Figure 5-7. Check Valve
(1) Place check valve in the unit.
(2) Wrap wet rags around valve near connection points.
Direct flame away from the check valve.
(3) Purge system with nitrogen and braze the tubing joints. See para 5-6 and 5-7.
(6) Evacuate and charge the system. See para 5-9 and 5-10.
(7) Install both front door assemblies. See para 4-17.