Make-Up Air Installation Manual

01/17/2013 EI902
6
Summer Operation
Provisions will need to be made to make sure these elements cannot come on (interrupting Y input) during
cooling season.
Sequence
A. Contact applied to “Y” and “R” terminals.
B. Stage 1 (5KW) turns on for at least 10 seconds.
C. Based upon temperature at the duct sensor, the electric elements begin modulating or remain full on if
temperature is 3° below set point.
D. As the temperature rises, the Stage 1 (5KW) begins modulating (full on and then full off during a 10-second
interval).
E. If temperature does not reach set point, Stage 2 and/or Stage 3 comes on (Approximate 3 min. spacing).
F. If the warm air temperature goes 3° above set point, Stage 3 and/or Stage 2 again turn off.
G. Stage 1 will modulate ±2° around the set point.
H. With the absence of the “Y” and “R” contact, all elements are off.
I. At the next “Y” to “R” contact closure, the modulation rate and stage 2 or 3 activity returns to the same state.