Table Of Contents; Introduction - ECR International Utica Boilers UB90-50 Installation, Operation & Maintenance Manual

Dimensions ....................................................................................................................2
Introduction ...................................................................................................................3
Important Safety Information ...........................................................................................4
Boiler Ratings & Capacities ..............................................................................................5
Boilers For Use At High Altitude - United States Installations ................................................ 6
Before Installing The Boiler ..............................................................................................8
Boiler Installation ...........................................................................................................9
Near Boiler Piping ......................................................................................................... 11
Combustion Air And Vent Pipe ........................................................................................ 22
Gas Supply Piping ......................................................................................................... 28
Electrical Wiring ........................................................................................................... 30
Controls And Accessories ............................................................................................... 34
Start Up ...................................................................................................................... 36
Operating Instructions ................................................................................................... 37
Detailed Sequence Of Operation ..................................................................................... 38
Verification Procedure And Adjustment ............................................................................ 42
Differential Air Pressure Switch Check - All Models ............................................................ 45
Negative Pressure Switch Check ..................................................................................... 46
Maintenance And Cleaning ............................................................................................. 47
Troubleshooting ............................................................................................................ 49
Troubleshooting - High Limit Control And LWCO ............................................................... 50
Troubleshooting - Hydrostat High Limit Control And LWCO.................................................. 51
Appendix A - Water Quality, Water Treatment And Freeze Protection ........................58
Installation And Check-Out Certificate ............................................................................. 62

Introduction

• This appliance is a gas-fired direct vent hot water boiler
with cast aluminum boiler sections.
• The heating system water absorbs large amounts of
heat from the cast aluminum heat exchanger, cooling
flue gases and causing condensation.
• Sealed combustion, premix gas burner, and low flame
temperature means reduced CO and NOx emissions,
which contribute to cleaner and healthier environment.
• This appliance takes its combustion air directly from
outdoors (sealed combustion) and does not compete
with building occupants for fresh air.
• Sealed combustion (also known as "direct vent")
is safest and best way to obtain plenty of clean
combustion air.
INTRODUCTION
• Induced draft fan draws in outside combustion
air, takes cooler flue gases from boiler unit and
provides positive removal of flue gases from the
building through readily available PVC, CPVC and PP
(Polypropylene) pipes.
• These low pressure gas-fired hot water boilers are
design certified by CSA International for use with
natural gas and propane gas.
• Boilers are constructed and hydrostatically tested for
maximum working pressure of 50 psig (pounds per
square inch gage) in accordance with A.S.M.E. Boiler
and Pressure Vessel Code Section IV Standards for
heating boilers.
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P/N 240010135 Rev. D [04/15/2017]