Heat Controller CDG SERIES Manuel D’Utilisation

Heat Controller, Inc. 

INSTALLATION INSTRUCTIONS 

Cased/Uncased Coils

10

To prevent refrigerant leak, use proper tools to ensure clean, burr-free cut.

Use brazing shield when welding close to the cabinet surface and wet rag to protect rubber grommet.

Brazing alloy should be at least 5% silver content.

In most applications, there is no need to change the piston (orifice). However, in some applications, 

changing the piston size is required. If the application requires a different piston/flowrator, change the 

piston in the distributor of indoor coil before installing the coil. See Table 1 for orifice size.

1.  Remove cover panel.
2.  Use Two wrenches.

     Loosen one turn to release pressure. (High pressure gas)
3.  After releasing pressure.

     Loosen and carefully pull  a part the two fittings to expose piston.
4.  Remove factory installed piston and replace with recommended piston from Table 1 as shown in Fig.7.
5.  Carefully reassemble assembly. (Hand tighten)

     Be sure to use teflon tape on thread for a complete seal.
6.  Hand tighten and make sure assembly is properly connected and then torque to 10-30 ft/lb.

NOTE: Be careful not to bend tubing

NUT

(MOMENT:15±2N.m)

PISTON

LIQUID LINE

Fig. 7: Flowrator Piston Change