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FIGURE 24 : Anti-Backflow Damper FURNACE AND AIR CONDITIONER INSTALLATIONS If an air conditioner is installed which does not use the blower for air distribution and operates completely independent of the furnace, the thermostat system must have an interlock to prevent the furnace and air conditioner from operating at the same time. This interlock system usually contains a heat-cool switch which must be turned to either HEAT or COOL to acti vate either heating or cooling operation, or a positive OFF switch on the cooling thermostat. When used in connection with a cooling unit the furnace shall be installed parallel with or on the upstream side of the cooling unit to avoid condensation in the heat exchanger. For installations with a parallel flow arrangement, the furnace must be equipped with a damper to prevent cold air from being discharged up around the heat exchanger. Cold air causes condensation inside the exchanger and can cause it to rust out which can allow products of combustion to be circulated into the living area by the furnace blower resulting in possible asphyxiation. An air flow activated automatic damper, PIN 7900-6771, is available from furnace manufacturer. See Figure 24. NOTE: See label on coil panel for conversion and lighting instructions. Obtain a temperature rise within the ranges specified on the name plate. Unitary Products Group 035-16328-002 Rev. C (0902) HIGH ALTITUDE DERATION CHART NATURAL GAS Elevation 56,000--lnput Odfice Drill Pa_ #Dia. Size 70,000--Input Odfce Dnll Pa_ #Dia. Size 77,000--Input Odfice Ddll Pa_ #Dia Size 90,000--Input Odfice Ddll Pa_ #Dia. Size Sea Level 0.136 29 9951-1361 0,154 23 9951--1541 0.161 20 9951--1611 0.180 15 9951-1801 2,000 0.136 29 9981--1361 0.149 25 9951--1491 0.157 22 9951-1571 0.177 16 9951--1771 3,000 0.128 30 9981--1281 0,149 25 9951--1491 0.157 22 9951-1571 0.173 17 9951--1731 4,000 0.128 30 9951--1281 0,147 26 9951-1471 0.154 23 9951=1541 0.173 17 9951--1731 5,000 0.128 30 9951-1281 0,144 27 9951-1441 0.152 24 9951-1521 0.169 18 9951--1691 6,000 0.128 30 9951-1281 0.144 27 9951-1441 0.149 25 9951--1491 0.166 19 9981--1661 7,000 0.129 31 9951--1291 0.140 28 9951--1401 0.147 26 9951--1471 0.161 20 9951-1611 8,000 0.120 31 9951-1201 0.136 29 9951--1361 0.144 27 9951--1441 0.161 20 9951--1611 9,000 0.120 31 9951_-1201 0.136 29 9951--1361 0.140 28 9951--1401 0.157 22 9951-1571 10,000 0.116 32 9951--1161 0.128 30 9951--1281 0.136 29 9951--1361 0.152 24 9951-1521 PROPANE GAS 56,000--Input 70,000--Input 77,000--Input 90,000--Input Elevation Orifice Ddll Pa_ # Odfice Ddll Pad# Orifice Drill Odfice Ddll Dia. Size Dia. Size Dia. Size Pa_ # Dia. Size Pa_ # Sea Level 0.082 48 9951--0821 0.093 42 9951-0931 0.098 40 9951_-0981 0.106 36 9951-1061 2,000 0.081 46 9951--0811 0.093 42 9951-0931 0.096 41 9981-0961 0.104 37 9951--1041 3,000 0.078 47 9951--0781 0.089 43 9951-0891 0.093 42 9951-0931 0.101 38 9951--1011 4,000 0.078 47 9951--0781 0.089 43 9951--0891 0.093 42 9951--0931 0.101 38 9951-1011 5,000 0.078 47 9951--0781 0.089 43 995%-0891 0.093 42 9951--0931 0.099 39 9981--0991 6,000 0.076 48 9981--0761 0.086 44 9951--0861 0089 43 9951--0891 0.098 40 9951--0981 7,000 0.076 48 9951--0761 0.086 44 9951--0861 0.089 43 9951--0891 0.096 41 9951-0961 8,000 0,073 49 9951--0731 0.082 45 9951--0821 0.086 44 9951--0861 0.096 41 9951-0961 9,000 0.073 49 9951--0731 0.081 46 9951-0511 8.086 44 9951--0881 0.093 42 9951--0931 10,000 0.070 50 9951--0731 0.078 47 9951--0781 0.082 48 9951-6821 0.059 43 9981-0891 Table shows 4% Input Reduction per 1,000 feet Elevation. For Ca...

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