Black Box CRDX-G-FS-24KW, CRDX-W-FS-12KW Estimating Refrigerant Charge, Installation, Page

Chapter 2: Installation

CAUTION

POE oil is used in systems with R410A refrigerant. POE oil quickly absorbs moisture when exposed to air. High POE oil moisture levels react with refrigerant to form acid, which results in system contamination. Keep the entire system sealed as much as possible and minimize exposure of POE oil to outside air. R410A operates at high pressures, which must be considered when checking the operating temperatures/pressures while charging or troubleshooting the system. Tables are provided in Section 2.10.3 showing the temperature/pressure characteristics for R410A.

2.10.2.1 Estimating Refrigerant Charge

When charging a system with R410A refrigerant, you must weigh the refrigerant and confirm the charge is correct by checking the superheat and subcooling temperatures (see Section 2.10.2.3).

You can estimate the amount of refrigerant needed by adding the amount of refrigerant required for the A/C unit (Table 2-8) plus the condenser (Table 2-9) plus the interconnecting refrigerant piping between the A/C unit and the condenser (Table 2-10). The values in the tables are the estimated weights for the refrigerant circuit. Table 2-9 shows the estimated charge weights for Black Box condensers. Depending upon site-specific conditions, refrigerant may need to be added or removed when fine tuning the charge to obtain the correct superheat and subcooling temperatures.

Table 2-8. Estimated refrigerant charge weight for A/C unit.

A/C Unit Model Number	Approximate R410A Charge
CRDX-A-FS-12KW	3.9 lb.
CRDX-A-FS-24KW	5.2 lb.

Table 2-9. Estimated refrigerant charge weight for condensers.

Condenser Model # R410A Charge (less receiver)		R410A Charge (with receiver)
BB-060-SEC,	2.8 lb.	12.2 lb.
BB-060-SSA
BB-096-SEC,	3.6 lb.	15.7 lb.
BB-096-SSA
BB-120-SEC,	5.4 lb.	23.6 lb.
BB-120-SSA
BB-192-SEC,	8.2 lb.	35.9 lb.
BB-192-SSA

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