WeatherMaster® Water-Control Induction Air Terminal: 36R Unit Maintenance

Lint Screen (Accessory)

• Remove from panel and clean screen with soft brush or vacuum.

• Schedule cleaning as job conditions dictate.

Foreign Objects in Unit

• Vacuum unit to remove debris dropped thru discharge grille.

Contol Air Filter Removal (Fig.7)

• Disconnect control tubing from restrictor ports.

• Swing filter bracket away from filter box; pull filter assembly from unit end panel.

• Remove filter cover for access to filter media.

Changeover Valve Removal (Fig. 7 and 8)

• Remove coil end cover; disconnect control tubing from valve ports.

• If a pre-1973 changeover valve is to be removed, remove screw fastening valve to coil.

• Remove valve and replace with one as shown in Fig. 7 and 8.

• To remove changeover valve (as shown in Fig. 7 and 8), loosen spring clip, replace with new one and attach to coil as before.

Coil Removal (Fig. 7)

• Shut off water to and from unit; disconnect lines to and from coil.

• Remove oil end cover; remove changeover valve if used.

• Remove 2 sheet metal screws fastening condensate pan strip to unit.

• Remove 4 sheet metal screws fastening coil to unit; remove coil.

Bypass Damper Removal

• Remove screws holding unit panel; tilt panel forward from top, pivoting on top edge of coil (Fig. 6). Pull tape from top of damper spring; remove from panel.

Bypass Damper Removal

• Remove 4 screws fastening bottom rear panel to unit.

• At left end of unit (end opposite control tubing), remove wing nut fastening bellows assembly to unit; left this end of assembly from screw.

• Spread left side panel slightly to disengage bearing; then disengage bearing on opposite end.

• Slide damper assembly diagonally out thru front of unit above coil.

• Reinstall in reverse.

Bellows Assembly Removal (Fig. 9)

• Disconnect control tubing from inside port of restrictor tee. Pull free end thru opening inside panel.

• Remove wing nuts fastening bellows assembly to unit.

• Lift bellows assembly from screws; lower to floor level and slide out beneath unit.

• Note: if lack of clearance prevents this method of removal, remove thru front of unit above coil. (See steps 1-5 of Bypass Damper removal.)

• Reinstall in reverse.

Unit-Mounted Thermostat (Fig.7)

• Disconnect thermostat control tube(s) at restrictor tee or changeover valve

• Remove 2 screws holding aspirator box to thermostat assembly.

• Lift aspirator and thermostat assembly from unit.

• Remove sampling tube from thermostat assembly (sampling tube has left-handed threads.)

• Remove filter bracket from thermostat assembly.

• Reinstall in reverse.

Wall-Mounted Thermostat (Fig. 10)

• Remove thermostat cover plate and control knob; remove 2 screws fastening thermostat to box.

• Pull thermostat from box far enough to remove control tubing from ports; remove thermostat from box.

• Reinstall in reverse.