C. Main Burner Ignition Checkout and Pilot Adjustment.
1. The pilot flame must not smother or snuff out when tested
as follows:
a. Main burner ignition from cold start – repeat.
b. Continued operation of main burner.
c. Main burner ignition with appliance at maximum oper-
ating temperature after prolonged operation.
NOTE: Observe operation of the pilot burner with appli-
ance doors in the final operating position. Use of a mirror
may be helpful.
2. Safety Shutdown Checkout
a. For proper operation the pilot should engulf the thermo-
couple or flame sensor as shown above.
b. To adjust pilot, turn pilot flow adjustment screw on valve
clockwise or counterclockwise to give a steady flame
enveloping 10 mm to 13 mm (3/8 to 1/2 inch) of the tip of
the thermocouple or flame sensor. Note that turning the
pilot adjust screw clockwise will decrease the pilot
flame.
c. Check safety shutdown of gas valve by following proce-
dure outlined in "CARE and MAINTENANCE" section.
WARNING: THE FLOW OF COMBUSTION AND VENTILATING
AIR TO THE BOILER SHOULD NOT BE OBSTRUCTED.
This section must be brought to the attention of the owner by
the installer so that the owner can make the necessary
arrangements with a qualified service agency for the periodic
care and maintenance of this boiler. The installer must inform
the owner that the gas supplier can recommend a number of
qualified service agencies. The installer must also inform the
owner that the lack of proper care and maintenance of this
boiler and any fuel burning equipment may result in a haz-
ardous condition.
1. GENERAL MAINTENANCE (Refer also to Owner’s
Information Manual)
These operations are recommended to be performed at
regu lar intervals:
A. BOILER HEATING SURFACES: clean off all coatings
found.
B. BOILER CONTROLS: check contacts, settings, correct
functioning.
C. PIPING: check piping and accessories for leaks.
D. CHIMNEY VENTING SYSTEM: check for obstructions
and leaks.
E. BOILER ROOM AIR SUPPLY: check air supply openings
for continued POSITIVE supply of air as required. Air
needs are greatest in cold weather. Air vents must be
open and free of obstruction.
F. WATER SYSTEM CHECK:
1. System to be full of water, and pressure to remain sta-
ble 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, venting
may be necessary.
B. Regular loss of water from water boiler system may indi-
cate either a system leak, or a faulty air control system,
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 compe-
tent serviceperson to help insure safe and reliable oper-
ation.
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 15). It is
suggested that paper be placed on burners to collect
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 dispose
of paper and accumulated material.
d. If burner surfaces are not clean, or if uneven flame
indicates plugged burner ports, remove and clean
burners.
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 remove burner from orifice.
4. Clean and replace burners* and pilot. Adjust burners as
described on page 16.
*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
16
Sentinel
Figure 13.
Figure 14.
CARE AND MAINTENANCE
10–13 mm (3/8 – 1/2")
