8 terms

Primary Controls

primary
STUDY
PLAY
600 to 1600 ohms
operating ohmmic value for cad cell
a cad cell is sensitive to
light
a cad cell primary control is 'fast' to respond to 'light' and will shutdown the burner in ______ sec.
whatever the manufacturer specifies
a stack relay is 'slow' to respond to 'heat' and therefore takes ------- to provide burner shutdown
120 sec.
high resistance
cad cell 'sees'' darkness
low resistance
cad cell 'sees' light
the cad cell primary control has ______ connections for the cad cell and _____ connections for the thermostat
2, 2
the cad cell terminal connections to the primary control are either
S and S or F and F
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