Votes - 3, Average rating: 4.3
(
)
)
|
manual abstract
Locate thermostat assembly on a solid wall in the conditioned space to sense average temperature in accordance with thermostat installation instructions. Route thermostat cable or equivalent single leads of colored wire from subbase terminals to low-voltage connections on unit (shown in Fig. 4) as described in Steps 1 through 3 below. NOTE: For wire runs up to 50 ft, use no. 18 AWG (American Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft, use no. 16 AWG insulated wire (35 C minimum). For over 75 ft, use no. 14 AWG insulated wire (35 C minimum). All wire larger than no. 18 AWG cannot be directly connected to the thermostat and will require a junction box and splice at the thermostat. 1. Connect thermostat wires to screw terminals of low-voltage connection board. 2. Pass the control wires through the hole provided in the comer post. 3. Feed wire through the raceway built into the comer post to the 24-v barrier located on the left side of the control box. See Fig. 5. The raceway provides the UL required clearance wiring. THERMOSTAT between the high- and low-voltage THERMOSTAT CONNECTIONS FOR STANDARD UNIT WIRING CONNECTIONS UNIT CONNECTION BOARD Fig. 4 — Control Wiring Connections HOLE IN END PANEL (HIDDEN) START-UP Preliminary Checks 1. Check that all internal wiring connections are tight and that all barriers, covers, and panels are in place. 2. Field electrical power source must agree with unit nameplate rating. 3. All service valves must be open. Leak Test — Test entire refrigerant system by using soap bubbles and/or an electronic leak detector. Evacuate and Dehydrate — Evacuate and dehydrate entire refrigerant system by use of the methods described in GTAC II, Module 4, System Dehydration. Refrigerant Charge — Refer to GTAC II, Module 5, Charging Recovery, Recycling and Reclamation. Unit panels must be in place when unit is operating during charging procedure. Unit is shipped with holding charge only. Weigh in 7 lbs R-22 to start unit. NO CHARGE — Use standard evacuating techniques. After evacuating system, weigh in the specified amount of refrigerant. (Refer to Table 1.) LOW CHARGE COOLING - Use Cooling Charging Chart, Fig. 6. Vary refrigerant until the conditions of the chart are met. Note the charging chart is different from type normally used. Chart is based on charging the units to the correct subcooling for the various operating conditions. Accurate pressure gage and temperature sensing device are required. Connect the pressure gage to the service port on the liquid line service valve. Mount the temperature sensing device on the liquid line, close to the liquid line service valve and insulate it so that outdoor ambient temperature does not affect the reading. Indoor-air cfm must be within the normal operating range of the unit. Operate unit and adjust charge to conform with charging chart, using liquid pressure and temperature to read chart. TO USE COOLING CHARGING CHART - Initially charge with 7 lbs. R-22. Place pressure gage at liquid line service valve. Install thermocouple to liquid line near the liquid line service valve. Operate unit. Plot liquid pressure and temperature on chart and add or reduce charge to meet curve. Fig. 5 - Field Control Wiring Raceway CHARGING CHART - 38AK007 OUTDOOR FAN MUST BE OPERAT INS / / / / / AC 3 » ftG ? F AS W : IS / / f / / V t / / / * XX £ :h uw £ IF « .1 U ut ve / / LIQUID PRESSURE AT LJOUI0 VALVE (PSI6J Fig. 6 — Cooling Charging Chart — 38AK007 5 Unit Preparation — Make sure that unit has been installed in accordance with installation instructions and applicable codes. Compressor Mounting — Compressors are internally spring mounted. Do not loosen or remove compressor holddown bolts. Internal Wiring — Check all electrical connections in unit control boxes; tighten as required. Time Guard II® Device — Time Guard II Circuit provides for a delay of approximately 5 minutes before restarting compressor after shutdown from safety device action. On start-up, the Time Guard timer causes a delay of approximately 15 seconds after thermostat closes. Refrigerant Service Ports — Each unit system may have Schrader type service 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. Cooling — Set space thermostat to OFF position. Set system selector switch at COOL position and fan switch at AUTO, position. Adjust the...