Оценок - 1, средний балл: 4
(
)
)
|
Фрагмент инструкции
Check for proper grounding wires and power line phasing 548J 548J 548J if the GFCI receptacle does not trip as required. Press the RESET button to clear the tripped condition. CO8283 PRIMARY TRANSFORMER CONNECTIONS TERMINALS L1: RED +YEL H1 + H3 L2:BLU+GRA H2+H4 L1: RED H1 Splice BLU + YEL H2 + H3 L2: GRA H4 L1: RED H1 UNITVOLTAGECONNECTAS208,230240460480575 600 L2: GRA H2 Fig. 24 - --Powered Convenience Outlet Wiring Maintenance: Periodically test the GFCI receptacle by pressing the TEST button on the face of the receptacle. This should cause the internal circuit of the receptacle to trip and open the receptacle. Check for proper grounding wires and power line phasing if the GFCI receptacle does not trip as required. Press the RESET button to clear the tripped condition. Fuse on powered type: The factory fuse is a Bussman “Fusetron” T- --15, non- --renewable screw- --in (Edison base) type plug fuse. Using unit- --mounted convenience outlets: Units with unit- --mounted convenience outlet circuits will often require that two disconnects be opened to de- --energize all power to the unit. Treat all units as electrically energized until the convenience outlet power is also checked and de- --energization is confirmed. Observe National Electrical Code Article 210, Branch Circuits, for use of convenience outlets. HEAT PUMP CONTROLS Controls Terminal Board The Controls Terminal Board (CTB) is a large printed circuit board that is located in the center of the unit control box. This printed circuit board contains multiple termination strips and connectors to simplify factory control box wiring and field control connections. Terminals are clearly marked on the board surface. See Fig 25. The CTB contains no software and no logic. But it does include seven configuration jumpers that are cut to configure the board to read external optional and accessory controls, including that the unit is a heat pump. C09274 Fig. 25 - --Controls Terminal Board (CTB) Table 7 – Jumper Configuration Control Function Note Phase Monitor Occupancy Control Smoke Detector Shutdown Remote Shutdown Heat Pump / Reheat 548J default: Cut Heat Pump / Reheat 548J default: Cut JumperJMP1JMP2JMP3JMP4JMP5JMP6JMP7 Heat Pump / Reheat 548J default: Cut Jumpers JMP5, JMP6 and JMP7 are located in notches across the top of the CTB (see Fig. 25 ). These jumpers are factory cut on all heat pump units. Visually check these jumpers to confirm that they have been cut. PROTECTIVE CONTROLS Compressor Protection Overcurrent The compressor has internal linebreak motor protection. 20 Overtemperature The compressor has an internal protector to protect it against excessively high discharge gas temperatures. High Pressure Switch The system is provided with a high pressure switch mounted on the discharge line. The switch is stem- --mounted and brazed into the discharge tube. Trip setting is 630 psig +/- --10 psig (4344 +/- --69 kPa) when hot. Reset is automatic at 505 psig (3482 kPa). Loss of Charge Switch The system is protected against a loss of charge and low evaporator coil loading condition by a loss of charge switch located on the liquid line and a freeze protection thermostat on the indoor coil. The switch is stem- --mounted. Loss of Charge Switch trip setting is 27 psig +/- --3 psig (186 +/- --21 kPa). Reset is automatic at 44 +/- --3 psig (303 +/- --21 kPa). Freeze Protection Thermostat trip setting is 30_F+/- --5_F (--1_C+/- --3_C). Reset is automatic at 45_F+/- --5_F(7_C +/- --3_C). Supply (Indoor) Fan Motor Protection Disconnect and lockout power when servicing fan motor. 2.9 and 3.7 bhp motors are equipped with an overtemperature or protection device. The type of device depends on the motor size. See Table 8. Table 8 – Overload Device per Motor Size Overload Device Reset Internal Linebreak Automatic Internal Linebreak Automatic Thermix Automatic Thermix Automatic External MotorSize(bhp) 1.72.42.93.74.7 Manual (Circuit Breaker) The High Static option supply fan motor is equipped with a pilot- --circuit Thermix combination overtemperature/ overcurrent protection device. This device resets automatically. Do not bypass this switch to correct trouble. Determine the cause and correct it. The Thermix device is a snap- --action overtemperature protection device that is imbedded in the motor windings. It is a pilot- --circuit device that is wired into the unit’s 24–v control circuit. When this switch reaches its trip setpoint, it opens the 24–v control circuit and causes all unit operation to cease. This device resets automatically when the motor windings cool. Do not bypass this switch to correct trouble. Determine the cause and correct it. The External motor overload device is a specially- --calibrated circuit breaker that is UL recognized as a motor overload controller. It is an overcurrent device. When the motor current exceeds the circuit breaker setpoint, the device opens all motor power leads and the motor shuts down. Reset requires a manual reset at the overload...