Carlin EZ-Temp 90524A - Manual (Page 4)

Model 90524A Triple limit or cold-start control — Instructions
Carlin part number MN90524AM Rev. 01/19/09 – 4 –
Where appliance instructions differ from this manual, follow the appliance instructions.
Equivalent circuit diagram — Figure 3 Triple limit operation (LOW LIMIT on)
Triple limit operation — Setup & adjustment
Set low limit setpoint on front of control (item 9, page 2). Set low limit differential •
at the adjustment potentiometer on the back of the control (item 7, page 2). The
differential range is shown on the control label. Rotate the potentiometer fully
counterclockwise for minimum setting, fully clockwise for maximum setting.
Set high limit setpoint on front of control (item 10, page 2). High limit differential
•
is fixed.
Triple limit sequence of operation
[ Burner turns ON when sensor temp is below the high limit (minus
high limit differential) — AND — sensor temp is below low limit
setting (minus low limit differential) OR there is a call for heat at
T-T or ZR.
[ Burner turns OFF when sensor temp is above high limit setting —
OR — when sensor temp is above the low limit AND there is no
call for heat at T-T or ZR.
[ Circulator turns ON when sensor temp is at or above low limit —
AND — there is a call for heat at T-T.
[ Circulator turns OFF when the sensor temp goes below the low
limit setting (minus the low limit differential) — OR — there is no
call for heat at T-T.
[ [ Zone feed (terminal ZC) turns ON when sensor temp is at or above
the low limit.
[ [ Zone feed (terminal ZC) turn OFF when sensor temp goes below
the low limit setting (minus the low limit differential).
Equivalent circuit diagram — Figure 4 Cold-start operation (LOW LIMIT set to OFF)
Cold-start operation — Setup & adjustment
Set low limit adjust on front of control to OFF (item 9, page 2). This activates the •
low temp setting. Low temp and its differential are fixed settings.
Set high limit setpoint on front of control (item 10, page 2). Set high limit differential
•
at the adjustment potentiometer on back of the control (item 7, page 2).
Cold start sequence of operation
[ Burner turns ON when sensor temp is below the high limit (minus
high limit differential) — AND — there is a call for heat at T-T or
ZR.
[ Burner turns OFF when sensor temp is above high limit setting —
OR — there is no call for heat at T-T or ZR.
[ Circulator turns ON when sensor temp is at or above low temp —
AND — there is a call for heat at T-T.
[ Circulator turns OFF when the sensor temp goes below the low
temp setting (minus the low temp differential) — OR — there is
no call for heat at T-T.
[ [ Zone feed (terminal ZC) turns ON when sensor temp is at or above
the low temp.
[ [ Zone feed (terminal ZC) turn OFF when sensor temp goes below
the low temp setting (minus the low temp differential).