valutazioni - 3, GPA: 3.7
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Facilità d'uso
Turn on clothes dryers and any appliance not connected to the common venting system. Turn on exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers. 4. Following the lighting instructions, place the unit being inspected in operation. Adjust the thermostat so the appliance will operate continuously. 5. Test for spillage at the draft control relief opening after 5 minutes of main burner operation. Use the flame of a match or candle. 6. Follow the preceding steps for each appliance connected to the common venting system. 7. After it has been determined that each appliance remaining connected to the common venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers, and any other fuel burning appliance to their previous condition of use. 8. If improper venting is observed during any of the above tests, the common venting system must be corrected. See National Fuel Gas Code, ANSI Z223.1 (latest edition) or CAN/CGA B149.1 & .2 Canadian Installation Codes to correct improper operation of common venting system. Heater Kit Accessory Installation Heater Kit Heater Blockoff Heater Compartment Access Panel Figure 7 OPERATION Sequence of Operation Cooling Upon cooling demand, the thermostat closes circuit R and Y. Closing R and Y closes the unit contactor, starting the compressor and outdoor fan. The thermostat automatically closes R to G circuit which also brings on the indoor blower at the same time. Upon satisfying cooling demand, the thermostat will open the above circuits and open the main contactor, stopping the compressor and outdoor fan. If the unit is equipped with a delay timer, the blower will continue to operate for 90 seconds which improves system efficiency. Circulating Air Blower Depending on the package unit model, the blower motor will be either a multi-tap PSC motor or a variable speed motor. PSC Motor The circulating air blower is controlled by a timing circuit in the blower control. Timings are not adjustable. There is no blower “on” delay after a call for heating or cooling. Blower “off” delay is 90 seconds after the thermostat is satisfied. Variable Speed Motor Units equipped with a variable speed circulation air blower motor will deliver a constant airflow within a wide range of external static pressures. Other features of this variable speed motor include: Soft Start/Stop – The variable speed motor will slowly ramp up to normal operating speed. This minimizes noise and increases comfort by eliminating the initial blasts of air encountered with standard motors. At the end of a cooling or heating cycle, the motor will slowly ramp down. Circulation Airflow Adjustments – The controls include a variable speed motor interface board. The ADJUST tap can be used to raise (+) or lower (–) the airflow by 15%. Heating and Cooling Airflows – The units are factory set for the correct heating and cooling airflows. However, airflow changes can be made by moving the position of the HEAT and COOL taps (see Table 4). Continuous Blower – The comfort level of the living space can be enhanced when using this feature by allowing continuous circulation of air between calls for cooling or heating. The continuous circulation of air occurs at half the full cooling airflow rate. To use this feature, place the thermostat fan switch into the ON position. Cooling Airflow Ramp Up – At the beginning of a call for cooling, the blower will run at 80% of full airflow for 7.5 minutes. This improves the system’s moisture removal and saves blower power during cooling start. Reduced Airflow Operation (Dehumidification) – For situations where humidity control is an issue, the variable speed motor can be connected to operate at a 25% reduction in the normal airflow rate. The variable speed motor interface board provides for connection of a humidistat on the HUM terminal. When a humidistat is connected, the dehumidifier resistor on the interface must be cut. The humidistat should be wired to open during high humidity, which will reduce blower airflow. Adjusting Airflow (Variable Speed Motor Equipped Units Only) DEHUMIDIFY CUT TO ENABLE COOLHEAT ADJUST NORM A B C D A B C D (+) (–) TEST D1 ADJUST, HEAT, and COOL Taps and Dehumidify Resistor on Interface Board Model Motor HP ADJUST Setting HEAT Setting COOL Setting CFM A CFM B CFM C CFM D Nominal Cooling kBTU Heating Size kW 24 5-10 1/3 NORM B B 1000 800 600 900 30 5-10 1/3 NORM A A 1000 800 600 900 36 5-15 1/2 NORM A A 1200 1000 800 1100 42 5-20 3/4 NORM C C 1800 1600 1400 1200 48 5-20 3/4 NORM B B 1800 1600 1400 1200 60 5-20 3/4 NORM A A 1800 1600 1400 1200 Table 3 506252-01 Issue 0902 Page 7 of 13 Cooling System Performance For maximum performance of the cooling system, operating temperatures and pressure should be checked. Superheat should be determined at Standard ARI test conditions of 82°F outdoor and 80°F indoor dry bulb/67°F we...
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