AUX EL Series Instructions d'exploitation télécharger pdf (Page 20)

09/11/2014 18 NI401

Preventive Maintenance

Air Filter Maintenance – The air filter in your Northern Heat Pump is designed for optimum performance and

long life. However, a dirty filter will result in lower efficiency and performance. Periodically, the filter should

be thoroughly pressure washed in the opposite direction of airflow. Under normal operating conditions, a

monthly cleaning should be satisfactory.

Water Coil Maintenance –In closed loop systems, water coil maintenance is generally not needed. However, if

a dirty installation or deterioration of the piping has caused debris to accumulate in the system, the water coil

should be cleaned using standard cleaning procedures. For open loop systems installed in areas with a high

mineral content, it is best to schedule regular periodic maintenance to inspect and clean the coil if necessary.

Should cleaning become necessary, do so using the following standard cleaning procedures:

Chlorine Cleaning (Bacterial Growth)

1. Turn thermostat to “Off” position.

2. Connect a circulating pump to hose bibs on entering water and leaving waterside of heat exchanger.

3. Using a five-gallon pail of water add chlorine bleach mixture. The chlorine should be strong enough to

kill the bacteria. Suggested initial mixture is 1 part chlorine bleach to 4 parts water.

4. Close shut off valves upstream and downstream of heat exchanger.

5. Open hose bibs to allow circulation of bleach solution.

6. Start pump and circulate solution through heat exchanger for 15 minutes to one hour. Solution should

change color to indicate the chlorine is killing the bacteria and removing it from the heat exchanger.

7. Flush used solution down the drain by adding fresh water supply. Flush until leaving water is clear.

8. Repeat procedure until solution runs clear through the chlorine circulation process.

9. Flush entire heat pump system with water. This procedure can be repeated annually, semiannually, or as

often as it takes to keep bacteria out of the heat exchanger, or when bacteria appears in a visual flow

meter to the point the flow cannot be read.

Muriatic Acid Cleaning (Difficult Scaling and Particle Buildup Problems)

- Consult installer due to dangerous nature of acids.

- Iron out solutions and de-scaling products are also useful.

Condensate Drip Pan and Drain –Inspection and cleaning of the condensate drain system during the cooling

season will help prevent the system from plugging up, potentially causing water damage to your structure and

floor coverings. Inspect the flexible “P-trap” to make certain it remains clear of obstructions. In some areas,

airborne bacteria can cause algae to grow in the drip pan. In these areas, it may be necessary to treat the drain

pan with an algae inhibiting chemical, as this algae together with lint and dust could plug the drain piping.

Blower Motors – All Northern Heat Pumps are equipped with factory sealed bearing blower motors. These

motors should never need additional lubrication for the life of the motor. Periodic maintenance oiling is not

recommended, as excess oil will attract lint and dust.

Air Coil – In order to keep your Northern Heat pump operation at peak efficiency, the air coil should be

inspected and cleaned when necessary. If the coil is excessively dirty, the coil can be cleaned with a household

vacuum cleaner and a soft brush. The aluminum fins are fragile and bend easily, so take great care not to

damage the fins, and remember, these fins are sharp, so take the needed safety precautions.

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AUX EL Series Instructions d'exploitation Page 20