Table of Contents
Advertisement
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.
LF25-030/105 Compact Unit Dimensions.......................2
Compact Unit Parts Arrangement ...................................3
LF25-125/200 Standard Unit Dimensions ......................4
LF25-250/400 Standard Unit Dimensions ......................5
Standard Unit Parts Arrangement...................................6
Shipping..........................................................................7
Optional Accessory .........................................................7
Requirements in USA .....................................................7
Requirements in Canada ................................................7
Additional Requirements ................................................8
Unit Heater Installation ...................................................8
Combustion and Ventilation Air.......................................8
Rotation of Combustion Air Inducer - 125/150................9
Venting............................................................................9
Electrical Connections ..................................................14
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.
Gas Connection ...........................................................18
Leak Check ..................................................................18
Unit Start-Up ................................................................18
To Turn Off Gas to Unit ................................................19
Heating Sequence of Operations ................................19
Ignition Control LED ....................................................20
High Altitude Adjustments ............................................20
Gas Flow .....................................................................20
Gas Pressure Adjustments ..........................................20
Limit Control Switch ......................................................21
Louver Vane Adjustment ..............................................21
Combustion Air Pressure Switch .................................21
Flame Rollout Switch ...................................................21
Service..........................................................................21
Start-Up and Performance Checklist ...........................22
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.
Page 1
INSTALLATION
INSTRUCTIONS
LF25
30,000 to 400,000 Btuh Series
UNIT HEATERS
507930-01
3/2019
Advertisement
Table of Contents
Related Manuals for Lennox LF25 Series
Summary of Contents for Lennox LF25 Series
-
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: Table Of Contents 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 [13] (70) (108) (25) FLOW (533) HEAT EXCHANGER (25) ELECTRICAL TOP VIEW INLET HANGING (737) (533) -
Page 3: Compact Unit Parts Arrangement
LF25 COMPACT UNIT HEATER PARTS ARRANGEMENT 030 / 105K BTUH Page 3... -
Page 4: 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 INLETS 10-5/8 31-7/8 (810) (270) COMBUSTION AIR ADJUSTABLE INDUCER LOUVERS... -
Page 5: 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 INLETS TOP VIEW 10-5/8 31-7/8 (810) (270) COMBUSTION AIR ADJUSTABLE INDUCER LOUVERS... -
Page 6: Standard Unit Parts Arrangement
LF25 STANDARD UNIT HEATER PARTS ARRANGEMENT 125 / 400K BTUH Page 6... -
Page 7: Shipping
Shipping Requirements in Canada Shipping contents includes heater, installation in- These instructions are intended only as a general guide structions, warranty certificate, two mounting brackets and do not supersede local codes in any way. Authorities (shipped loose in LF25-30/105 units), and a flue transi- having jurisdiction should be consulted before installation. -
Page 8: Additional Requirements
LF25-30/105 TABLE 1 Unit may be installed as shown in figure 1 or rotated UNIT CLEARANCES TO COMBUSTIBLE MATERIALS 180°. Side** Bottom Back Flue Unit 1 - Push each louver to the right to depress spring and release locking tab on the other end (locking tab 030/105 keeps the louver in place for shipping). -
Page 9: Rotation Of Combustion Air Inducer - 125/150
or another appliance will operate in an inefficient manner, FLUE BOX AND COMBUSTION AIR resulting in incomplete combustion which can result in the INDUCER ASSEMBLY production of excessive carbon monoxide. WARNING 125/150 VEST PANEL Insufficient combustion air can cause headaches, nausea, dizziness or asphyxiation. - Page 10 A single-wall vent pipe used as a vent connector in resi- NOTE - If needed, loosen the upper right two or three dential or commercial applications, or as a vertical vent in screws securing the combustion air blower. Slide the tran- commercial applications, must have all seams and joints sition into place and secure loosened screws.
