Trane Custom Climate Changer Air Handlers manual Examples of Field-InstalledEvaporator Piping

Installation

•Frostat™ coil frost protection. The Frostat control is the preferred method for protecting evaporator coils from freezing when the refrigerant coil is used with Trane condensing units. It senses the suction-line temperature and temporarily disables mechanical cooling if it detects frost conditions. The control is mechanically attached to the outside of the refrigerant line, near the evaporator, and wired to the unit control panel.

•Ball shutoff valve. Adding manual, ball-type shutoff valves upstream and downstream of the filter simplifies replacement of the filter core.

Examples of Field-Installed Evaporator Piping

Single-Circuit Condensing Units: Evaporator Coil with One Distributor (see Figure 35)

1Pitch the liquid line slightly—

1 inch/10 feet [1 cm/3 m]—so that the refrigerant drains toward the evaporator.

2Provide one expansion valve per distributor.

3Slightly pitch the outlet line from the suction header toward the suction riser—that is, 1 inch/

10 feet [1 cm/3 m] in the direction of flow. Use the tube diameter that matches the suction-header connection.

4For the vertical riser, use the tube diameter recommended by the condensing unit manufacturer. Assure the top of the riser is higher than the evaporator coil.

5Arrange the suction line so the refrigerant gas leaving the coil flows downward, past the lowest suction-header outlet, before turning upward.

6Pitch the suction line slightly—

1 inch/10 feet [1 cm/3 m]—so the refrigerant drains toward the evaporator.

7Insulate the suction line.

Figure 35. Single-circuit evaporator coil with one distributor

CAH-SVX01A-EN 35