Operating instructions

Part number 550-141-887/0800
20
AHE Series 4 Direct Vent Wall-Mounted Boilers — Boiler Manual
8a Start-up
Final check before starting
boiler
Boiler water
Review Manual Section 4, pages 15 through 17,
regarding water piping, treatment, freeze protection and
system pressure testing.
Verify boiler is filled with water.
Check for gas leaks
Before starting the boiler and during
initial operation, smell near the floor
and around the boiler for gas
odorant or any unusual odor. Do not
proceed with start-up if there is any
indication of a gas leak. Repair any
leak at once.
Propane boilers only — Your
propane supplier mixes an odorant
with the propane to make its
presence detectable. In some
instances, the odorant can fade, and
the gas may no longer have an odor.
Before start-up (and periodically
thereafter), have the propane
supplier verify the correct odorant
level in the gas.
Start the boiler
Follow the “Operating instructions” found on pages 24-
25 to start the boiler. Refer to Section 8b, below, if boiler
fails to start.
Check burner flames
1. Refer to Figure 30, item 9 on page 42. Remove
burner input plenum cover.
2. Visually inspect burner flames:
•
Proper main burner flame (see Figure 16):
a. Yellow-orange streaks may appear (caused
by dust).
• Improper main burner flame:
a. Overfired — Large flames.
b. Underfired — Small flames.
c. Lack of primary air — Yellow tipping on
flames (sooting will occur).
Figure 16 Typical main burner flame
26024
Transparent
blue flame
Inner flame
8b Start-up — if boiler fails to start...
Check for:
1. Loose connections, blown fuse or service switch?
2. High limit switch set below boiler water
temperature?
3. Thermostat set below room temperature?
4. Gas not turned on at meter?
5. Gas not turned on at boiler (manual main shutoff
and gas valve)?
6. Incoming gas pressure less than:
• 5" w.c. for natural gas?
• 11" w.c. for propane gas?
If none of the above corrects the problem, refer to
“Troubleshooting” section, pages 32-41.