UTICA BOILERS UB90125 Installation, Operation And Maintanance Manual page 27

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 ig-
niter warm-up period), lamp D illuminates, indicat-
ing 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 instructions 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 control
below actual boiler water temperature. Burner should
go off while circulator continues to operate. Raise lim-
it setting above boiler water temperature and burner
should reignite after pre purge and igniter warm-up
period. Set the high limit control to the design temper-
ature requirements of the system. Maximum high limit
setting is 200°F. Minimum high limit setting is 100°F.
Return high limit differential 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 manufac-
turer. Burner should be operating and should go off
when controls are tested. When safety controls are
restored, burner should reignite.
Xiii. cHecKoUt ProceDUre & aDjUstMeNts
sEt tHERMostat HEat antIcIpatoR (if used)
and VERIFY tHERMostat opERatIon
For a single thermostat connected to the yellow ther-
mostat 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 instruc-
tions provided by the thermostat manufacturer re-
garding 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 efficient
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 deter-
mine the correct approximate input rate for the lo-
cal elevation.
3. Obtain the yearly average heating value of the local
gas utility. At sea level elevation, it should be ap-
proximately 1000 BTU per standard cubic foot.
4. Operate boiler for 5 minutes.
5. Turn off all other gas appliances, extinguishing
standing pilots where applicable.
6. At the gas meter, measure the time in seconds re-
quired to use one cubic foot of gas.
7. Calculate the "input rate" according to the following
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 "Ad-
justments and Checkout" on next page.
27
time in seconds From step 6