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Фрагмент инструкции
In areas where the winter temperatures are low, a 30 minute setting is recommended. The heat pump is equipped with an electronic defrost control. This solid state defrost control . operatesinconjunctionwithanextemal sensorlocatedata"cold"spotontheoutdoor coil. The control operates on a "Time/Temp" toinitiateand"Temp"toterminatethecycle. The control will initiate a defrost cycle every60minutes(setbythefactory)ifthecoiltemperature atthesensor is approximately 35"F or less. As the coil is being defrosted, its temperature will rise until it reachesapproximately65°F. Atthispointthesensorwillterminatethedefrost cycle. The entire process will take between one and three minutes. In areas where the air is generally moisture laden and frost is prevalent, the defrost interval time may be shortened from 60 minutes to 30 minutes by simply moving the jumper wire (see figure 3) from the "T2" pin to the "1"1". In the event of a failure of the sensor to open to terminate the defrost, the control has a built-in lr minute maximum defrost time, after which it will automatically end the defrost cycle. 4. A field check-out of the defrost control board can be made by the following steps: 1. Attach a "jumper"wire across the two terminals of the sensor wires (see wiring diagrams on pages 11 through 14 showing the sensor being wired to the =COM" terminal of the defrost control board). = Attach a "jumper" wire across the two "TST" terminals. The timing cycles are divided by a factor of 256. (e.g. 90 minutes is reduced to 21.1 seconds, 60 minutes to 14 seconds and 30 minutes to 7 seconds). At "T1" setting the unit should go into defrost in 7 seconds. For this test, the unit will stay in "defrost" for only about 2 to 3 seconds due to the 10 minute override. (L_. = 2.3 seconds) TST HLD 24V OUT COM (_) °°° H flflH 0 0 T3 T2 T1. JUMPER WIRE FIGURE 3 T3 = 90, T2 = 60, T1 = 30 -7 Vl. ELECTRICAL OPERATION COOUNG CYCLE With the disconnect on "ON" position, voltage is supplied to the primary of the control transformer and crankcase heater. The control transformer reduces the voltage from 230 or 208 to 24 volts for the low voltage and the thermostat circuit. With a single-stage cool/single-stage heat t_Lh_mostat set in the cooling _o_ition, current is supplied from one side of the 24 volt secondary of the control transformer to the "R" terminal of the thermostat. The other side of this transformer connects to the main contractor coil through the high pressure control. When the thermostat calls for"COOLING', current from the "R" terminal is switched on to the =Y" terminal causing the compressor contactor to be energized. The main contactor closes the contacts in the high voltage circuit. The completion of this circuit will start both the outdoor fan motor and the compressor. The indoor fan relay which is internally wired from "G" to "Y" in the thermostat sub-base is also energized and starts the indoor fan motor. The system will operate normally and begin to cool. HEATING CYCLE With the thermostat set in the heating mode, the "B" terminal energizes the reversing valve relay. With a call for heat the compressor contactor is energized "W" to =Y"through the jumper wire in the control panel. The indoor and outdoor fan motors are started in the same manner as in the cooling cycle. The reversing valve is always energized whenever the system switch on the thermostat is in the heat position. This eliminates the =swish" at the end of each cycle. Only in the de-ice cycle will the "swish" occur. VII. RESISTANCE HEATERS Resistance heaters are available as an optional field-installed accessory for self-contained heat pumps. Resistance heaters are recommended for areas where winters are severe, because as the outdoor temperature falls, the amount of heat available in the air decreases, making it more difficult to capture. This fact of nature causes the heat pump capacity to fall at a time when the heating requirement rises. Resistance heaters can compensate for this difference in capacity. Heat pumps with resistance heaters require a single-stage cool/two-stage heat thermostat. With the two-stage thermostat, the resistance heaters are energized if the thermostat is turned more than two degrees higher than the indoor temperature, or the indoor temperature falls more than two degrees below the thermostat setting. The heaters will also be energized during the defrost cycle. "8-_ VIII. OPERATION AND MAINTENANCE 1. Be sure the filter is clean. Inspect every 30 days of operation; if obstructed, clean or replace filter at once. DO NOT RUN WITHOUT A FILTER. 2. Always let the thermostat control the operation of the system. Never try to "second guess" the thermostat, or tamPer with it. Jus[ s_=tthe thermostat at the comfort level desired AND LEAVE IT ALONE. If it gets too chilly, just turn the thermostat up a degree at a time until the desired level is achieved. Don't turn the thermostat back and forth. 3. Heat pumps cannot cool off a house as fast as a furnace heats i...
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