Installed in Combination with a Cooling Coil
When this furnace is used with cooling units, it shall be installed in parallel with, or on the upstream side of, cooling units to avoid condensation in the heating compartment. With a parallel flow arrangement, a damper (or other means to control the flow of air) must adequately prevent chilled air from entering the furnace (figure 3). If the damper is manual- ly operated, it must be equipped to prevent operation of ei- ther the heating or the cooling unit, unless it is in the full HEAT or COOL setting.
SLP98DFV INSTALLED PARALLEL
WITH COOLING COIL
CAUTION
Do not set thermostat below 60°F (16°C) in heating mode. Setting thermostat below 60°F (16°C) reduces the number of heating cycles. Damage to the unit may occur that is not covered by the warranty.
The SLP98DFV furnace may be installed in alcoves, clos- ets, attics, basements, garages, and utility rooms.
This furnace is not designed for installation in mobile homes, recreational vehicles, or outdoors.
Never use an open flame to test for gas leaks. Check all connections using a commercially available soap solution made specifically for leak detection.
Use of Furnace as Construction Heater
GAS UNIT
Dampers
(open during heating
operation only)
AIR HANDLER
Dampers
(open during cooling
operation only)
Lennox does not recommend the use of SLP98DFV units as a construction heater during any phase of construction. Very low return air temperatures, harmful vapors and op- eration of the unit with clogged or misplaced filters will dam- age the unit.
SLP98DFV units may be used for heating of buildings or structures under construction, if the following conditions are met:
D The vent system must be permanently installed per these installation instructions.
FIGURE 3
When installed, this furnace must be electrically grounded according to local codes. In addition, in the United States, installation must conform with the current National Electric Code, ANSI/NFPA No. 70. The National Electric Code (ANSI/NFPA No. 70) is available from the following ad- dress:
National Fire Protection Association
1 Battery March Park
Quincy, MA 02269
NOTE − This furnace is designed for a minimum continu- ous return air temperature of 60°F (16°C) or an intermit- tent operation down to 55°F (13°C) dry bulb for cases where a night setback thermostat is used. Return air tem- perature must not exceed 85°F (29°C) dry bulb.
In Canada, all electrical wiring and grounding for the unit must be installed according to the current regulations of the Canadian Electrical Code Part I (CSA Standard C22.1) and/or local codes.
DA room thermostat must control the furnace. The use of fixed jumpers that will provide continuous heating is not allowed.
DThe return air duct must be provided and sealed to the furnace.
DReturn air temperature range between 60°F (16°C) and 80°F (27°C) must be maintained.
DAir filters must be installed in the system and must be maintained during construction.
DAir filters must be replaced upon construction comple- tion.
DThe input rate and temperature rise must be set per the furnace rating plate.
DOne hundred percent (100%) outdoor air must be pro- vided for combustion air requirements during construc- tion. Temporary ducting may supply outdoor air to the furnace. Do not connect duct directly to the furnace.
DThe furnace heat exchanger, components, duct system, air filters and evaporator coils must be thoroughly cleaned following final construction clean−up.
DAll furnace operating conditions (including ignition, in- put rate, temperature rise and venting) must be verified according to these installation instructions.
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