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11Part Number 550-110-592/1000
Operate boiler relief valve
❏ Service every 6 months . . . . . . . . .
To avoid water damage or scalding
due to valve operation, a metal
discharge line must be connected to
relief valve outlet and run to a safe
place of disposal. This discharge line
must be installed by a qualified
heating installer or service
technician in accordance with the
instructions in the Boiler Manual.
The discharge line must be
terminated so as to eliminate
possibility of severe burns should
the valve discharge.
1. Before proceeding, verify that the relief valve outlet
has been piped to a safe place of discharge, avoiding
any possibility of scalding from hot water.
2. Read the boiler pressure/temperature gauge to make
sure the system is pressurized.
3. Lift the relief valve top lever slightly, allowing water
to relieve through the valve and discharge piping.
4. If water flows freely, release the lever and allow the
valve to seat. Watch the end of the relief valve
discharge pipe to ensure that the valve does not
weep after the line has had time to drain. If the
valve weeps, lift the seat again to attempt to clean
the valve seat. If the valve continues to weep
afterwards, contact your qualified service technician
to inspect the valve and system.
5. If water does not flow from the valve when you lift
the lever completely, the valve or discharge line may
be blocked. Immediately shutdown the boiler,
following the instructions on the inside jacket top
Lighting Instructions. Call your qualified service
technician to inspect the boiler and system.
Figure 9 Gauge glass
Clean gauge glass
❏ Service periodically continued . . . . . . .
Boiler pressure must be low to eliminate potential of
severe burns.
Normal waterline on a steam boiler is halfway up gauge
glass. See Figure 9. Clean when needed.
1. Close lower gauge cock.
2. Open pet cock.
3. Open lower gauge cock and allow a small amount
of water to flush out through open pet cock.
4. Close pet cock.
5. Open lower gauge cock.
6. If gauge glass breaks, close both gauge cocks and
call a qualified service technician to replace gauge
glass. Do not replace with thin glass tubing.
Gauge glass
Pet cock
Waterline
Gauge
cock
Gauge
cock
59206