Assessments - 2, GPA: 4.5 ( )

Fabricante : Carrier Arquivo Tamanho: 2.43 mb Arquivo Nome : Língua de Ensino:

Do not loosen or remove compressor holddown bolts. Internal Wiring — Check all electrical connections in unit control boxes. Tighten as required. Refrigerant Service Ports — Each unit system has 3 Schrader-type service gage ports: one on the suction line, one on the liquid line, and one on the compressor discharge line. Be sure that caps on the ports are tight. One Schrader-type valve is located under both the high-pressure switch and the low-pressure switch. Cooling — Set space thermostat to OFF position. To start unit, turn on main power supply. Set system selector switch at COOL position and fan switch at AUTO, position. Adjust thermostat to a setting below room temperature. Compressor starts on closure of contactor. Check unit charge. Refer to Service, Refrigerant Charge section, page 22. Reset thermostat at a position above room temperature. Compressor will shut off. Evaporator fan will shut off after 30 second delay. TO SHUT OFF UNIT — Set system selector switch at OFF position. Resetting thermostat at a position above room temperature shuts unit off temporarily until space temperature exceeds thermostat setting. Main Burners — Main burners are factory set and should require no adjustment. TO CHECK ignition of main burners and heating controls, move thermostat set point above room temperature and verify that the burners light and evaporator fan is energized. After ensuring that the unit continues to heat the building, lower the thermostat setting below room temperature and verify that the burners and evaporator fan turn off. (Fan will turn off only if fan selector switch is in the AUTO, position.) Refer to Table 16 for the correct orifice to use at high altitudes. Heating 1. Purge gas supply line of air by opening union ahead of gas valve. If gas odor is detected, tighten union and wait 5 minutes before proceeding. 2. Turn on electrical supply and manual gas valve. 3. Set system switch selector at HEAT position and fan switch at AUTO, or ON position. Set heating temperature lever above room temperature. 4. The induced draft motor will start. 5. After a call for heating, the main burners should light within 5 seconds. If the burner does not light, then there is a 22 second delay before another 5-second try. If the burner still does not light, the time delay is repeated. If the burner does not light within 15 minutes, there is a lockout. To reset the control, break the 24 v power to Wl. 6. The evaporator-fan motor will turn on 45 seconds after the burners are ignited. 7. The evaporator-fan motor will turn off 45 seconds after thermostat temperature is satisfied. 8. Adjust airflow to obtain a temperature rise within the range specified on the unit nameplate. NOTE: The default value for the evaporator-fan motor ON and OFF delay is 45 seconds. The Integrated Gas Unit Controller (IGC) modifies this value when abnormal limit switch cycles occur. Based upon unit operating conditions, the ON delay can be reduced to 0 seconds and the OFF delay can be extended to 180 seconds. Table 16 — Altitude Compensation* ELEVATION (ft) 74,000 AND 115,000 BTUH NOMINAL INPUT 150,000 BTUH NOMINAL INPUT Natural Gas Orifice Sizef Liquid Propane Orifice Sizet Natural Gas Orifice Sizef Liquid Propane Orifice Sizet 0-2,000 33 43 30 38 2,000 34 43 30 39 3,000 35 44 31 40 4,000 36 44 32 41 5,000 36 44 33 42 6,000 37 45 34 43 7,000 37 45 35 43 8,000 38 46 36 44 9,000 39 47 37 44 10,000 41 48 38 45 11,000 43 48 39 45 12,000 44 49 40 46 13,000 44 49 41 47 14,000 45 50 42 47 *As the height above sea level increases, there is less oxygen per cubic foot of air Therefore, heat input rate should be reduced at higher altitudes. tOrifices available through your Carrier distributor TO SHUT OFF UNIT — Set system selector switch at OFF position. Resetting heating selector lever below room temperature will temporarily shut unit off until space temperature falls below thermostat setting. Safety Relief — A soft solder joint at the suction service Schrader port provides pressure relief under abnormal temperature and pressure conditions (i.e., fire in building). Ventilation (Continuous Fan) — Set fan and system selector switches at ON and OFF positions, respectively. Evaporator fan operates continuously to provide constant air circulation. When the evaporator-fan selector switch is turned to the OFF position, there is a 30 second delay before the fan turns off. Operating Sequence COOLING, UNITS WITHOUT ECONOMIZER - When thermostat calls for cooling, terminals G and Y1 are energized, and the indoor (evaporator) fan motor (IFM), compressor, and outdoor (condenser) fan motor (OFM) start. The OFM runs continuously while the unit is in cooling. When the thermostat is satisfied, C is deenergized and the compressor and OFM shut off. After a 30 second delay, the IFM shuts off. If the thermostat fan selector switch is in the ON position, the evaporator motor will run continuously. 20 HEATING, UNITS WITHOUT ECO...

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