Part Number 550-142-302/0520
CGi
SERIES 4 — GAS-FIRED WATER BOILER —
Boiler Manual
35
Start the boiler
• Follow
the
Operating instructions
from Section
9c
to start
the boiler.
• See
Section 7c
if boiler fails to start.
Check system and boiler
1.
Check system piping for leaks.
If found, shut down boiler
and repair immediately.
2.
Vent air from system
using manual vents. Air in the system
will interfere with circulation and cause heat distribution
problems and noise.
3.
Inspect vent system
thoroughly for signs of deterioration
from corrosion, physical damage or sagging. In addition —
Check for gas-tight seal at every connection and seam.
Venting system must be sealed gas-tight
to prevent flue gas
spillage and carbon monoxide emissions which
will result in severe personal injury or death.
4.
Check around the boiler
for gas odor following the procedure
of Section
7a
of this manual.
5.
Verify operation
per Section
7b
. Perform check-out pro-
cedure in Section
8
, and fill in the
Installation and service
certificate
on the same page.
Start-up — operate boiler
(continued)
7b
Check burner flames
View pilot and main flames through the inspection port in the
base burner shield.
Pilot burner flame
(
Figure 28
)
PROPER
pilot flame characteristics
1. Blue
flame.
2. Inner cone engulfing pilot flame sensor.
3. Pilot flame sensor glowing cherry red.
IMPROPER pilot flame characteristics
1. Overfired — Large flame lifting or blowing past pilot
flame sensor.
2. Underfired — Small flame. Inner cone not engulfing
pilot flame sensor.
3. Lack of primary air — Yellow flame tip.
4. Incorrectly heated pilot flame sensor.
Figure 28
Typical pilot burner flame
Figure 29
Typical main burner flame
Main burner flame
(
Figure 29
)
PROPER main burner flame characteristics
1. Yellow-orange streaks may appear (caused by dust).
IMPROPER main burner flame characteristics
1. Overfired — Large flames.
2. Underfired — Small flames.
3. Lack of primary air — Yellow tipping on flames
(sooting will occur).
Check for:
7c
4. Gas not turned on at meter or boiler?
5. Incoming gas pressure less than:
5” w.c. for natural gas? 11” w.c. for propane gas?
6. If none of the above corrects the problem, refer to
Troubleshoot-
ing
,
section
11
of this manual.
1. Loose connections, blown fuse or ser-
vice switch off?
2. High limit switch set below boiler water
temperature?
3. Thermostat set below room tempera-
ture?
Start-up — if boiler doesn’t start . . .
