Calculating Refrigerant And Oil Charge; Oil Charge Determination; Setting Condenser Fan Controls - Conair EP2 series User Manual

Calculating Refrigerant and Oil Charge

To determine the approximate charge, first refer to
Table 12 and establish the required charge for the
condenser and chiller. Then refer to Table 13 to
determine the charge required for the field-installed
piping per circuit. The approximate charge per circuit
is therefore the sum of the values from Table 12 and
Table 13.
Table 5 – Chiller & Condenser Refrigerant Charge
Total Combined Chiller and Condenser
Circuit Capacity
Summertime Refrigerant Charge (lbs of
(tons)
5
7.5
10
15
20
25
30
35
40
Table 6 - Field Piping R-410A Refrigerant Charges
Lbs of R410A per 100 Foot of Line Length
Line Size OD
(inches)
Discharge Line
3/8
1/2
5/8
3/4
7/8
1 1/8
1 3/8
1 5/8
2 1/8
2 5/8

Oil Charge Determination

The chiller is factory charged with the amount of oil
required by the chiller only and not the total system.
The amount of oil required is dependent upon the
amount of refrigerant added to the system for the
field-installed piping. Use the following to determine
the amount of oil needed for the system.
Pints of Oil = Pounds of refrigerant in system / 100
R410A)
7.6
11.1
15.3
22.2
30.2
37.2
44.3
51.9
59.4
Liquid Line
0.4 3.7
0.7 6.8
1.1 11
1.6 16.4
2.2 22.8
3.6 36.7
5.6 57.4
7.9 81.2
13.9 142.1
21.4 219.5
Oil level should be checked after the chiller has run
for 15 minutes.

Setting Condenser Fan Controls

Depending on the number of condenser fans
present there will be different fan cycling pressure
control setting requirements. It is important that
these settings be correct in order to maintain proper
capacity control and operation of the system. Each
refrigerant circuit has a separate head-pressure
control circuit. Refer to Table 7 for the proper
pressure settings.
Table 7 - Condenser Fan Pressure Settings (psig)
Stage
Setting
Number
Max Speed
Stage 1
Min Speed
Fan On
Stage 2
Fan Off
Fan On
Stage 3
Fan Off
Fan On
Stage 4
Fan Off
To do this, open the remote condenser control
panel, remove the cover from the pressure control
module, and make sure everything is set as shown
below.
11
Number of Fan Stages
1 2 3
410 410 410
320 320 320
400 400
340 340
435
375
4
410
320
370
305
385
325
400
340