2
These instructions
must be affixed on or
adjacent to the boiler.
UB90-50-100 GAS-FIRED BOILER
Model No.
UB90-50
UB90-75
UB90-100
Improper installation, adjustment, alteration, service,
or maintenance can cause injury or property damage.
Refer to this manual. For assistance or additional in-
formation consult a qualified installer, service agency,
or the gas supplier.
Read all instructions carefully before starting the
installation.
Save this manual for reference.
WARNING
!
CAUTION
!
Summary of Contents for UB90-100
Page 15: ...15 Near Boiler Piping Figure 2 Single Zone Boiler Piping ...
Page 16: ...16 Figure 3 Multi zone Boiler Piping With Zone Valves Near Boiler Piping ...
Page 19: ...19 Figure 6 Diaphragm Type Expansion Tank Piping Near Boiler Piping ...
Page 20: ...20 Figure 7 Conventional closed type Expansion Tank Piping Near Boiler Piping ...
Page 27: ...27 Combustion Air and Vent Pipe Figure 11 Combustion Air and Vent Piping ...
Page 32: ...32 Electrical Wiring Figure 13 Field Wiring Connections ...
Page 53: ...53 DETAILED SEQUENCE OF OPERATION ...
Page 57: ...57 TROUBLESHOOTING CHART 2 TROUBLESHOOTING ...
Page 58: ...58 TROUBLESHOOTING CHART 3 TROUBLESHOOTING ...