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A6 diagram with B2 diagram
ECH16-82/95/135/160 20kW & 30kW 460V & 575V
Operating Sequence
Operation Sequence: A6 Section and B2 Sections
(20/30kW 460V or 575V electric heat wired to CHA16-1603)
1- 1st stage heating demand closes W1. W1 passes through primary limits S15 to energize contac
tor K15 and relay K9. K151 contacts close and K91 switch.
2- When K151 closes, heating elements HE1 and HE2 are both energized. The elements are ar
ranged in a Wye" configuration for 460V or 575V operation.
3- When K91 switches, indoor blower contactor K3 is energized.
4- When K3 is energized, the indoor blower is powered (and optional economizer opens to mini
mum position when K32 contacts close).
5- Additional heating demand W2 is not used.
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