John Wood 6-120, Instruction Manual

10

If, after manually operating the valve, it fails to completely reset and 
continues to release water, immediately close the cold water inlet 
to the water heater, follow the draining instructions, and replace the 
temperature-pressure relief valve with a new one.

FILLING THE WATER HEATER

Never use this water heater unless it is completely full of 
water. To prevent damage to the tank and heating element(s), 
the tank must be completely filled with water.  Water must 
flow from the hot water faucet before turning “ON” electrical 
supply to the water heater. The manufacturer will not warrant 
any elements damaged by failure to follow instructions.

To fill the water heater with water:

1.  Close the water heater drain valve by turning the handle 

to the right (clockwise). The drain valve is on the lower 
front of the water heater.

2. Open the cold water supply valve to the water heater.  

NOTE: The cold water supply valve must be left open 
when the water heater is in use.

3.  To ensure complete filling of the tank, allow air to exit by 

opening the nearest hot water faucet. Allow water to run 
until a constant flow is obtained. This will let air out of the 
water heater and the piping.

4. Check all water piping and connections for leaks. Repair 

as needed.

5.  Never alter or modify the certified construction of the water 

heater or its components, or bypass any safety features. 
Doing so voids all warranties.

T&P VALVE and PIPE INSULATION 

(On Selected Models)

1.  Locate the temperature and pressure relief valve on the water 

heater (also known as a T&P relief valve).  See Figure 5.

2. Locate the slit running the length of the T&P relief valve 

insulation.

3.  Spread the slit open and 

fi

 t the insulation over the T&P relief 

valve.  See Figure 5.  Apply gentle pressure to the insulation to 
ensure that it is fully seated on the T&P Relief Valve.  Once seated, 
secure the insulation with duct tape, electrical tape, or equivalent. 
IMPORTANT: The insulation or tape must not block the discharge 
opening or hinder access to the manual relief lever (Figure 5).  
Ensure a discharge pipe is installed into the T&P valve discharge 
opening per the instructions in this manual.

4.  Locate the hot water (outlet) & cold water (inlet) pipes to the water 

heater.

5.  Locate the slit running the length of a section of pipe insulation.
6.  Spread the slit open and slip the insulation over the cold water 

(inlet) pipe. Apply gentle pressure along the length of the insulation 
to ensure that it is fully seated around the pipe.  Also, ensure that 
the base of the insulation is 

fl

 ush with the water heater. Once 

seated, secure the insulation with duct tape, electrical tape, or 
equivalent.

7.  Repeat steps 5 and 6 for the hot water (outlet) pipe.
8.  Add additional sections of pipe insulation as needed.

T&P Relief Valve

T&P Relief Valve 

Drain Line

Manual Relief Lever

T&P Relief Valve Insulation

FIGURE  5.