Document QGQqRr1VQnwoogx5YaXggag4

CHAPTER 20 1954 Guide 472 Fig! 4. Equivalent Length of Fittings (Concluded) CROUP 7. REGISTERS (INCLUDING LOSSES IN STACKHEAD AMO VELOCITY PRESSURE). deflection ANCLE t.25 EQ. FT. FL. REC. BOX ONLY Table 4A. Equivalent Length fob Registers Deflection Angle A Baseboard, High or Low Sidewall Registers_______________ Eq. Ft. 35 15' 45 115 fFlolowor IRVeCggiwsteevriso w...it.h-----B---o---x-..o.n,ly For 2-way deflection registers, add the vertical and horizontal deflection angles together and multiply Iby 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'3a.sAlopwroatseicstifveeashiibglhe.limit control to stop the flow of fuel to the burner independ- ently of the thermostat if the air temperature exceeds 175 F. 4. Oh 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 the. | stoker 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 j one of the rooms or in the main return duct near the furnace. .. jADJUSTMENT 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- j This procedure as outlined in detail in Manual 6 of the National Warm, Air 1 Heating and Air Conditioning Association, is as follows:7 1. Adjust the fuel input in proper relation to the heat loss of the structure. r-TT; 2. Determine the temperature rise through the furnace. J.i ; i 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. .ii> 7. Balance the system by adjusting dampers to produce even temperature distn-' bution between rooms. 8. Set the room thermostat at the desired room temperature.