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A 3/4" Open End wrench is required to take off the valve stem cap. 9. The liquid line shut-offvalve can now be opened. Remove shut-offvalve cap. Fully insert hex wrench into the stem and backout counterclockwise until valve stem just touches rolled edge (approximately five [5] turns) observing WARNING statement on page 2. See Figure 3. |nstaI|er's Guide 10. Replace liquid service pressure tap port cap and valve stem cap. These caps MUST BE REPLACED to prevent leaks. Replace valve stem and pressure tap cap finger tight, then tighten an additional 1/6 turn. 11. The gas valve can now be opened. Open the gas valve by removing the shut-off valve cap and turning the valve stem 1/4 turn counterclockwise, using 1/4" Open End or Adjustable wrench. See Figure 4. 12. The gas valve is now open for refrigerant flow. Replace valve stem cap to prevent leaks. Again, these caps MUST BE REPLACED to prevent leaks. Replace valve stem and pressure tap cap finger tight, then tighten an additional 1/6 turn. See Figure 4. If refrigerant lines are longer than 15 f_et and/or a difi_rent size than recommended, it will be necessary to adjust system refrigerant charge upon completion of installation. See unit Service Facts. E. ELECTRICAL CONNECTIONS When installing or servicing this equipment, ALWAYS exercise basic safety precautions to avoid the possibility of electric shock. 1. Power -wiring and grounding of equipment must comply with local codes. 2. Power supply must agree with equipment nameplate. 3. Install a separate disconnect switch at the outdoor unit. 4. Ground the outdoor unit per local code requirements. 5. Provide flexible electrical conduit whenever vibration transmission may create a noise problem within the structure. 6. The use of color coded low voltage wire is recommended to simplify connections between the outdoor unit, the thermostat and the indoor unit. Table 1 --NEC Class II Control Wiring 24 VOLTS WIRE SIZE MAX. WIRE LENGTH 18 AWG 150 FT 16 AWG 225 FT. 14 AWG 300 FT. 7. Table i defines maximum total length of low voltage wiring from outdoor unit, to indoor unit, and to thermostat. 8. Mount the indoor thermostat in accordance with instruction included with the thermostat. Wire per appropriate hook-up diagram (included in these instructions). F. DEFROST CONTROL The demand defrost control measures heat pump outdoor ambient temperature -with a sensor located outside the outdoor coil. A second sensor located on the outdoor coil is used to measure the coil temperature. The difference between the ambient and the colder coil temperature is the difference or delta-T measurement. This delta-T measurement is representative of the operating state and relative capacity of the heat pump system. By measuring the change in delta-T, we can determine the need for defrost. The coil sensor also serves to sense outdoor coil temperature for termination of the defrost cycle. FAULT IDENTIFICATION A fault condition is indicated by the flashing light on the defrost control inside the heat pump control box. In normal operation, the defrost control light will flash once each second. If the light is flashing more than once per second or not at all, refer to the service manual for that unit. PIN IDENTIFICATION (See Figure 5.) 1. TEST COMMON (Shorting any of the other pins to this pin causes the function of the other pin to be executed. Leaving this pin open results in the normal mode of operation.) 2. TST = Test (Shorting TEST_COMMON to this pin speeds up all defrost board timings.) 3. FRC_DFT = Forced Defrost (Short TEST_COMMON to this pin for two (2) seconds to initiate a forced defrost. Remove the short after defrost initiates.) 4. LOW_FAN = Low speed Fan test mode (Short TEST_COMMON to this pin to force the outdoor fan to low speed. When the short is removed, the fan will go to high speed for approximately 15 seconds and then return to the speed it was running before the short was applied.) DEFROST CONTROL CHECKOUT Normal operation requires...

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