- Page 11 6 - The unit may be vented vertically as a single appliance level and maximum snow height. or in a common vent with other gas-fired appliances. 7 - Do not install a horizontal vent termination directly In common venting situations, vent connectors for below roof eaves or above a public walkway, or other appliances must maintain a 4”...
- Page 12 CONDENSATE DRAIN THROUGH TEE PIPE AND DRAIN LOOP NOTE − Minimum − DOWNWARD SLOPE ON HORIZONTAL VENT − RESIDENTIAL OR COMMERCIAL APPLICATION horizontal vent length is 5 ft. This does not include termination tee. Refer to table 3 for Category III maximum length and adaptor must DRAIN TEE...
- Page 13 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 3 for LISTED THIMBLE MALE maximum length and THROUGH ADAPTER ELBOW...
-
Page 14: Electrical Connections
The LF25 series unit heaters use a direct spark ignition appliance. When inspection reveals that an existing chimney is not safe for the intended purpose, it system. - Page 15 537992-01 I GN CTRL HIGH VOLTAGE POWER CONNECTIONS W HT GRN- YEL FIELD PROVIDED FACTORY INSTALLED POWER POWER WIRING. WIRING MAKE FIELD POWER P368 CONNECTIONS IN POWER ENTRY BOX. J 368 XFM R- L1 XFM R- N W HT GRN- YEL GND- BOARD GND W I RE P373...
- Page 16 538025-01 I GN CTRL HI GH VOLTAGE POW ER CONNECTI ONS W HT GRN- YEL W HT FIELD PROVIDED POWER WIRING. CONNECT TO P366 AND GREEN GROUND SCREW LOCATED INSIDE UNIT. P368 J 368 XFM R- L1 XFM R- N W HT GRN-YEL GND- BOARD...
- Page 17 538024-01 I GN CTRL HIGH VOLTAGE POWER CONNECTIONS W HT GRN- YEL W HT FIELD PROVIDED POWER WIRING. CONNECT TO P366 AND GREEN GROUND SCREW LOCATED INSIDE UNIT. P368 J 368 XFM R- L1 XFM R- N W HT GRN- YEL GND- BOARD GND W I RE P373...
-
Page 18: Gas Connection
NOTE - In case emergency shutdown is required, shut Gas Connection down main gas valve and disconnect main power to unit. When connecting gas supply, the length of the run from These devices should be properly labeled by the installer. the meter must be considered in determining the pipe size to avoid excessive pressure drop. -
Page 19: To Turn Off Gas To Unit
OPERATION OF WHITE RODGERS 36H SERIES VALVE WHITE RODGERS 36 GAS VALVE (FIGURE 9) AND WHITE RODGERS 36G SERIES GAS Single-Stage MANIFOLD VALVE (FIGURE 10) INLET PRESSURE PRESSURE NOTE - STOP! Read the safety information at the begin- ADJUSTMENT PORT ning of this section. -
Page 20: Ignition Control Led
No adjustment is necessary. 4500 feet (1372m) above sea level is the jurisdiction of Gas Flow local authorities. Lennox recommends derating 4%/1000 feet above 4,500 feet. Refer to table 6 for natural gas To check for proper gas flow to the combustion chamber, manifold pressures and the Engineering Handbook for determine the Btu input from the appliance rating plate. -
Page 21: Limit Control Switch
FLUE PASSAGEWAY AND FLUE BOX Limit Control Switch The flue passages and flue box should be inspected and The limit control switch(es) is factory-set and is not cleaned prior to each heating season. The sequence of field-adjustable. operation should be as follows: Louver Vane Adjustment 1 - Turn off both electrical and gas supply to unit. -
Page 22: Start-Up And Performance Checklist
LED. 6 - To restart the system, de-energize the thermostat call NOX for a list of the Lennox dealers in the area. Include manufacturer’s or distributor’s name and address. It is a requirement in the Z83.8 standard.
Need help?
Do you have a question about the LF25 Series and is the answer not in the manual?
Questions and answers