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WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal injury
or loss of life. Installation and service must be performed
by a licensed professional installer (or equivalent), service
agency or the gas supplier.
CAUTION
As with any mechanical equipment, personal injury can
result from contact with sharp sheet metal edges. Be
careful when you handle this equipment.
Table Of Contents
Shipping and Packing List ..............................................2
LF25-030/105 Compact Unit Dimensions.......................3
Compact Unit Parts Arrangement ...................................4
LF25-125/200 Standard Unit Dimensions ......................5
LF25-250/400 Standard Unit Dimensions ......................6
Standard Unit Parts Arrangement...................................7
Optional Accessory .........................................................8
Requirements in USA .....................................................8
Requirements in Canada ................................................8
Additional Requirements ................................................9
Unit Heater Installation ...................................................9
Rotation of Combustion Air Inducer - 125/150.............. 11
Combustion and Ventilation Air.....................................12
Venting..........................................................................12
Electrical Connections ..................................................17
Gas Connection ...........................................................22
Be sure to read and understand the
structions in this manual.
ation, service or maintenance can cause
serious injury, death or property damage.
Do not store or use gasoline or other
cinity of this or any other appliance.
formed by a qualified installer, service
agency or the gas supplier.
RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
WARNING
FIRE OR EXPLOSION HAZARD.
Failure to
ly could result in serious injury, death,
or property damage.
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
structions.
If you cannot reach your gas supplier, call the
fire department.
INSTALLATION
INSTRUCTIONS
LF25
30,000 to 400,000 Btuh Series
UNIT HEATERS
507930-04
5/2021
Supersedes 507930-03
Note - Unit heaters are designed for indoor use only.
Leak Check ..................................................................23
Unit Start-Up ................................................................23
To Turn Off Gas to Unit ................................................24
Heating Sequence of Operations ................................24
Ignition Control LED ....................................................25
High Altitude Adjustments ............................................25
Gas Flow .....................................................................25
Supply Gas Pressure Adjustments ..............................25
Supply Pressure Measurement ....................................25
Manifold Pressure Measurement..................................26
Limit Control Switch ......................................................26
Louver Vane Adjustment ..............................................26
Combustion Air Pressure Switch .................................26
Flame Roll-out Switch ..................................................26
Service..........................................................................26
Start-Up and Performance Checklist ...........................27
Page 1
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Table of Contents
Related Manuals for Adp LF25 Series
Summary of Contents for Adp LF25 Series
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Page 1: Table Of Contents
INSTALLATION WARNING INSTRUCTIONS Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury LF25 or loss of life. Installation and service must be performed by a licensed professional installer (or equivalent), service agency or the gas supplier. 30,000 to 400,000 Btuh Series UNIT HEATERS CAUTION... -
Page 2: Shipping And Packing List
Shipping and Packing List Shipping and Packing List 30-105 Units 125-400 Units Package 1 of 1 contains: Package 1 of 1 contains: 1-Unit Heater 1-Unit Heater 2-Hanging brackets 1-Burner box hood (4” Flue transition is factory-installed) 1-Rectangular to round flue transition Bag assembly containing: - 4”... -
Page 3: Lf25-030/105 Compact Unit Dimensions
LF25-030 / 105 DIMENSIONS - Inches (mm) MOUNTING SLOTS (Typical) HANGING 5/16 x 3 Inches (8 x 76 mm) BRACKETS (2) 8-3/4 10-1/2 (222) (267) 2-3/4 4-1/4 (70) [13] (108) (25) FLOW (533) HEAT EXCHANGER (25) ELECTRICAL TOP VIEW INLET THERMOSTAT INLET HANGING... -
Page 4: Compact Unit Parts Arrangement
Page 4... -
Page 5: Lf25-125/200 Standard Unit Dimensions
LF25-125 / 200 DIMENSIONS - Inches (mm) 10-1/2 5-3/8 16 (406) (267) (137) 1/2 (13) FLUE OUTLET 3-1/8 (79) 1/2 (13) (4) 3/8-16 MOUNTING NUTS 2-1/2 (64) FOR UNIT SUSPENSION TOP VIEW ELECTRICAL / THERMOSTAT INLETS 10-5/8 31-7/8 (810) (270) COMBUSTION AIR ADJUSTABLE INDUCER... -
Page 6: Lf25-250/400 Standard Unit Dimensions
LF25-250 / 400 DIMENSIONS - Inches (mm) 10-1/2 16 (406) (267) (76) 5-3/8 (137) 1/2 (13) FLUE OUTLET 3-1/8 (79) 1/2 (13) (4) 3/8-16 MOUNTING NUTS FOR UNIT SUSPENSION 2-5/8 (67) ELECTRICAL / THERMOSTAT TOP VIEW INLETS 10-5/8 31-7/8 (810) (270) COMBUSTION AIR ADJUSTABLE... -
Page 7: Standard Unit Parts Arrangement
Page 7... -
Page 8: Optional Accessory
Optional Accessory Requirements in Canada These instructions are intended only as a general guide Units require a changeover kit when the unit is to be used and do not supersede local codes in any way. Authorities with LP/propane gas. The kit is ordered separately. See having jurisdiction should be consulted before installation. -
Page 9: Additional Requirements
LF25-125/400 UNITS TABLE 1 Four mounting nuts are furnished. Refer to dimension UNIT CLEARANCES TO COMBUSTIBLE MATERIALS illustration. Mounting nuts will accommodate 3/8” x 16 Side** Bottom Back Flue threaded rods. Unit CAUTION 030/105 125/400 Do not install unit heaters in close proximity to fire *6”... - Page 10 FIGURE 2 FIGURE 3 Page 10...
