Johnson Controls 820900-UUM-A-1011 Characteristics Of Heat Pumps, End View Less Filter Access

820900-UUM-A-1011

(4)16" X 20"

FILTERS

	INDOOR COIL
	CONDENSATE
	DRAIN
(4) 16" X 25"	CONNECTION
FILTERS

15 TON

(6) 12" X 24"
FILTERS	INDOOR COIL

(6)12" X 24"

FILTERS

CONDENSATE

DRAIN

CONNECTION

20 TON

FIGURE 3 - END VIEW LESS FILTER ACCESS

PANEL 15 AND 20 TON

REGISTERS

Supply and return air registers must be open when the unit is in operation. Furniture must not block airflow in or out of the registers.

CONDENSER COIL

An annual check and cleaning of the outdoor coil should be done. Clean any debris and dirt from the out- side coil face with a brush being careful not to damage the fins. If extremely dirty, a hose can be used to wash the coil from the inside out while brushing a soapy solu- tion on the outside.

BLOWER ASSEMBLY

Even with good filters properly in place, blower wheels and motors will become dust laden after long months of

operation. The entire blower assembly should be inspected annually. If the motor and wheel are heavily coated with dust, they can be brushed and cleaned with a vacuum cleaner.

CHARACTERISTICS OF HEAT PUMPS

A CONSTANT HEAT

Heat pumps have a noticeably cooler supply air tem- perature than furnaces. The common practice of over- sizing furnaces contributes to an "off-and-on-again" operation with short blasts of hot supply air. The heat pump system is sized more closely to the heating needs of your home. Heat is supplied at a lower tem- perature over a longer period of time to provide a more constant heat, and it may give you the impression that your system "never stops running".

WATER RUN - OFF

During the heating cycle, you may notice water running off the outdoor coil. Moisture from the air is condensed on the outside surface of the coil where it gathers and runs off. No need for alarm, your unit has not sprung a leak!

OUTDOOR COIL DEFROSTING

At certain outdoor conditions (low temperature, high humidity), frost may build up on the coil of the outdoor unit. In order to maintain heating efficiency, the system will automatically defrost itself.

Water vapor rising from the outdoor unit is normal and is an indication of proper operation. The vapor cloud will only last for a few minutes. When the defrost cycle is completed, the system will automatically switch back to heating. Electric heat is automatically energized to maintain comfort during defrost.

BEFORE CALLING A SERVICE PERSON

•Check thermostat setting and insure thermostat is calling for heat or cooling. Check thermostat for lint, etc.

•Check fuses or circuit breakers

•Check filters for excessive dust accumulation

Johnson Controls Unitary Products 5