What is the toll-free number to enroll or to ask questions about Power Manager? The toll-free number to enroll or ask questions is 1-888-463-5022. What are the rewards for participating in Power Manager? Does the program decrease my electric bill? Typically, the energy usage on your bill remains the same since you are simply shifting your air conditioning usage to a different time of day. However, the amount on your bill will be reduced by the four monthly credits. For tips on how to decrease your summer air conditioning costs and increase your comfort, see our Power Manager Cool Tips. How can I help save the environment and help keep electric costs low? Demand is the amount of electricity needed at any given time. Power usage fluctuates hourly due to weather conditions, business hours of commercial and industrial companies and residential electric usage. When this combined demand is at its highest, it�s called the peak. How does Power Manager work?

At what times will my AC be cycled? What happens during a cycling event? How often will my air conditioner be cycled each summer? How long after I sign up will my switch be installed? Generally, your switch will be installed within 30 to 60 days after you enroll. Do I need to be home for the switch installation? You do not need to be home when your switch is installed. However, if you tell us that you have a locked gate or arrangements are needed for any animals, we will notify you 24 hours in advance of our installation schedule.window ac units for homes When will I receive my credits on my Duke Energy bill?ac unit cost for house You will receive the credits for the months of July, August, September, and October.how does an ac unit work in a car

What months do you install Power Manager devices? We install Power Manager devices all year long. Even though you earn the credits during the summer months, don�t wait until warm weather arrives to have your device installed. Having the device installed in cooler months ensures that your device will be installed and you won�t have to wait to start receiving monthly credits. How do I enroll? To enroll by phone, please call 1-888-463-5022. How do I know if my air conditioner is being cycled? The temperature in my home is warmer than normal and I am not sure if my air conditioner is working properly. Should I call my air conditioning contractor? If your home seems warmer than you expect, first call 1-800-832-3169 to hear a message on our cycling status. If your air conditioner is being cycled, it is normal for the home to gain a few degrees during the event. After the cycling period ends, your air conditioner may run continuously until your home reaches your thermostat temperature.

If you feel your air conditioner is not working properly, please call your local HVAC dealer. What if my heating and air conditioning company's service technician recommends that I have my switch disconnected or removed? Please have the service technician call 1-888-463-5022 before allowing them to proceed. I'm having a new air conditioner or heat pump installed in my house. After the installation is complete, please call 1-888-463-5022 and request to have the Power Manager device reconnected.  There is no charge for this service. I'm moving to a new house. Before you move, please call Duke Energy at 1-800-777-9898. We can arrange for a switch to be installed on the air conditioner at your new house. The toll-free number to enroll or ask questions is 1-888-463-5022.post #1 of 62 (permalink) ML320 AC Problem Compressor not Engaging - Mercedes-Benz Discussion Forum post #2 of 62 (permalink) post #3 of 62 (permalink) post #4 of 62 (permalink)

post #5 of 62 (permalink) post #6 of 62 (permalink) post #7 of 62 (permalink) f you are getting the 5 volt reference post #8 of 62 (permalink)Pressure Sensor 2002+.pdf (10.2 KB, 3411 views) post #9 of 62 (permalink) post #10 of 62 (permalink) - Mercedes-Benz Discussion ForumThis procedure will concentrate primarily on the operation and malfunctions of the late model 944 HVAC system (1985.5 and newer). That's primarily because the early HVAC system are of a much simpler design and is much less prone to malunctions. There's also not a great deal of information in print on the operation of the early HVAC systems. As more definitive information on the early 944 HVAC system becomes available, I'll be adding to this procedure. The early 944s have separate heating and A/C systems which provide air flow to a common mixing chamber. Each system has it's own housing and blower. Air flow through the system is contolled by flappers which are operated by cables.

The heater control valve is also controlled by a cable. So, when there's a problem with the system where there's no heat or excessive heat, it's normally due to a broken or disconnected cable. On the later model 944 HVAC systems, the A/C evaporator and heater core are contained in the same housing. Temperature control is automatic and is controlled by 3 temperature sensors. Once a temperature is selected it is maintained automatically by the temperature control unit repositioned dampers to control air flow through the unit. The temperature control unit determines how to position the dampers by comparing the signals from the three sensors. Once sensor senses outside air temperature. All air flow therefore passes through the A/C. From there it is either directed fhrough the heater core or bypassed the heater core (via a system of flappers) and into the cabin. Below are pictures of the late model 944 HVAC component locations. Full Heat at All Temperature Settings (Pre-1985.5 944s and All 924s)

On the early 944s pre-1985.5 full heat problems are somewhat unusual. However, when it happens, it is normally caused by the bowden cable for the heater unit damper coming loose. This will be much easier said than done but, you'll need to locate the bowden cables on the back of the heater controls on the center console and follow them until you locate the correct damper. There should be three cables. One for the heater unit damper, one for the AC unit damper, and one for the heater control valve (the heater control valve cable will go through the firewall). The damper for the heater unit is behind the center console. And, the AC unit damper is on the passenger's side of the vehicle. So, locate the cable for the heater unit damper and see if it is disconnected or broken. Full Heat at All Temperature Settings (1985.5 and Newer 944s) On late model 944s (1985.5 and newer), there are several problems that can cause the full heat condition. The first and most common problem is a damper linkage in the driver's side footwell (for left-hand drive cars).

Stick your head in the footwell and look up and toward the center console. You should see a small diameter metal rod which rests in a white plastic support and is held in place by a metal retaining clip. On later model 944s, there are two damper linkages instead of one and they are located behind a plastic cover. One of the plastic clips on the linkage may be broken preventing the linkage from operating the damper. When the damper fails to operate, the system fails to full heat. Most German cars are designed to fail this way. It's a safety feature to keep you from freezing in winter. The first picture below shows a linkage that has come loose from the support because the metal clip is broken. The second picture show the linkage properly in place with a new support and clip along with the part numbers for the support and clip. The second problem is with the heater control valve. The heater control valve is vacuum operated and located at the back of engine near the firewall. There is a vacuum line which goes from the valve to a vacuum connection at the firewall where the heater hose connections penetrate the firewall.

Check this vacuum line to make sure it is connected and doesn't show any signs of cracking. There is another vacuum line fitting near the heater hose connections which goes to a rubber "Y" connector. One side of the "Y" goes to a small check valve attached to the large brake booster vacuum line at the back of the firewall. The other side of the "Y" goes through the firewall to a plastic vacuum retention canister next to the battery. Make sure all these lines are connected and don't show any signs of cracking. If all vacuum lines are properly connected you may wish to remove the heater control valve from the system and check it's operation with a vacuum tester. A problem with the heater control valve opening may also be caused by the vacuum solenoid valve going bad. Remove the solenoid and apply 12 VDC to valve to see if it opens and closes properly. If you look at the picture titled HVAC UNIT RIGHT SIDE above, the solenoid is component #3. Finally, a full heat condition can be caused by a failure of the Temperature Control Unit (TCU) itself.