Installation Manual for the Ademco 669 and WS669, published in 1981. Document No: P4449V1, Rev: 8/81. Models 669 and WS669. Hardware installation, terminal connections, and environmental requirements.

Installation Manual for the Ademco 669 and WS669, published in 1981. Document No: P4449V1, Rev: 8/81. Models 669 and WS669. Hardware installation, terminal connections, and environmental requirements.