Page 71
A3 diagram
with B2 diagram
ECH16-82/95/135/160 40kW 208/230V Operating Sequence
Operation Sequence: A3 Section and B2 Sections
(40kW 208/230V electric heat wired to CHA16-1603)
1- Control voltage in this heater is supplied by a separate transformer T2 which is powered at all
times.
2- 1st stage heating demand closes W1. W1 energizes relay K9.
3- When K91 switches, indoor blower contactor K3 is energized. The indoor blower is powered (and
optional economizer opens to minimum position when K32 contacts close).When K92 closes,
second stage heat is enabled. When K93 closes, control voltage passes through primary limits
S15 to energize contactor K15.
4- When K151 closes, heating elements HE1 are energized. All elements are arranged in a Del
ta" configuration for 208/230V operation.
5- Additional heating demand W2 passes through K92 to energize relay K19.
6- When K191 switches, time delay DL2 is energized. DL2 closes 30 seconds later to energize con
tactor K16 and time delay DL4.
7- When K161 closes heating elements HE2 are energized,
8- DL4 closes after 30 seconds to energize contactor K17 is energized.
9- When K171 closes, heating elements HE3 are energized.
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