Refrigerant Leaks - Emerson Liebert SRC18 User Manual

Troubleshooting
Table 10-2 Troubleshooting problems, causes and correction (continued)
Problem
The unit does not emit warm
air.
Depending on mode, some functions may not be supported.

10.6 Refrigerant Leaks

ASHRAE Standards 15-2010 and 34-2010 offer guidelines that address refrigerant safety and the
maximum allowable concentration of refrigerant in an occupied space. Refrigerant will dissipate into the
atmosphere, but a certain volume of air is required for this to occur safely. For R410A refrigerant, the
maximum allowable concentration is 0.026 lbs/ft
24-hour occupancy allow half of that concentration.
ASHRAE Standards 15 and 34 assume that if a system develops a leak, its entire refrigerant charge will
dump into the area where the leak occurs. To meet ASHRAE Standards 15 and 34, calculate the
refrigerant concentration that may occur in the smallest room volume on the system, and compare the
results to the maximum allowable concentration number.
refrigerant safety.
CAUTION
!
Risk of exposure to excessive refrigerant concentration and oxygen depletion. Can cause illness
or injury. If the unit is installed in a small improperly or non-ventilated space, take measures to
prevent the refrigerant concentration from exceeding safety limits in the event of a refrigerant leak.
Verify the maximum refrigerant concentration level in the space where the indoor unit will be
mounted meets the concentration limit for the application.
NOTE
Take appropriate actions at the end of HVAC equipment life to recover,
recycle, reclaim or destroy R410A refrigerant according to applicable US EPA
rules.
To calculate the potential refrigerant concentration level (RCL):
1. Measure the occupied space dimensions (in feet).
2. Calculate the cubic foot volume of air in the smallest occupied space. (To obtain a detailed overview of
the RCL, perform the same calculations to the second smallest zone, the third smallest zone until the
RCL is obtained for all zones. Also, pay special attention to areas such as basements, etc., where
refrigerant cannot dissipate easily.)
3. Divide the refrigerant change of the Liebert SRC serving the area in pounds by the results of Step 1.
® ™
Liebert SRC User Manual
Possible Causes
When Heating Mode starts, the vane is almost
closed and no air comes out, even thought the
outdoor unit is operating.
The outdoor unit is in Defrosting Mode.
Outside temperature is too low.
• This is normal. Please wait until the unit has
generated enough warm air to blow through
the indoor unit.
• In Heating Mode, ice/frost builds up on the
coils when the outside temperature falls.
This function removes the layer of frost on
the coil and should finish in approximately
15 minutes.
• The heating effect may not be sufficient.
3 3
per 1,000 ft of air in an occupied space. Buildings with
1
1
Also consult state and local codes with regard to
110
Corrective Action