Page 70
A2 diagram
with B2 diagram
ECH16-82/95/135/160 20kW & 30kW 208/230V Sequence
Operation Sequence: A2 Section and B2 Sections
(20/30kW 208/230V electric heat wired to CHA16-1603)
1- 1st stage heating demand closes W1. W1 passes through primary limits S15 to energize
contactor K15, relay K9 and time delay DL2. K151 contacts close and K91 and K92 both
switch.
2- When K151 closes, heating elements HE1 are energized. The elements are arranged in a Del
ta" configuration for 208/230V operation.
3- When K91 switches, indoor blower contactor K3 is energized. When K92 switches, time delay
DL2 is enabled (circuit is closed to W2).
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 passes through K92 to energize time delay DL2.
6- DL2 closes after 30 seconds. Contactor K16 is energized.
7- When K161 closes, heating elements HE2 are energized.
To Next Page
Loading...
Need help?
General
