Model
Electrical Connections (cont.)
Connect Control Wiring
1.Route 24 volt control wires through control wiring grommet and connect leads to control wiring.
2.Use No. 18 AWG color coded, insulated wire. If thermostat is located more than 100 ft. from unit, as measured along the control voltage wires, use No. 16 AWG wire to avoid excessive voltage drop.
3.All wiring must be NEC Class 1 and must be separated from incoming power leads. Use furnace transformer, fan coil transformer, or accessory transformer for control power.
Note: Use of available 24 volt accessories may exceed the minimum power requirement. Determine total transformer load and increase the transformer capacity or split the load with an accessory transformer as required.
Final wiring check
Check factory wiring and field wire connections to ensure terminations are secured properly. Check wire routing to ensure wires are not in contact with tubing, sheet metal, etc.
SERVICE VALVE CONNECTIONS
Braze joints
1.Remove the valve core from the schrader port. Wrap a quenching cloth around the service valve. Clean and flux the joint and braze with brazing rod containing at least 10% silver (such as silphos type brazing rod). DO NOT USE SOFT SOLDER. Replace the schrader valve core after brazing has cooled.
2.
WARNING
DO NOT USE AIR TO
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Torch | Service |
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| valve |
Brazing rod |
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| Quenching Cloth |
WARNING
ALWAYS HAVE A FIRE EXTINGUISHER AVAILABLE WHEN WORKING WITH AN OPEN FLAME.
ALWAYS USE SAFETY GLASSES, PROTECTIVE CLOTHING, AND WORK GLOVES.
Evacuation
The outdoor unit is factory charged. Evacuation is necessary on the uncharged portions of the total system. Purge the system with dry nitrogen. Then connect a vacuum pump and a vacuum gage capable of accurately measuring below 1,000 microns vacuum depth. The deep vacuum method is the most positive way of assuring a system is free of air and liquid water.
WARNING
IF THE INSTALLER IS MAKING UP HIS OWN LINE SETS, HE MUST MAKE SURE THE TUBING IS CLEAN OF ANY IMPURITIES OR MOISTURE.
Opening the Service Valve (Step Valve)
NOTE: This is not a
1.Remove the valve cap using an adjustable wrench.
2.Open the valve by inserting a hex wrench (3/16" for the liquid line, 5/16" for the vapor line) into the stem and back out
3.Replace the valve cap
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| Schrader |
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| valve port |
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Remove cap | Open valve | Replace cap |
Opening the Service Valve (Straight Valve)
NOTE: This is not a
Open the valve by using an adjustable wrench to turn the adjusting flange 1/4 turn
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Adjusting flange
Open valve
3