ESIE09-08A External Backup Heater Kit
Appendix 267
6.8 Switch Box Layout
EKBUHAA6V3
Legend
S1L
Q1L
F1T
F1U
E1H + E2H
Q2L
K1M
K1A
K2M
K5M
F1B F2B
X1M
X2M
K6M
Part number Description
E1H, E2H Backup heater elements
F1B, F2B Fuse backup heater (20A 400V)
F1U Fuse (5A T 250V)
F1T Thermal fuse backup heater
K1A Time relay (on-delay)
K1M, K2M Contactor backup heater step
K5M, K6M Contactor for backup heater (all pole disconnection)
S1L Flowswitch
Q1L Thermal protector backup heater (manual reset)
Q2L Thermal protector inlet water (automatic reset)
X1M, X2M Terminal strip
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