1 − Seal any unused openings in the common venting sys- tem.
2 − Inspect the venting system for proper size and horizontal pitch. Determine that there is no blockage, restriction, leakage, corrosion, or other deficiencies which could cause an unsafe condition.
3 − Close all building doors and windows and all doors be- tween the space in which the appliances remaining connected to the common venting system are located and other spaces of the building. Turn on clothes dry- ers and any appliances not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will oper- ate at maximum speed. Do not operate a summer ex- haust fan. Close fireplace dampers.
4 − Follow the lighting instructions. Turn on the appliance that is being inspected. Adjust the thermostat so that the appliance operates continuously.
5 − After the main burner has operated for 5 minutes, test for leaks of flue gases at the draft hood relief opening. Use the flame of a match or candle.
6 − After determining that each appliance connected to the common venting system is venting properly, (step 3) return all doors, widows, exhaust fans, fireplace damp- ers, and any other gas−burning appliances to their pre- vious mode of operation.
7 − If a venting problem is found during any of the preced- ing tests, the common venting system must be modi- fied to correct the problem.
Resize the common venting system to the minimum vent pipe size determined by using the appropriate tables in Appendix G. (These are in the current stan- dards of the National Fuel Gas Code ANSI Z223.1.
Electrical
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic com- ponents. Take precautions during furnace installa- tion and service to protect the furnace’s electronic controls. Precautions will help to avoid control ex- posure to electrostatic discharge by putting the fur- nace, the control and the technician at the same electrostatic potential. Neutralize electrostatic charge by touching hand and all tools on an un- painted unit surface, such as the gas valve or blower deck, before performing any service procedure.
INTERIOR MAKE−UP BOX
(FACTORY− INSTALLED LEFT SIDE)
| MAKE−UP | |
Left side | BOX INSIDE | |
CABINET | ||
|
FIGURE 38
EXTERIOR MAKE−UP BOX
(FIELD PROVIDED RIGHT SIDE)
MAKE−UP
BOX
OUTSIDE
CABINET
Right Side
FIGURE 39
The unit is equipped with a make−up box on the left hand side of the cabinet. A field−provided make−up box can be installed on the exterior of the right side of the furnace to facilitate installation. If the make−up box is moved to the right side, clip the wire ties that bundle the wires together and install on the outside of the cabinet. See figure 39. The excess wire must be pulled into the blower compartment. Secure the excess wire to the existing harness to protect it from damage.
Refer to figure 40 for unit field wiring. See figures 41 and 42 for icomfort Toucht thermostat wiring in communicating applications. Table 14 shows DIP switch and on−board link settings for non−communicating thermostat applications. Typical wiring schematic is shown in figure 43.
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