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Part number 550-142-054/0411
GV90+ gas-fired water boiler — Boiler Manual
62
Start-up (continued)
Figure 72 Check for igniter glow by looking into
observation port on front of blower
housing
Final checks before starting boiler
❏
Review the boiler sequence of operation in Figure 75, page 65.
❏
Verify that the boiler and system are full of water and all system
components are correctly set for operation.
❏
High altitude locations (over 5,500 feet) — verify that the high
altitude pressure switch is installed per page 10.
❏
Verify that condensate trap has been filled with water.
❏
Verify electrical connections are correct and securely attached.
❏
Inspect vent piping and air piping for signs of deterioration from
corrosion, physical damage or sagging. Verify air piping and vent
piping are intact and correctly installed per this manual.
To start the boiler
1. Turn OFF the boiler ON/OFF switch.
2. Read and follow the Operating Instructions, Figure 76, page 66.
If boiler does not start correctly
1. Check for loose connections, blown fuse or service switch off?
2. Is external limit control (if used) open? Is boiler water temperature
above boiler limit setting?
3. Is thermostat set below room temperature?
4. Is gas turned on at meter or boiler?
5. Is incoming gas pressure less than 4” w.c.?
6. If none of the above corrects the problem, refer to Troubleshooting,
beginning on page 75.
Check system and boiler after start-up
❏ Check water piping
1. Check system piping for leaks. If found, shut down boiler and
repair immediately. (See WARNING on page 60 regarding failure
to repair leaks.)
2. Vent any remaining air from system using manual vents. Air in the
system will interfere with circulation and cause heat distribution
problems and noise.
❏ Check vent piping and air piping
1. Check for gas-tight seal at every connection and seam of air piping
and vent piping.
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.
❏ Check gas piping
1. Check around the boiler for gas odor following the procedure of
page 54 of this manual.
If you discover evidence of any gas leak, shut
down the boiler at once. Find the leak source
with bubble test and repair immediately. Do
not start boiler again until corrected. Failure
to comply could result in severe personal
injury, death or substantial property damage.
❏ Check the igniter
1. Inspect the igniter to verify operation as shown in Fig-
ure 72. The igniter glow may be difficult to see clearly,
depending on room lighting.
Gas valve adjustment — altitude
over 5,500 feet ONLY
Apply the following only when:
• Altitude is over 5,500 feet above sea level.
• You have obtained a high altitude kit (with tools needed)
and installed high altitude air pressure switch per the
instructions on page 10.
• Boiler has started correctly, following procedures on
previous pages.
You will need the tools shown in Figure 73. Adjust the gas
valve outlet pressure only if required as described in the
following instructions.
Connect and adjust manometer
1. Remove boiler jacket top and front panels.
2. Close manual gas supply valve and turn off electrical
power to boiler.
3. Using common bit screwdriver, remove outlet pressure
tap plug from gas valve and save plug (Figure 74).
4. Place the negative side of the manometer hose over end
of outlet pressure tap barrel.