Final Leak Testing - Daikin RCS Series Installation And Maintenance Manual

17 . Adjust refrigerant charge to obtain pressures indicated
in the temperature/pressure
page 21 .
18 . Note weight of refrigerant tank.
19 . When system has stabilized, check superheat at the
suction line service valve. The actual line temperature
should be 8° to 20°F higher than the saturation
temperature corresponding to the vapor pressure.
If superheat is measured at evaporator, the actual
line temperature should be 6° to 10° higher than the
saturation temperature corresponding to the vapor
pressure .
20 . Close service ports on vapor and liquid valves. Remove
service gauges.
Table 14: Charging Hints
Symptom
High head pressure
Low head pressure
Low vapor & hot compressor
Excessive sweating
Table 15: Pre-Start Check
1 Is the condensing unit properly located and level?
2 Is there free air movement to and from the condensing unit?
3
Is the wiring connected according to the unit wiring diagram?
4 Are the wiring connections tight (including those in the unit and compressor electrical box)?
5 Is the unit properly grounded?
6
Is the circulating air blower correctly wired?
7 Is the condensing unit properly fused?
8 Is the thermostat level, correctly wired and in a good location?
9
Is the ductwork correctly sized, run, taped and insulated?
10 Is the refrigerant tubing neatly run and the vapor line thoroughly insulated?
11 Is the condensate drain properly sized, run, trapped and pitched?
12 Are the refrigerant connections tight and leak tested?
13 Are the filters clean and in place?
14
Does the condenser fan turn freely without rubbing?
15 Is the fan blade tight on the fan shaft?
16 Areall covers and access panels in place to prevent air loss?
IM 962-4 • AIR-COOLED SPLIT SYSTEM CONDENSERS
Charging Charts starting on
Possible Cause
Air flow to/from condenser restricted or dirty condenser
Faulty condenser fan or motor
Overcharge of refrigerant
Air in system
Short of refrigerant
Low evaporator air flow
Short of refrigerant
Low indoor airflow
Excess refrigerant
21 . Replace service port caps and valve stem caps. These
caps must be replaced to prevent leaks.
22 . Record total charge quantity on rating plate.

Final Leak Testing

After the unit has been properly evacuated and charged, a
halogen leak detector should be used to detect leaks in the
system. All piping within the condensing unit, evaporator, and
interconnecting tubing should be checked for leaks. If a leak is
detected, the refrigerant should be recovered before repairing
a the leak. The Clean Air Act prohibits releasing refrigerant into
the atmosphere .
Remedy
Remove obstruction, relocate condensing unit,
if necessary clean condenser
Replace
Reduce charge
Evacuate and recharge
Check for leak, add charge
Increase blower speed, check filters
Check for leak—add refrigerant
Increase speed of air handler blower or reduce restriction,
replace air filter
Slowly reduce charge
18
Installation
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