WeilMcLain-gv90plus-user-manual
Part number 550-142-055/0411
9
GV90+ gas-fired water boiler — User’s Information Manual
Operate boiler relief valve
1. Before proceeding, verify that the relief valve outlet has been piped to a safe place of dis-
charge, avoiding any possibility of scalding from hot water.
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 qualifed heating installer or service techni-
cian in accordance with the instructions in the GV90+ Boiler Manual. The
discharge line must be terminated so as to eliminate possibility of severe burns
should the valve discharge.
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 dis-
charge 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 lighting instructions
on the inside jacket top. Call your qualified service technician to inspect the boiler and
system.
Follow boiler shutdown procedure
1. Follow “TO TURN OFF GAS TO APPLIANCE” on the Operating instruction on the
inside of the jacket top panel. You will also find these instructions on page 12 of this manual.
2. Do not drain system unless exposure to freezing temperatures will occur.
3. Do not drain the system if it is filled with an antifreeze solution.
4. Do not shut down boilers used for domestic water heating. They must operate year-round.
Oil blower motor
1. Remove the jacket top panel to access the blower
motor.
2. Use only Anderol 465. DO NOT use household
universal oils.
Use only Anderol 465 to lubricate the
blower motor. Do not use common uni-
versal household oils.
3. See Figure 4
4. Place a few drops of oil in each of the two oiler cups
on the side of the blower motor.
Figure 4 Blower motor
User maintenance procedures (continued)
EVERY
6 MONTHS
Maintenance
END OF
SEASON
Maintenance