22 18-BC90D1-4A-EN
STEP 3 - Check the liquid line temperature and
liquid gage pressure to obtain a minimum of 10º
subcooling in heating mode.
Measured Liquid Line Temp = __________ º F
Liquid Gage Pressure = __________ PSIG
STEP 4 - Add charge if a minimum of 10º
subcooling is not obtained with the nameplate
charge plus additional charge previously added.
STEP 5 - Return to site for adjustment.
Important: Return in the spring or summer to
accurately charge the system in the cooling
mode with outdoor ambient above 55º F.
20 MIN.
STEP 2 - Stabilize the system by operating for a
minimum of 20 minutes.
At startup, or whenever charge is removed or
added, the system must be operated for a mini-
mum of 20 minutes to stabilize before accurate
measurements can be made.
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