Operator, organizational, DS, and GS maintenance manual : air conditioner, compact, vertical, 208V, 3 phase, 18,000 BTUH cooling, 12,000 BTUH heating, (Trane models), 50/60 hertz model CE20VAL6, FSN 4120-973-4589, 400 hertz model CE20VAL4, FSN 4120-858-5795.

"November 1969."