Leak Check
After gas piping is completed, carefully check all piping connections (factory− and field−installed) for gas leaks. Use a leak detecting solution or other preferred means.
NOTE − If emergency shutoff is necessary, shut off the main manual gas valve and disconnect the main power to the furnace. The installer should properly label these devices.
CAUTION
Some soaps used for leak detection are corrosive to certain metals. Carefully rinse piping thoroughly af- ter leak test has been completed. Do not use matches, candles, flame or other sources of ignition to check for gas leaks.
The furnace must be isolated from the gas supply system by closing its individual manual
IMPORTANT
When testing pressure of gas lines, gas valve must be disconnected and isolated. See figure 18. Gas valves can be damaged if subjected to pressures greater than 1/2 psig (3.48 kPa, 14 inches w.c.).
INTERIOR MAKE−UP BOX INSTALLATION
(Right Side)
MAKE−UP
BOX
Cut the two wire ties to extend power wires for right side only
FIGURE 19
Refer to figure 20 for schematic wiring diagram and trou- bleshooting and table 9 for field wiring.
The power supply wiring must meet Class I restrictions. Protected by either a fuse or circuit breaker, select circuit protection and wire size according to unit nameplate.
NOTE − Unit nameplate states maximum current draw. Maximum over−current protection allowed is 15 AMP.
MANUAL MAIN
SHUT−OFF VALVE WILL NOT HOLD NORMAL TEST PRESSURE
1/8 NPT PLUG
CAP
ISOLATE
GAS VALVE
FURNACE
Holes are on both sides of the furnace cabinet to facilitate wiring.
Install a separate (properly sized) disconnect switch near the furnace so that power can be turned off for servicing.
Before connecting the thermostat, check to make sure the wires will be long enough for servicing at a later date. Make
FIGURE 18
Electrical
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic discharge can affect elec- tronic components. Take precautions to neutralize electrostatic charge by touching your hand and tools to metal prior to handling the control.
The unit is equipped with a field make−up box on the left hand side of the cabinet. The make−up box may be moved to the right side of the furnace to facilitate installation. If the make−up box is moved to the right hand side, clip the wire ties that bundle the wires together. Secure the excess wire to the existing harness to protect it from damage.
sure that thermostat wire is long enough to facilitate future removal of blower for service.
Complete the wiring connections to the equipment. Use 18−gauge wire or larger that is suitable for Class II rating for thermostat connections.
Electrically ground the unit according to local codes or, in the absence of local codes, according to the current Na- tional Electric Code (ANSI/NFPA No. 70). A green ground wire is provided in the field make−up box.
NOTE − The EL280DF furnace contains electronic compo- nents that are polarity sensitive. Make sure that the furnace is wired correctly and is properly grounded.
Accessory Terminals
One line voltage ade terminal is provided on
the furnace integrated control. See figure 21 for integrated control configuration. This terminal is energized when the indoor blower is operating. Any accessory rated up to one amp can be connected to this terminal with the neutral leg
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