ECR International Utica Boilers UB90-50 Installation, Operation & Maintenance Manual page 43

9. Restore all gas appliances that may have been shut off
(while measuring boiler input rate) to normal operating
conditions.
I. Remove regulator cover screw on top of gas valve,
and insert an appropriate screwdriver into adjustment
screw.
II. Turn adjustment screw clockwise to increase input
rate, or counter clockwise to decrease input rate.
III. Replace cover screw, or cover hole temporarily with
your finger to check new manifold pressure setting. Do
not set manifold pressure lower than 2.0 inches w.c.
or higher than 3.0 inches w.c. when adjusting input
rate.
IV. Measure new input rate (cover screw must be
installed). Repeat steps I.-IV until the input rate is
within +/-2% of the nameplate input rating.
V. If the actual input rate can not be set to within 2%
of the correct input rating by adjusting manifold
pressure, a change in gas orifice size is required.
Consult the boiler manufacturer for information on
correct orifice sizing. The specific gravity (G) and the
higher heating value (HHV) of the local natural gas
must be obtained from the local gas utility in order to
determine the proper orifice size.
Set Thermostat To Desired Room Temperature
Observe several operating cycles to verify proper operation.
Review All Instructions
Review all instructions shipped with this boiler with owner
or maintenance person. Instructions must be affixed on or
adjacent to the boiler.
Complete and sign the "Installation and Check-Out
Certificate" on page 62
VERIFICATION PROCEDURE AND ADJUSTMENT
.
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P/N 240010135 Rev. D [04/15/2017]