RTAC-SVX01F-EN 47
Installation - Mechanical
Important
1. Additional glycol beyond the recommendations will adversely effect unit perfor-
mance. The unit efficiency will be reduced and the saturated evaporator tempera-
ture will be reduced. For some operating conditions this effect can be significant.
2. If additional glycol is used, then use the actual % glycol to establish the low
refrigerant cutout setpoint.
3. The minimum low refrigerant cutout setpoint allowed is -5 deg F. The minimum is
established by the solubility limits of the oil in the refrigerant.
Specials
The following constitute a special that must be calculated by engineering:
1. Freeze inhibitor other than Ethylene Glycol or Propylene Glycol.
2. Fluid delta T outside the range 4 to 16 deg F.
3. Unit configuration other than Standard, Standard with extra pass, and Premium.
4. % Glycol greater than maximum in column in Tabl e 10.
Special should all be calculated by engineering. The purpose of calculating is to make
sure that design saturation temperature is greater than 3 deg F. Additionally, the calcu-
lation must verify that the fluid freeze point is a minimum of 4 deg. F lower that the
design saturation temperature. The low evaporator temperature cutout will be 4 deg F
below the freeze point or -5 deg F, whichever is greater.