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Common Causes of Unsatisfactory Operation of Heat A heat pump operates by removing heat from the outdoor air Pumps on the Heating Cycle. and actually "pumping" it indoors via a refrigerant circuit. A. Dirty Filters or inadequate air volume through indoor coil. Obviously, the colder the outdoor air becomes, the more When the heat pump is on the heating cycle,the indoor difficult it is for the heat pump to remove heat from it, even coil is functioning as a condenser; therefore, the filters though it will remove heat from even the coldest of air. As it must always be clean, and sufficient air volume must becomes colder outdoors, the air from your registers will pass through the indoor coil to prevent excessive dis- gradually become less warm.Although this air may feel less charge pressure and high pressure cut-out. warm, it contains enough heat to warm your home except in the most extreme weather. B. Outside Air into Return Duct: Cold outside air should not be introduced in the return duct of a heat pump in- When the outdoor temperature drops to a point where the stallation on the heating cycle close enough to the in- heat pump alone cannot supply enough heat for your home, door coil to reduce temperature of the air entering the electric heaters are automatically brought on to supply the coil below 18.3°C.Air below this temperature will cause needed additional heat. At this time, your unit will operate low discharge pressure, thus low suction pressure and continuously.This is normal.During a severe cold spell,your excessive defrost cycling with resultant low heating out- heat pump may run continuously for several days. put. It may also cause false defrosting. To realize the economical operational benefits of your heat pump, the amount of time the electric heaters are in opera- C. Undercharge: Undercharge on the heating cycle will tion should be kept to a minimum. These heaters are con- cause low discharge pressure resulting in low suction trolled by the thermostat and come on at about two degrees pressure and frost accumulation on the lower part of below thermostat setting. Therefore, each time the thermo- the outdoor coil. stat setting is moved up two degrees, the heaters are D. Poor"Terminating"Defrost Thermostat contact. Defrost energized in addition to the heat pump. For economical thermostat must make good thermal contact on return operation, the thermostat should be set to the desired bend, otherwise it may not terminate the defrost cycle temperature and left there throughout the heating season. quickly enough to prevent unit from cutting out on high The practice of setting the thermostat back a few degrees at discharge pressure during the defrost cycle. night is not recommended as the heat pump will have to work harder in the morning and may take a relatively long time to E. Malfunctioning Reversing Valve: This may be due to: warm the house to the desired level. It is also uneconomical 1. Solenoid not energized. In order to determine if the sole- as the electric heaters would be energized. A heat pump is noid is energized, touch the nut that holds the solenoid most economical when maintaining a desired temperature. cover in place with a screwdriver. If the nut magnetically Under normal operation,the air delivered from your regis- holds the screwdriver in cooling,the solenoid is energized. ters may feel less warm than that supplied from a gas or 2. No voltage to solenoid:Check voltage. If no voltage,check oil fired furnace. This is also normal. The heat pump wiring circuit. supplies larger quantities of air at a lower temperature. This results in more uniform room temperature since the 3. Valve will not shift : heated air is closer to room temperature, eliminating hot a. Undercharged : (A) check for leaks; areas near the registers. The heated air will generally range in the area of 32.3° to 37.8°C, more than ample to b. Valve Body Damaged: Replace valve; heat your home. c. Unit Properly Charged: If it is on the heating cycle, It is important that large quantities of this air be delivered. raise discharge pressure by restricting air flow through Restricted air flow will result in high operating cost, poor the indoor coil. If the valve does not shift, tap it lightly heating and possible equipment malfunctions or damage. on both ends with screwdriver handle. Do Not Tap The Closed registers and dirty filters are the primary cause of Valve Body. If unit is on the cooling cycle, raise dis- restricted airflow.All registers,supply and return,should be charge pressure by restricting air flow through the out- open and not blocked by carpet orfurniture. Filters must be door coil. If the valve does not shift after the above at- inspected at least once each month and cleaned orchanged tempts, cut the unit off and wait until the discharge and if necessary. We hope you have found this information suction pressure equalize, and repeat above steps. If helpful.We also want to remind you that your closest and best the valve does not shift, replace it. source of information is your installing dealer.Be sure to have your installer go overyour system with you and show you filter DEAR HOMEOWNER: and fuse locations and answer any questions you may have. Your heat pump will provide you with years of year-round We strongly recommend a yearly inspection of your unit by comfort. The following paragraphs are our introduction to you a qualified service technician. Most dealers offer a mainte- on the operation of your new heating and air conditioning nance or service contract which includes this service. system. There are certain operational characteristics of a heat pump with which the homeowner should become famil- iar. 11 Downloaded from www.Manualslib.com manuals search enginc