UTICA BOILERS UB90 125 Installation Manual And Operating Instructions page 24

INSPECT VENTING & AIR INTAKE SYSTEM
Operate the boiler and verify that all vent/air intake
connections are gastight and watertight. Repair
any leaks immediately.
INSPECT CONDENSATE DRAIN
Verify that all connections are watertight, and that con-
densate flows freely. Repair any leaks immediately.
INSPECT SYSTEM PIPING
Verify that all connections are watertight. Repair
any leaks immediately.
TEST IGNITION SYSTEM SAFETY SHUTOFF
1. Turn off manual gas shut off valve.
2. Set thermostat to call for heat.
3. Boiler begins normal sequence of operation.
4. After approximately 30 seconds (pre purge
and igniter warm-up period), lamp D illuminates,
indicating gas valve is powered.
5. After 4 seconds, gas valve closes, lamp D
goes out as integrated boiler control senses that
flame is not present.
6. To restart system, follow operating instruc-
tions in Section XII, "Start Up."
TEST AND ADJUST HIGH LIMIT CONTROL
Set high limit differential to minimum setting. While
burner is operating, adjust setting on high limit con-
trol below actual boiler water temperature. Burner
should go off while circulator continues to operate.
Raise limit setting above boiler water temperature
and burner should reignite after pre purge and ig-
niter warm-up period. Set the high limit control to
the design temperature requirements of the sys-
tem. Maximum high limit setting is 200°F. Minimum
high limit setting is 100°F. Return high limit differen-
tial to original setting (20°F)
TEST OTHER SAFETY CONTROLS
If the boiler is equipped with a low water cut off, a
manual reset high limit, or additional safety controls,
test for operation as outlined by the control manu-
facturer. Burner should be operating and should go
off when controls are tested. When safety controls
are restored, burner should reignite.
SET THERMOSTAT HEAT ANTICIPATOR
AND VERIFY THERMOSTAT OPERATION
For a single thermostat connected to the yellow
thermostat lead wires in the furnished field wiring
junction box, the heat anticipator should be set at
0.7 amps. For other wiring configurations, refer to
the instructions provided by the thermostat manu-
facturer regarding adjustment of heat anticipator.
Cycle boiler with thermostat. Raise the thermostat
to the highest setting and verify boiler goes through
normal start up cycle. Lower thermostat to lowest
setting and verify boiler goes off.
MEASURE NATURAL GAS INPUT RATE
Correct input rate is essential for proper and effi-
cient operation of the burner and boiler.
1. Determine the elevation at the installation
site.
2. See Table 2 in Section IV of this manual to
determine the correct approximate input rate for
the local elevation.
3. Obtain the yearly average heating value of the
local gas utility. At sea level elevation, it should be
approximately 1000 BTU per standard cubic foot.
4. Operate boiler for 5 minutes.
5. Turn off all other gas appliances, extinguish-
ing standing pilots where applicable.
6. At the gas meter, measure the time in sec-
onds required to use one cubic foot of gas.
7. Calculate the "input rate" according to the fol-
lowing formula:
Btuh input rate = 3600 x heating value from step 3
8. The measured input rate should be within +0/-
2% of the input rating found in step 2. If not, see
"Adjustments and Checkout" on next page.
24
(IF USED)
Time in seconds from step 6