is recommended for installation in the low-voltage circuit.
•Pressurized piping systems must not exceed 3 psi. An oil solenoid valve (option DD1) is recommended at each
unit to prevent seal damage should the pressure for any reason exceed the maximum of 3 psi.
Oil Solenoid Valve (Option DD1, Shipped Separately)
•Use of the optional solenoid valve is recommended with the pressurized oil delivery system.
•The solenoid valve is designed to operate simultaneously with the burner motor.
Oil Safety Valve (Option DC1, Shipped Separately)
•The Oil Safety Valve (OSV) is opened by the slight vacuum created by the burner pump. The OSV closes when
the vacuum condition subsides to prevent siphoning of the supply line and to eliminate spills if any leaks develop
downstream from the OSV.
•Use of the optional OSV is highly recommended.
Check Valve
•The check valve prevents reverse flow of oil maintaining static head pressure between the check valve and the
automatic valve on the burner, thus preventing siphoning.
•Check valves are field-provided and are not needed when an OSV (option DC1) is used.
Venting and Combustion Air
⚠ DANGER ⚠
• Failure to provide proper venting could result in death, serious injury, and/or property damage.
• The unit must be connected to a flue that has sufficient draft to ensure safe and proper operation.
• The unit must be properly vented to the outside of the building.
• Safe operation of any gravity-vented heating equipment requires a properly-operating vent system,
correct provision for combustion air, and regular maintenance and inspection.
• Exercise care to ensure that an adequate supply of combustion air is available and free to enter
the air openings on all units.
• Openings equal to 1 inch square per each 1,000 BTUh should be used to allow combustion air
to enter the room where the heater is installed.
Chimney
• Masonry chimneys and metal chimneys: must be built in accordance with accepted building code practice.
Standards for chimneys can be found in NFPA Standard No. 211, published in National Fire Codes, Volume 4;
the National Building Code of the American Insurance Association, New York, NY; ULC Standards for chimneys;
or the National Building Code of Canada published by the National Research Council, Ottawa. A class A chimney
or equivalent is required for this heater.
• Existing masonry or metal chimney: before installing the heater, clean and inspect the chimney. Make any
necessary repairs and ensure that the chimney meets all requirements.
• Approved factory-built chimney: ensure that it meets all requirements and install it according to the manufacturer’s
instructions.

16 I-OH (01-20) PN120390R7
INSTALLATION—CONTINUED
Venting and Combustion Air—Continued
Chimney—Continued
• Field-constructed metal chimney: ensure that the vent pipe is as follows:
Minimum 7-inch (178-mm) diameter for unit size 095
Minimum 8-inch (203-mm) diameter for unit sizes 140 and 190
24-gauge or heavier triple-wall stainless steel (recommended) or 24-gauge or heavier galvanized steel
If the venting arrangement passes through a ceiling, triple-wall stainless vent pipe is required above the ceiling.
The point of passage through a ceiling must be guarded by a metal ventilated thimble not less than 12 inches
(305 mm) larger in diameter than the pipe.
Install a tee with a cleanout cap at the bottom of the vertical rise
• Dimensions: ensure that the dimensions of the chimney are as follows:
Minimum 7-inch (178-mm) diameter for unit size 095
Minimum 8-inch (203-mm) diameter for unit sizes 140 and 190
Minimum of 3 feet (0.9 meters) above the highest point of exit where it passes through the roof
Minimum of 2 feet (0.6 meters) higher than any portion of a building within 10 feet (3 meters) of the chimney
Minimum of 8 feet (2.4 meters) total chimney height
• Draft: the chimney must be capable of maintaining a steady draft of 0.04 IN WC. If the draft is below the
minimum required, a draft inducer must be installed.
• Vent connection from the flue outlet of the heater to the chimney: ensure that the vent pipe is as follows:
Minimum 7-inch (178-mm) diameter for unit size 095
Minimum 8-inch (203-mm) diameter for unit sizes 140 and 190
24-gauge or heavier triple-wall stainless steel (recommended) or 24-gauge or heavier galvanized steel
Keep the length of the vent pipe connection as short and direct as possible
As it leaves the heater, slope the horizontal run upward at least 1 inch for each 3 feet of pipe. The horizontal run
should not be longer than one-half of the vertical or chimney height and never over 10 feet (3 meters) unless a
draft inducer is being installed.
• Vent pipe connector passes through a combustible wall: vent pipe must be guarded at the point of passage
by either a metal ventilated thimble not less than 12 inches (305 mm) larger in diameter than the pipe or a metal
or burned fireclay thimble built in brickwork or other approved fireproofing material extending not less than 8
inches (203 mm) beyond all sides of the thimble. If a thimble is not installed, all combustible material in the wall or
partition must be cut away 9 inches (229 mm) from the pipe. If any material is used to close this opening, it must
be non-combustible.
• Fasteners and supports: fasten all vent piping using sheet metal screws and support horizontal vent pipe from
above using noncombustible straps.
• Pipe runs: avoid sharp turns in the vent pipe or other construction features that would create resistance to the
flow of the flue gases.
• Dampers: do not use a manually operated damper or any other device that will obstruct the free flow of the flue
gases.
• Vent pipe connection inside chimney: the end of the vent pipe connection must not extend past the inside wall
of the chimney. A thimble may be used in the chimney connection to facilitate removal for cleaning. The thimble
should be permanently cemented in place with high-temperature cement.

