Weil-McLain CGi 4 Series Manual page 35

CGi
SERIES 4 — GAS-FIRED WATER BOILER —
7b
Start-up — operate boiler
Start the boiler
• Follow the
Operating instructions
the boiler.
• See if boiler fails to start.
Section 7c
Check system and boiler
1.
Check system piping for leaks.
and repair immediately.
2. using manual vents. Air in the system
Vent air from system
will interfere with circulation and cause heat distribution
problems and noise.
3. thoroughly for signs of deterioration
Inspect vent system
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
spillage and carbon monoxide emissions which
will result in severe personal injury or death.
4.
Check around the boiler
of Section of this manual.
7a
5. per Section
Verify operation
cedure in Section , and fill in the
8
on the same page.
certificate
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.
7c
Start-up — if boiler doesn't start . . .
Check for:
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?
Part Number 550-142-302/0520
from Section to start
9c
If found, shut down boiler
to prevent flue gas
for gas odor following the procedure
. Perform check-out pro-
7b
Installation and service
)
Boiler Manual
(continued)
Main burner flame (
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).
Figure 28 Typical pilot burner flame
Figure 29 Typical main burner flame
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
section of this manual.
ing , 11
)
Figure 29
Troubleshoot-
35