Inspect Refrigerant Float System - Carrier 19DV Series Installation, Operation And Maintenance Instructions

Fig 57 – Refrigerant pump assembly

9.3.8 Inspect Refrigerant Float System

For 19DV unit, the condenser has a high side ball type float system, and the economizer has a low side ball type
float system. This applies for both the high side float (first float downstream of condenser) and the low side float
(second float downstream of condenser). The float refrigerant level can be observed through the sight glasses
located on the float chamber. Perform the inspection every five years or if the following symptoms are seen.
• There is a simultaneous drop in cooler pressure and increase in condenser pressure. This will be accompanied
by a loss of EER.
• The liquid line downstream of the float valve feels warm and float valve seems stuck based on a visual inspection
through the end cover sight glass. This indicates condenser gas flowing past the float.
1. Transfer the refrigerant into a pumpout storage tank.
2. Remove the float access cover.
3. Clean the chamber and valve assembly thoroughly. Be sure the valve moves freely. Ensure that all openings
are free of obstructions.
4. Examine the cover gasket and replace if necessary.
See Fig. 58 for float detail. Inspect the float every five years. Clean the chamber and the float valve assembly. Be
sure that the float moves freely and the ball bearings that the float moves on are clean.
103