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BTH ULTRA Electric Boilers Installation & Operation manual (Revision: June 2015) 27.
Temperature and
Pressure Indicator
ZMC300-75P160CN
Transformer 208/240V x
24Vac
ZEL400-20842450 (50VA)
Fuse
ZEL250-TDMIDJ5
UltraSmart Controller
ZEL100-ULTRA
Power relay 24Vac
ZEL100-24ACNO30
Pressure relief valve
ZMC200-SV30PSI1
4 poles Contactor 24Vac
ZEL100-4P50A24
Surface High-Limit
manual reset switch
(USA Models only)
ZEL200-DISC227
High-Limit automatic
reset Switch
ZEL200-L6C732
Heating elements**
3kW : ZEL300-240V3KW
4.5kW : ZEL300-240V45KW
5kW : ZEL300-240V5KW
6kW : ZEL300-240V6KW
Figure 20 : Spare parts (front, 27-29 KW)
Figure 21 : Spare parts (top, 27-36 KW)
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