I-OH (01-20) PN120390R7 17
Barometric Draft Regulator (Option DB1)
NOTE:
• Option DB1 (barometric draft regulator, see Figure 10) is required in Canada. Option DB1 or
equivalent is required in the US.
• Do not install a barometric draft regulator if the installation includes an optional outside combustion
air inlet (option DE1).
Figure 10. Barometric Draft Regulator (Option DB1)
• Canadian installations: option DB1 is required and must be installed near the heater flue outlet. The preferred
mounting location for the draft regulator is in the vertical flue pipe (see Figure 10). Depending on the venting
arrangement, the alternate location for installing the draft regulator is in the horizontal run. Follow the manufacturer’s
instructions included with the draft regulator.
• US installations: a UL-listed type barometric draft regulator such as option DB1, must be installed in the flue
near the heater flue outlet. The preferred mounting location for the draft regulator is in the vertical flue pipe (see
Figure 10). Depending on the venting arrangement, the alternate location for installing the draft regulator is in the
horizontal run. Install the draft regulator according to the manufacturer’s instructions.
Draft Inducer Relay (Option DH1)
•A relay (Option DH1) is available for connecting a field-supplied UL-listed (US installations) or CSA/ULC-listed
(Canadian installations).
•A draft inducer is required when the draft in the flue measures less than 0.04 IN WC on a draft gauge. Refer to
Startup Checklist section for instructions for measuring draft.
•When a draft inducer is installed, the safety provision must be made to shut off the fuel supply to the burner in the
event of the failure of the draft inducer. See the optional exhaust flow safety switch on the wiring diagram.
Outside Combustion Air Intake Adapter Kit (Option DE1, Shipped Separately)
•A UL-listed outside combustion air intake adapter kit (option DE1) is available to provide outside air for combustion.
•Option DE1 is not available for Canadian installations.
•See Figure 11 for installation and follow the manufacturer’s instructions furnished with the kit.

18 I-OH (01-20) PN120390R7
INSTALLATION—CONTINUED
Venting and Combustion Air—Continued
Outside Combustion Air Intake Adapter Kit (Option DE1, Shipped Separately)—Continued
Figure 11. Outside Combustion Air Intake Adapter Kit (Option DE1)
Electrical Connections
Electrical Connection Requirements
•All wiring must be done in accordance with the National Electric Code or CSA Standard C22.1, Canadian Electrical
Code, Part 1, and local ordinances.
•In many localities, #14 wire run in rigid conduit must be used, but where permissible, two- and three-wire BX is
recommended, particularly for connections to the controls and burner motor.
•A cutoff switch for the main 115V line to the burner should be mounted on a fireproof wall in an accessible place
close to the burner.
Electrical Connections for Optional Equipment
•The heater is equipped with low voltage controls (24V) for thermostat control.
•Refer to separate instructions for any optional equipment provided.
Supply and Line Wiring
•Check the rating plate on the heater for supply voltage and current requirements.
•A separate line voltage supply with a fused disconnect switch should be run directly from the main panel to the
heater, making connection to leads in the junction box. All external wiring must be within approved conduit.
Conduit from the disconnect switch must be run so as to not interfere with heater service access. Refer to the
wiring diagram in the heater junction box.
•All replacement wiring must be type SF, SEWF, TW, TEW, or equivalent. Use #18 gauge wire for control circuits
and #14 gauge or larger for line connections depending on current requirements.
•Refer to Table 9 for unit electrical ratings (115V, 60 Hz).
Table 9. Electrical Ratings
Unit Size Total Current Amperes Minimum Circuit Ampacity Minimum Fuse Size
095 6 8 15
140, 190 7 9 15

I-OH (01-20) PN120390R7 19
Wiring Diagrams
•See Figure 12 for a typical wiring diagram for UL-listed models.
•See Figure 13 for a typical wiring diagram for CSA-listed models.
Figure 12. Typical Wiring Diagram for UL-Listed Model
115/1/60

20 I-OH (01-20) PN120390R7
Figure 13. Typical Wiring Diagram for CSA-Listed Model
Electrodes and Nozzle
•The position of the electrodes in the nozzle is shown in Figure 14.
•The electrodes are adjusted at the time of manufacture.
•It is important that electrode adjustment is checked prior to firing the unit. However, they should be checked at
time of installation to ensure that they are still set as shown in Figure 14.
•Adjust the electrodes as necessary in accrdance with the Service Oil Nozzle and Spark Electrodes section.
INSTALLATION—CONTINUED
Electrical Connections—Continued
Wiring Diagrams—Continued