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STEP 9 - Record System Information for refer- <br /> ence. <br /> Record system pressures and temperatures <br /> after charging is complete. <br /> Outdoor model number= Measured Suction Line Temp = ° F <br /> Measured Outdoor Ambient= ° F Liquid Gage Pressure = PSIG <br /> Measured Indoor Ambient= ° F Suction Gage Pressure = PSIG <br /> Measured Liquid Line Temp = ° F <br /> 14.3 Subcooling Charging Below 550 F Outdoor Temp. (In Heating Only) <br /> The Subcooling Charging method in cooling is <br /> not recommended below 55° F outdoor tem- <br /> perature. <br /> The only recommended method of charging at <br /> outdoor temperatures below 55° F is weighing <br /> in the charge in heating mode. <br /> STEP 1 - Determine additional charge. <br /> Note:The nameplate charge value represents Weigh-In Method can be used for the initial <br /> the amount of refrigerant shipped in the outdoor installation, or anytime a system charge is being <br /> unit and is compatible with 10 feet of AHRI rated replaced.Weigh-In Method can also be used <br /> refrigerant lines and the smallest AHRI rated when power is not available to the equipment <br /> coil. site or operating conditions (indoor/outdoor <br /> temperatures) are not in range to verify with the <br /> Using the method below, find the charge associ- subcooling charging method. <br /> ated with the additional length of tubing above <br /> 10 ft.and record it below. <br /> Calculating Charge Using the Weigh-In Method <br /> STEP 1 - Measure in feet the distance between the 1. Total Line length (ft) —10 ft <br /> outdoor unit and the indoor unit. (Include the entire <br /> length of the line from the service valve to the IDU.) 2. Charge multiplier x 0.6 oz <br /> Subtract 10 ft from this entire length and record on <br /> line 1. 3. Step 1 x Step 2 = <br /> STEP 2- Enter the charge multiplier (0.6 oz/ft). 4. Refrigerant (oz) _ <br /> Each linear foot of interconnecting tubing requires <br /> the addition of 0.6 oz of refrigerant. <br /> STEP 3- Multiply the total length of refrigerant tub- <br /> ing (Line 1)times the value on Step 2. Record the <br /> result on Line 3 of the Worksheet. <br /> STEP 4-This is the amount of refrigerant to weigh- <br /> in prior to opening the service valves. <br /> 18-BC108D1-1 B-EN 21 <br />