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470 CHAPTER20 1953 Guide' Fig. 4. Equivalent Length of Fittings (Concluded) GROUP 7. REGISTERS (INCLUDING LOSSES IN STACKHEAD AND VELOCITY PRESSURE). 25 EQ. FT.: FL. REC. & BOX ONLY Table 4A. Equivalent Length for Registers Deflection Angle A Baseboard, High or Low Sidewall' Registers -Floor Registers with Box only Eq. Ft. 35 For 2-way deflection registers, add the vertical and horizontal deflection angles together and multiply by 0.7. Select closest angle A in Table 4A. For diffuser type registers see manufactures' catalogs. settings are used for high sidewall register installations, and the higher settings for baseboard register installations. For most satisfactory results these settings should be as low as is feasible. .3. A protective high limit control to stop the flow of fuel to the burner independ ently of the thermostat if the air temperatureexceeds 175 F. 4. On oil and gas burner installations, a protective control should be included to cut off the fuel supply if the fire is extinguished, or if there is a failure of the igni tion system. ' . 5. On automatic stoker installations, a control is usually included to operate thestoker regardless of thermostat settings whenever the bonnet temperature indicates . that the fire is dying, or a time interval contactor is used to cause the stoker to run a few minutes out of each hour. 6. A humidistat to regulate the moisture supplied to the rooms, located either in one of the rooms or in the main return dudt near the furnace. ADJUSTMENT OF SYSTEM FOR CONTINUOUS AIR CIRCULATION This procedure applies to the adjustment of an automatically-fired forced warm air heating system to provide continuous air circulation, when the control arrangement is of the type where the room thermostat controls the fire, and the blower control (fan switch) controls the blower operation. This procedure as outlined in detail in Manual 6 of the National Warn Air Heating and Air Conditioning Association, is as follows:7 1. Adjust the fuel input in proper relation to the heat loss of the structure. 2. Determine the temperature rise through the furnace. 3. Adjust the air volume to produce a temperature rise through the furnace of about 100 deg. 4. Adjust the fan switch differential to a minimum of about 15 deg. 5. Adjust the fan switch cut-out point as low as practicable. 6. Adjust the room thermostat temperature differential to a minimum which will cause the burner to cycle frequently. 7. Balance the system by adjusting dampers to produce even temperature distri bution between rooms. 3. Set the room thermostat at the desired room temperature. Forced Warm Air Systems 134 131 129 126 124 122 120 118 116 114 112 110 109 107 106 105 103 102 101 100 99 98 97 15.1 15.7 16.2 16.9 17.3 17.9 18,4 19.0 19.6 20.3 21.1 22.1 22.5 23.6 24.2 24.8 26.0 26.6 27.3 28.0 28.8 29.6 30.5 98 97 96 95 94 93 29.6 30.5 31.5 32.3 33.3 34.6 116 114 112 111 109 108 106 105 103 102 101 100 99 98 97 96 95 94 93 92 91 90 90 19.6 20.3 21.1 21.6 22.5 23.1 24.2 24.8 26.0 26.6 27.3 28.0 28.8| 29.6 30.5 31.5 32.3 33.3 34.6 35.9 37.3 38.6 38.6 240 87 42.7 o >os* a > 3 a Q- h ;> 2 to ' O Sh ^o * a a T053 g a Ss n - sg 2 11 St-s H o *4 1 go o t<Oa"S 0^_ 4S-i 2j * | C| H fc e aa wa 03 < H 126 123 121 119 117 115 113 111 110 108 107 105 104 103 102 101 16.9 17.6 18.1 18.7 19.3 20.0 20.7 21.6 22.1 23.1 23.6 24.8 25.4 26.0 26.6 27.3 | 190 90 90 38.6 38.6 9O4 CO 88 ^ CO 8 883 o o c5 i - o 91 37.3 89 39.9 89 39.9 00 03CO*OA 92 35.9 93 34.6 94 33.3 o 95 32.3 1 120 e 98 97 96 29.6i 30.5 31.5 100 101 100 99 27.31 28. o! 28.8 e 102 26.6 o QO tO<0 s o 103 26.0 104 25.4 106 24.2 o CO 107 23.6 C* jO o 00 o 00 28 SI 120 18.4 130 128 15.9 16.4 140 137 14.0 14.6 c-oi SO 160 147 143 140 137 134 131 129 127 124 122 120 118 12.6 12.9 13.5 14.0 14.6 15.1 15.7 16.2 16.6 17.3 17.9 18.5 18.4 114 112 110 109 107 106 20.3 21.1 22.1 22.5 23.6 24.2 103 102 101 100 26.0 26.6 27.3 28.0 O '61 811 rzz on J 'K 901 8'frZ SOI -091 j 160 166 152 149 145 142 139 136 133 130 128 126 123 121 119 117 115 113 112 110 108 107 11.4 11.8 12.3 12.7 13.2 13.7 14.2 14.8 15.3 15.9 16.4 16.9 17.6 18.1 18.7 19.3 20.0 20.7 21.1 22.1 23.1 23,6 104 103 25.4 26.0 170 10.6 180 175 9.7 10.0 161 157 153 150 146 143 140 137 134 131 128 126 124 122 120 118 116 114 112 11.3 11.7 12.2 12.6 13.1 13.5 14.0 14.6 15.1 15.7 16.4 16.9 17.3 17.9 18.4 19.0 19.6 20.3 21.1 109 107 106 22.5 23.6 24.2 801 991 170 166 161 157 153 150 146 143 140 137 135 131 128 126 124 122 120 118 116 115 113 111 n o 10.5 10.8 11.3 11.7 12.2 12.6 13.1 13.5 14.0 14.6 14.9 15.7 16.4 16.9 17.3 17.9 18.4 19.0 19.6 20.0 20.7 21.6 22.1 V II 901 091 691 200 8.6 * Register delivery volumes in oolumn 1 for zero length of duct. 116 19.6 135 132 129 127 125 122 120 14.9 15.5 16.2 16.6 17.2 17.9 18.4 156 153 149 145 142 139 136 133 130 128 126 124 121 119 117 115 113 1 112 11.8 12.2 12.7 13.2 13.7 14.2 14.7 16.3 15.9 16.4 16.9 17.3 18.1 18.7 19.3 20.0 20.7 21.1 471 38 00 CO Tf 171 167 163 158 154 151 147 144 140 10.4 10.7 111 11.6 12.1 12.4 12.9 13.4 14.0 165 10.9 ct-o y-4 174 10.1 C4C0 00 CO 00 y* 3^ Y--03 o CO <HOO Register temperature, Fahrenheit. (Use upper value in each group). 1Register delivery volume in cubio feet per minute per 1000 Btu. (Use lower value in each group).