GUIDE SPECIFICATIONS
T−Class Packaged Gas / Electric 7.5 to 12.5 tons / Page 10
PART 2 PRODUCTS
Specifier Note: Retain article below for proprietary method specification. Add product attributes, performance
characteristics, material standards and descriptions as applicable. Use of such phrases as or equal" or or approved
equal" or similar phrases may cause ambiguity in specifications. Such phrases require verification (procedural, legal and
regulatory) and assignment of responsibility for determining or equal" products.
2.01 [Lennox LF24] GAS−FIRED UNIT HEATERS
A. Manufacturer:[ Lennox Industries]
1. Contact: [2100 Lake Park Blvd., Richardson, TX 75080; Telephone: (800) 453−6669; Web site:
www.lennox.com
]
B. General:
1. Air−Flow: Horizontal
2. Venting
a. Horizontal
b. Vertical
3. All units to be shipped completely assembled at the factory
4. Hanging brackets to be supplied by manufacturer for field mounting of unit heater
5. Controls to be factory installed and wired
6. All units must pass a factory run−test before shipping
7. Installer to:
a. Make unit gas supply connections
b. Make electrical connections
c. Mount thermostat
d. Make flue connections
Specifier Note: LF24 models with BTUH requirements: 030 (30,000 Btuh), 045 (45,000 Btuh), 060 (60,000 Btuh), 075 (75,000
Btuh), 100 (100,000 Btuh), 115 (115,000 Btuh), 145 (145,000 Btuh), 175 (175,000 Btuh), 200 (200,000 Btuh), 230 (230,000 Btuh),
250 (250,000 Btuh), 300 (300,000 Btuh), 345 (345,000 Btuh), and 400 (400,000 Btuh).
8. See schedule for Btuh of unit required
C. [Proprietary] Products/Systems: [LF24] Gas−fired unit heaters includes the following:
1. Cabinet:
a. Pre−painted
b. Heavy gauge galvanized steel construction
c. Internally insulated cabinet
d. Adjustable louvers
e. Contains all electrical and safety controls
Specifier Note: Wiring Junction box located inside the cabinet on LF24 models 030, 045, 060 and 075. Wiring Junction box
mounted on the exterior of the cabinet on LF24 models 100, 115, 145, 175, 200, 230, 250, 300, 345, and 400.
f. Wiring Junction box mounted inside cabinet or on the exterior of the cabinet
2. Heating System:
a. Combination gas control valve
1. 24 volt
2. Manual shutoff valve
3. Dual Valve:
a. Pressure regulator
b. Automatic electric valve
b. Solid−state igniter
1. Direct−spark
2. Intermittent spark
c. Electronic flame sensor
d. Combustion air inducer
1. Pre−purge heat exchanger
2. Pressure switch to prove operation
3. Operates only during heating
4. Blower motor is thermally protected
e. Heat Exchanger:
1. Tubular
Specifier Note: Aluminized Steel heat exchanger is available on all LF24 models. Stainless Steel heat exchanger is only
available on the LF24 models 100, 115, 145, 175, 200, 230, 250, 300, 345, and 400.
2. [Aluminized Steel] [and][/][or] [Stainless steel]
3. Curving design
4. Laboratory lifecycle tested
f. Inshot burners:
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