Viking DFUW244CL, Service Manual

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3.13 Charging the System
1) Check to make sure that the hand shut-off valve to vacuum pump is closed.
2) Close the high side manifold gauge valve.
3) If using a Dial-A-Charge, set the charging cylinder scale to the pressure indicated on the pres-
sure gauge.
4) Observe the refrigerant level in the sight glass of the Dial-A-Charge, the a-joining scale indicates
the amount of charge in the cylinder. Subtract the amount of charge needed (per the serial
plate) from the amount of charge on the cylinder scale. See Below Example
5) Open the charging cylinder valve slowly and watch the sight glass on the Dial-A-Charge.
6) When the charge is reduced to the calculated level on the Dial-A-Charge scale, the correct
amount of charge is in the system.
7) Close charging valve on Dial-A-Charge.
8) Turn on unit and let compressor run for a few minutes.
9) Monitor system pressures and the temperature of lines with your hand.
10) If everything is satisfactory, clamp off the high side process tube when the unit is running.
11) Slowly open the high side valve and allow the compressor to remove any refrigerant remaining
in the high side line.
12)
Close both manifold gauges.
13) Remove the high side process adaptor and solder tube shut.
14) Clamp the low side process tube, remove adaptor, and solder tube shut.
15) Check for leaks.
BEFORE CHARGING ALWAYS VERIFY
THE AMOUNT OF CHARGE PRINTED
ON THE SERIAL PLATE
Example:
1) Dial-A-Charge liquid level is 15 ounces.
2) Viking Dual Zone requires 3.25 ounces of charge.
3) 15 oz - 3.25 oz = 11.75 oz.
4) 11.75 ounces will be the liquid level on the Dial-
A-Charge when the Dual Zone has obtained its
proper charge.
20
2010 - Viking Preferred Service SMR-0005