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Фрагмент инструкции
Check with the gas utility for the Btu valve and specific gravity of gas in the area. TABLE IV—MANIFOLD PRESSURE (Inches w.c.) Specific Gravity 0.59 0.61 0.63 0.65 0.67 0) 3 900 3.9” 4.0” 4.1” 4.2” 4.3” > 950 3.5” 3.6” 3.7” CO CO 3.9” 3 1000 3.1” 3.2” 3.3” 3.4” 3.5” H m 1025 3.0” 3.1” 3.2” 3.3” 3.4” 1050 2.8” 2.9” 3.0” 3.1” 3.2” 1100 2.6” 2.7” 2.8” 2.9” 3.0” Adjusting Pressure Regulator If the measured and rated input are not approximately the same, the gas pressure regulator may be adjusted as follows:. To increase input. Remove regulator sealing cap and turn gas pressure regulator adjusting screw clockwise. To decrease input. Remove regulator sealing cap and turn gas pressure adjusting screw counterclockwise. Checking Propane Gas Input The burner orifices are sized for rated input with a manifold pressure of 11.0” w.c. for propane gas. Connect a manometer of the 1/8” pressure tap on the chiller manifold gas valve. With the burners fired, adjust regulator at the supply tank to provide a pressure of 11.0” w.c. Check manifold pressure of each chiller. Cheek the furnace manifold pressure to see that it is also 11.0 inches w.c. Burner Adjustment To adjust the primary air to each burner, partially close the air shutter until there is a slight yellow tip at the top of each flame, then open the air shutter until the yellow tip just disappears. This should be done after the burners have been operating at full input for 5 minutes. VIII. FURNACE OPERATION In order to check the furnace for proper performance, the following sequence of control operation is given. CAUTION: The pilot valve and main burner manual valve must be closed for at least five minutes before starting the furnace. 1. Set the thermostat system switch to “heat”, set the fan switch to “auto” and set the thermostat below room temperature. 2. Turn on electrical power to the unit. 3. Open pilot gas valve. Gas will flow to the pressure switch and to the pilot. The electrical contacts in the pressure switch close, energizing the reignition coil which ignites the pilot gas. (Natural gas only; pilots on propane unit must be lighted manually per instruction on rating plate.) The pilot flame causes the monometal contacts in the Bryant 733 pilot to “Break” the re-ignition coil circuit -7- and “make” the circuit to, but not through, the first stage gas valve. On propane units, with themocouple energized, the pilot relay switch action makes the circuit to gas valve. 4. Set the thermostat above room temperature. This completes the circuit and energizes the gas valve. 5. Gas flows through the gas valve to the burners via bypass where it ignites. If the conditioned space temperature continues to drop, the second stage of the thermostat closes and opens the second gas valve bringing the unit to full input. With the furnace operating, make the following checks: The automatic pilot should turn the main gas off if the pilot flame goes out. Check this while the furnace is operating by shutting off the pilot gas. The main burners should shutdown. Allow the furnace to cool and the blowers to stop, then check the upper limit switch. Limit Control The furnace is equipped with a lower and upper limit control. When the lower limit opens, the first stage gas valve is de-energized, shutting off the gas. The upper limit control has a dual function; its primary action is to shut off the first stage gas valve if the unit overheats; as the gas valve is shut off, the fan delay relay is energized, starting the blower. The upper limit is a single pole double throw switch. The recommended method for checking the limit controls is to gradually block off the return air after the furnace has been operating for a period of at least five minutes. As soon as the limit has proven safe, the return air openings should be unblocked to allow normal air circulation through the unit. Whether or not the limit is functioning properly, and will “fail-safe” in case of motor failure or overheating of the unit can be determined using this method. Fan Relay The unit is equipped with a fan delay relay switch located in the control box. When the observer faces the control, the adjustment lever is moved upward to lengthen the off cycle. When the off cycle is lengthened, the on cycle is shortened automatically. Reverse the process to shorten the off cycle. Airflow and Temperature Rise The temperature rise is the difference between the temperature of the air in the return duct and that in the discharge duct near the furnace. This temperature rise, measured after equilibrium has been attained (approximately five minutes), should be within the range of 45°F to 75°F for Model 180-479 and 20°F to 50°F for Model 240-479. An adjustable sheave on the blower motor pulley is used to adjust the blower speed as follows: CAUTION: Turn off electric power to unit before removing or replacing blower belt. Proceed as follows: r 1. Loosen the motor from the base and slide t...
Эта инструкция также подходит к моделям:Кондиционеры - 39479D8 (1.04 mb)