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Page 11: Rotation Of Combustion Air Inducer - 125/150
LF25-30/105 Rotation of Combustion Air Inducer (LF25-125 & 150 Only) Unit may be installed as shown in figure 4 or rotated 180°. The combustion air inducer on LF25-125 & 150 may be rotated 90° either to the left or right of the original vertical 1 - Push each louver to the right to depress spring and position in order to better suit the application. -
Page 12: Combustion And Ventilation Air
Venting Combustion and Ventilation Air NOTE - The gas vent is a passageway, vertical or nearly Adequate facilities for supplying air for combustion and so, used to convey flue gases from an appliance, or its ventilation must be provided in accordance with the cur- vent connector, to the outside atmosphere. - Page 13 A single-wall, metal vent pipe used as a vent connector in 3 - Keep the vent connector runs as short as possible residential or commercial applications, or as a vertical gas with a minimum number of elbows. Refer to the vent in commercial applications, must have all seams and current edition of ANSI Z223.1 or CSA-B149 joints sealed with pressure-sensitive aluminum tape or...
- Page 14 6 - The unit may be vented vertically as a single appliance TABLE 4 or in a common vent with other gas-fired appliances. MAXIMUM HORIZONTAL VENT CONNECTOR AND In common venting situations, vent connectors for HORIZONTAL VENT PIPE LENGTHS other appliances must maintain a 4” (102mm) vertical separation between the vent connectors.
- Page 15 13 - All horizontal vents which use special vent pipe for 16 - For upward sloped vent, a condensate tee and use with Category III appliances must terminate drain must be installed within the first 5 feet (1.5m) with a listed termination tee. Termination must from the unit heater to protect the appliance (see be installed in accordance with manufacturer’s figure 7).
- Page 16 CONDENSATE DRAIN THROUGH VENT TERMINATION DOWNWARD SLOPE ON HORIZONTAL VENT−RESIDENTIAL OR COMMERCIAL APPLICATION NOTE − Minimum horizontal vent length is 5 ft. This does not include termination tee. DOUBLE Refer to table 4 for LISTED THIMBLE MALE maximum length and THROUGH ADAPTER ELBOW...
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Page 17: Electrical Connections
THERMOSTAT WIRING chimney is not safe for the intended purpose, it The LF25 series unit heaters use a direct spark ignition shall be rebuilt to conform to nationally recognized system. There is no pilot necessary as the spark lights the standards, lined or relined with suitable materials main burner when the gas valve is turned on. - Page 18 LINE VOLTAGE WIRING HIGH VOLTAGE WIRING 1 - Install a separate fused disconnect switch with the fuse sized according to the blower motor size. 125 / 400 NOTE - Electrically ground unit in accordance with local GRN-YEL codes or, in the absence of local codes, in accordance with the current editions of the ANSI/NFPA No.
- Page 19 5 3 7 9 9 2 -0 2 I GN CT RL HI GH VOL T AGE POW E R CONNE CT I ONS BL K W HT GRN- YE L W HT F I E L D PROVI DE D F ACT ORY I NS T AL L E D POW E R POW E R W I RI NG.
- Page 20 5 3 8 0 2 5 -0 2 I GN CT RL HI GH VOL T AGE POW E R CONNE CT I ONS BL K W HT GRN- YE L W HT F I E L D PROVI DE D POW E R W I RI NG. CONNE CT T O P366 AND GRE E N GROUND S CRE W L OCAT E D I NS I DE UNI T .
- Page 21 5 3 8 0 2 4 -0 2 I GN CT RL HI GH VOL T AGE POW E R CONNE CT I ONS BL K W HT GRN- YE L BL U BL U W HT F I E L D PROVI DE D POW E R W I RI NG. CONNE CT T O P366 AND GRE E N GROUND S CRE W L OCAT E D I NS I DE UNI T .
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Page 22: Gas Connection
Gas Connection GAS SUPPLY CONNECTION Note - Install protective bushing (provided in bag as- sembly) before making gas connections. MANUAL MAIN SHUT-OFF VALVE When connecting gas supply, the length of the run from (Furnished by Installer) the meter must be considered in determining the pipe size to avoid excessive pressure drop. -
Page 23: Leak Check
Return Air Temperature Requirements: Leak Check The following return air temperatures must be maintained for op- After gas piping is completed, carefully check all piping timum unit operation and extended life of the heat exchanger. connections, (field and factory), for gas leaks. Use a soap Failure to comply with the conditions will void the warranty. -
Page 24: To Turn Off Gas To Unit
To Turn Off Gas to Unit Heating Sequence of Operation 1 - When the thermostat calls for heat, the combustion 1 - Set thermostat to lowest level. air inducer starts immediately. 2 - Turn off all electrical power to unit if service is to be 2 - Combustion air pressure switch proves inducer performed. -
Page 25: Ignition Control Led
In the US, units may be fired at full input up to 2000 feet Ignition Control LED (610m) above sea level. Above 2000 feet (610m), unit The ignition control contains a green LED which indicates must be de-rated by four percent per 1000 feet for in- the following: stallation above 2000 feet. -
Page 26: Manifold Pressure Measurement
For White Rodgers 36H valve (Figure 13), supply pressure is Limit Control Switch accessed by removing 1/8” hex screw. Remove the 1/8” hex The limit control switch(es) is factory-set and is not screw and install a 1/8” fitting with hose barb. Connect tubing field-adjustable. -
Page 27: Start-Up And Performance Checklist
FLUE PASSAGEWAY AND FLUE BOX FAILURE TO OPERATE The flue passages and flue box should be inspected and If unit fails to operate check the following: cleaned prior to each heating season. The sequence of 1 - Is thermostat calling for heat? operation should be as follows: 2 - Is main disconnect closed? 1 - Turn off both electrical and gas supply to unit.