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Производитель: Carrier Размер: 1.22 mb Название файла: 48e-5si~1.pdf Язык инструкции:

10. Return power to unit. Disable Economizer — For applications where the economizer will not be used (areas of high humidity), the economizer should be disabled. To disable the economizer, perform the following: 1. Turn of power. Lock out disconnect. 2. Locate the OAT (Outdoor Air Thermostat) in the right hand outdoor air damper area. 3. Locate the splice connecting the violet wire coming from T24 on the base module board to the red wire coming from T29 on the base module board. Remove the wire nut and break the red to violet wire splice. 4. Cap off both wires. When the connection is broken the base module is fooled into thinking that the enthalpy is not acceptable and economizer operation is disabled. HH57AC077 ENTHALPY CONTROL + C7400A1004 HH57AC078 ENTHALPY SENSOR (USED WITH ENTHALPY CONTROL FOR DIFFERENTIAL ENTHALPY OPERATION) Fig. 33 — Differential Enthalpy Control and Sensor 27 CONTROLCURVECONTROLPOINT(APPROX.DEG.) AT50%RHA73(23) B70(21) C67(19) D63(17) NOTE: Switches shown in high enthalpy state. Terminals 2 and 3 close on enthalpy decrease. Fig. 34 — Wiring Connections for Solid-State Enthalpy Control (HH57AC077) RH — Relative Humidity Fig. 35 — Psychrometric Chart for Enthalpy Control NOTE: Partitions shown indicate both side supply (EW/EY) and vertical supply (EJ/EK) units. Fig. 36 — Economizer Details 28 Step 10 — Position Power Exhaust/Barometric Relief Damper Hood — All electrical connections have been made and adjusted at the factory. The power exhaust blowers and barometric relief dampers are shipped assembled and tilted back into the unit for shipping. Brackets and extra screws are shipped in shrink wrap around the dampers. If ordered, each unit will have 4 power exhaust blowers and motors or 4 barometric relief dampers. 1. Remove 9 screws holding each damper assembly in place. See Fig. 37. Each damper assembly is secured with 3 screws on each side and 3 screws along the bottom. Save screws. Be careful when tilting blower assembly. Hoods and blowers are heavy and can cause injury if dropped. 2. Pivot each damper assembly outward until edges of damper assembly rest against inside wall of unit. 3. Secure each damper assembly to unit with 6 screws across top (3 screws provided) and bottom (3 screws from Step 1) of damper. 4. With screws saved from Step 1, install brackets on each side of damper assembly. 5. Remove tape from damper blades. VAV DUCT PRESSURE TRANSDUCER — The VAV duct pressure transducer (VAV inverter pressure transducer) is located behind the filter access door on the lower inner panel. See Fig. 38. A section of field-supplied 1.4-in. plastic tubing must be run from the high pressure tap on the differential pressure switch and connected to a field-supplied tap in the supply-air duct. The tap is usually located 2.3 of the way out on the main supply duct. Remove plug button in panel to route tubing. The low pressure tap is factory-routed to the atmosphere. For a positive-pressure building, route the high tap to building air and low tap to atmosphere. For a negative- pressure building, route the high tap to atmosphere and the low tap to building air. VAV BUILDING PRESSURE TRANSDUCER — The VAV building pressure transducer (modulating power exhaust pressure transducer) is located behind the filter access door on the lower inner panel. See Fig. 38. A section of field- supplied 1.4-in. plastic tubing must be run from the high pressure tap on the differential pressure switch to the conditioned space. The pressure tube must be terminated in the conditioned space where a constant pressure is required. This location is usually in an entrance lobby so that the building exterior doors will open and close properly. Remove plug button in panel to route tubing. The low pressure tap is factory-routed to the atmosphere. For a positive-pressure building, route the high tap to building air and low tap to atmosphere. For a negative- pressure building, route the high tap to atmosphere and the low tap to building air. NOTES: 1. Unless otherwise specified, all dimensions are to outside of part. 2. Dimensions are in inches. 3. On 48EW,EY units, accessory barometric relief or power exhaust must be mounted in the field-supplied return ductwork. Fig. 37 — Barometric Relief Damper and Power Exhaust Mounting Details 29 Step 11 — Install All Accessories — After all the factory-installed options have been adjusted, install all field- installed accessories. Refer to the accessory installation instructions included with each accessory. MOTORMASTER. III INSTALLATION Install Field-Fabricated Wind Baffles — Wind baffles must be field-fabricated for all units to ensure proper cooling cycle operation at low-ambient temperatures. See Fig. 39 for baffle details. Use 20-gage, galvanized sheet metal, or similar corrosion-resistant metal for baffles. Use field-supplied screws to attach baffles to unit. Screws should be 1.4-in. diameter and 5.8-in. long. Holes for wind baffles are pre-punched in the unit sheet metal. To av...

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