Sentry S-120 Installation And Operating Instructions Manual - page 16
NOTE-TO REMOVE BURNERS:
1. Disconnect pilot at pilot mount, or disconnect pilot gas
line at gas valve, before removing burners next to pilot.
2. Remove burner mounting clip.
3. Lift burner and slide burner away from orifice.
4. Clean and replace burners* and pilot. Adjust burners as
described on page 15.
*To clean burners run a clean flue brush up the tube until all foreign mat
ter is removed.
4. SAFETY CHECK FOR CONTROL SYSTEM
A. High limit control test: Set thermostat high enough for
boiler water temperature to reach high limit control set-
ting. When this temperature is reached, the high limit
switch should open, and the main gas valve should close
automatically. If the high limit does not operate to close
the main gas valve, the valve, the high limit or the wiring
is faulty. Repair or replace immediately.
B. Gas valve safety shutdown test:
For boilers equipped with Honeywell S8600 inter mittent
pilot system, with main burners firing, disconnect the
ignition cable from the S8600 IGNITOR BOX. The gas
valve should shut off the main burners.If the gas valve
fails to shut down main burners when the test is per-
formed, replace the gas valve.
C. Check for gas leaks from valve and gas piping to burners
and pilot. If leaks are found, repair or replace as required.
5. PROVIDING PROTECTION FROM FREEZING
A. Anti-freeze is sometimes used in hydronic heating
systems to protect against freeze-up in the event of
power failure or control shutdown when the building is
unoccupied. It should be recognized that unless the
building is kept above freezing temperature by some
means, the plumbing system is not protected.
Two types of anti-freeze may be used: ETHYLENE
GLYCOL has desirable properties, but is toxic. Its use
may be prohibited when system water/glycol solution is
in contact with a potable water vessel (as with a tankless
heater). PROPYLENE
GLYCOL is used in the quick-
freeze food industry; it is practically non-toxic. Its use
may be permitted when tankless heaters are used. When
anti-freeze must be used, inhibited pro pylene glycol is
recommended. Useful information on the characteristics,
mixing proportions, etc. of glycol in heating systems is
given in Technical Topics No. 2A, available from the
Hydronics Institute 34 Russo Place, Berkeley Heights,
NJ 07922. Consult glycol manufacturers for sources of
propylene glycol.
B. Water Treatment:
A good water treatment program will not only extend the
useful life of this boiler but it will also save much of the
time and expense of repairs made necessary by pre-
ventable occurrences.
A reputable water treatment company should be con-
sulted to evaluate and determine the best overall treat-
ment program for your boiler equipment.
6. KEEP THE BOILER AREA CLEAR AND FREE FROM
COMBUSTIBLE MATERIALS, GASOLINE, AND OTHER
FLAMMABLE VAPORS AND LIQUIDS.
F. WATER SYSTEM CHECK:
1. System to be full of water, and pressure to remain
stable at correct setting on gauge.
2. Air control system: noise and air binding in system
should be corrected.
3. Water lines: slightest leaks should be corrected.
4. Low water cutoff, for operation (see instructions fur-
nished with unit).
2. WATER LEVEL CHECK DURING HEATING SEASON
A. Check water pressure regularly and add water slowly
to system when needed. If much water is added, vent-
ing may be necessary.
B. Regular loss of water from water boiler system may
indicate either a system leak, or a faulty air control sys-
tem, or a faulty automatic fill valve, or a faulty relief
valve.
3. ANNUAL INSPECTION AND CLEANING
A. It is important that this boiler be inspected by a com-
petent serviceperson to help insure safe and reliable
operation.
B. Check for gas leaks from valve and gas piping to burn-
ers and pilot. If leaks are found, repair or replace as
required.
C. This inspection should include:
1. Controls check. See "Safety Check for Control
System" (Section 4) below.
2. Recheck of input gas rate to burners. See "Initial
Start" paragraph in "Operating instructions" section.
3. Re-adjusting for best flame characteristics of main
flame and pilot(s).
See "Initial Start" paragraph in "Operating Instruc -
tions" section and see "Burner Adjustment" section.
4. Burner and boiler flue passage cleanliness:
BURNER AND FLUE CLEANING (see figure 12). It is
suggested that paper be placed on burners to col-
lect any foreign material when cleaning flues.
a. Remove jacket top and flue cover.
b. Use wire brush to clean flueways.
c. Replace flue cover and re-seal with furnace
cement. Replace jacket top. Remove and dis-
pose of paper and accumulated material.
d. If burner surfaces are not clean, or if uneven
flame indicates plugged burner ports, remove
and clean burners.
Sentry
16
WARNING:
The ceramic combustion chamber in the burner box
contains crystalline silica.
Wear proper dust mask and gloves when servicing
combustion chamber or burners.
Crystalline Silica has been identified as a carcinogen or
possibly carcinogenic to humans.