UTICA BOILERS UB90-50 Installation Manual page 4

G. Differential Pressure Air Proving Switch/Blocked Vent Safety Shutoff ................................................................................. 36
H. Draft Inducer ................................................................................................................................................................................ 37
I. Circulator Pump ............................................................................................................................................................................ 37
J. Drain Valve ..................................................................................................................................................................................... 37
K. A.S.M.E. Rated Pressure Relief Valve ........................................................................................................................................ 37
L. Blocked Vent Safety Shutoff ........................................................................................................................................................ 37
M. External Condensate Pump (Optional) ................................................................................................................................... 37
Water Treatment & Freeze Protection ............................................................................................................... 38
Piping Recommendations ................................................................................................................................................................ 38
Water Chemistry ................................................................................................................................................................................ 38
Cleaning the Hydronic System ........................................................................................................................................................ 39
Freeze Protection ............................................................................................................................................................................... 39
Start Up ................................................................................................................................................................. 40
A - Filling Boiler With Water And Purging Air For Systems With Diaphragm Type Expansion Tanks .............................. 40
B - Purging Air For Systems With Conventional Closed Type Expansion Tanks: ................................................................... 40
C - Placing Boiler In Operation ....................................................................................................................................................... 41
Check Out Procedure and Adjustment ............................................................................................................... 42
A. Verify Proper Sequence Of Operation ...................................................................................................................................... 42
B. Inspect Venting And Air Intake System ..................................................................................................................................... 43
C. Inspect Condensate Drain ........................................................................................................................................................... 43
D. Inspect System Piping .................................................................................................................................................................. 43
E. Test Ignition System Safety Shutoff Device ................................................................................................................................ 43
F. Test High Limit Control And Adjust .......................................................................................................................................... 44
G. Test Other Safety Controls .......................................................................................................................................................... 44
H. Set Thermostat Heat Anticipator (If Used) And Verify Thermostat Operation .................................................................. 44
I. Measure The Natural Gas Input Rate .......................................................................................................................................... 44
J. Set Thermostat To Desired Room Temperature ......................................................................................................................... 45
K. Review All Instructions ............................................................................................................................................................... 45
Maintanance And Cleaning ................................................................................................................................. 48
Beginning Of Each Heating Season ................................................................................................................................................ 48
Daily During Heating Season .......................................................................................................................................................... 48
Monthly During Heating Season ..................................................................................................................................................... 49
Periodically During Heating Season ............................................................................................................................................... 49
End Of Each Heating Season - Annual Shutdown Procedure ..................................................................................................... 49
Annual Examination And Cleaning Of Boiler Components....................................................................................................... 49
Detailed Sequence Of Operation ........................................................................................................................ 51
Troubleshooting .................................................................................................................................................. 54
Differential Air Pressure Switch Check ............................................................................................................... 62
Repair Parts .......................................................................................................................................................... 64
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