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EVALUATING SYSTEM CHARGE:
1) Always allow any system heating or cooling to reach Steady State Operation (SSO) before taking temperature or amperage readings.
2) Donít waste time waiting for a system to reach SSO. Use the time to complete paperwork or complete the client and system information on the worksheet header.
3) Always set the thermostat 20 to 30 degrees above or below the indoor temperature to avoid the frustration of a system shutting off before you finish collecting all readings.
4) Donít attempt to use the program when it is raining outside, or the condenser is wet, or the outdoor ambient is below 68 degrees F Ö or in any other condition in which it would also be unreasonable to properly charge a system using the subcooling method.
5) By ďambient temperatureĒ: we mean outdoor ambient temperature.
6) When taking outdoor ambient temperatures avoid direct sun light (radiant heat) or other heat sources.
7) Take return air WB and DB readings at the return air grill (and not inside the plenum at the air handler/furnace. All WB readings should be to the nearest tenth (56.8) of a degree. Collecting this reading at the return air grill is easier, and by utilizing this practice.
8) Take supply air WB and DB readings at the register nearest the air handler/furnace. Readings taken inside the plenum, too close to the air handler/furnace, may result in distortions caused by unmixed air conditions and/or the radiant heat effects of elements and heat exchangers. All WB readings should be to the nearest tenth (56.8) of a degree.
9) Always record the lowest WB and highest DB reading at the supply register. Some registers may show different temperatures across the register face due to common air vortex effects. All WB readings should be to the nearest tenth (56.8) of a degree.
10) When in doubt, itís quicker and easier to double check your temperature readings than it is to put on a set of refrigerant gauges.
11) Take all WB and DB readings with same meter. Using two meters (one for return and another for supply) increases the potential for a skewed report due to differences in the two meters calibrations. If a single meter is slightly out of calibration Ö it is at least Ö always calibrated with itself. All WB readings should be to the nearest tenth (56.8) of a degree.
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