ECR International Utica Boilers MAH-125 Installation, Operation And Maintenance Manual page 72

Important Safety Information ....................................................................................................3
Labor Saving Piping Manifolds / Near Boiler Piping Connections ................................................4
General Information - Hydronic Piping .......................................................................................6
General Information - Wiring......................................................................................................8
Piping and Wiring Diagrams
Piping Legend.......................................................................................................................9
125 Zone Circulator Pumps - Piping Diagram .............................................................. 10
125 W/ Indirect Zone Pumps, DHW Tank, Tank Sensor - Wiring Diagram .......................... 11
125 W/ Indirect Zone Pumps & DHW Tank, Tank T-Stat - Wiring Diagram ......................... 12
125 With Zone Valves - Piping Diagram ....................................................................... 13
125 With Zone Valves, DHW Tank, Tank Sensor - Wiring Diagram ................................... 14
125 Indirect Zone Valves, DHW Tank W/ Tank T-Stat - Wiring Diagram ............................ 15
165 With Zone Circulator Pumps - Piping Diagram ........................................................ 16
165 Indirect Zone Pumps, DHW Tank, Tank T-Stat - Wiring Diagram ................................ 17
165 With Zone Valves - Piping Diagram ....................................................................... 18
165 Indirect Zone Valves, DHW Tank, Tank T-Stat - Wiring Diagram ............................... 19
150 & 205 With Zone Circulator Pumps - Piping Diagram ........................................................ 20
150 & 205 With Zone Pumps - Wiring Diagram..................................................................... 21
150 & 205 With Zone Valves - Piping Diagram ...................................................................... 22
150 & 205 With Zone Valves - Wiring Diagram ..................................................................... 23
Low Mass Piping and Wiring
Low Mass - Piping Diagram .................................................................................................. 24
Low Mass - Wiring Diagram .................................................................................................. 25
Optional Equipment & Accessories
Outdoor Temperature Sensor................................................................................................26
Indirect Storage Tank Sensor & Thermostat ........................................................................... 27
Wiring Diagrams
125 - Heat Only Wiring Diagram ........................................................................................... 29
165 - Heat Only Wiring Diagram ........................................................................................... 30
150 - Combi Wiring Diagram ............................................................................................... 31
205 - Combi Wiring Diagram ............................................................................................... 32
Altitude Effects On Boiler Performance ..................................................................................... 33
Application Table - Indirect Tank Sizing.................................................................................... 34
Low Water Cutoff Application ................................................................................................... 35
Error Code Table ....................................................................................................................... 38
Troubleshooting Chart .............................................................................................................. 39
Fault Solution Sections
TABLE OF CONTENTS
.......................................................................................................... 41
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PN 240011430 REV. M [06/30/2019]