John Wood JW375T75N-AV, Instruction Manual

Page: 12 / 36

12
NOTE: In addition to the factory installed Temperature-Pressure
Relief Valve on the water heater, each remote storage tank that
may be installed and piped to a water heating appliance must also
have its own properly sized, rated and approved Temperature-
Pressure Relief Valve installed. Call the toll free technical support
phone number listed on the back cover of this manual for technical
assistance in sizing a Temperature-Pressure Relief Valve for remote
storage tanks.
For safe operation of the water heater, the Temperature-Pressure
Relief Valve must not be removed from its designated opening nor
plugged. The Temperature-Pressure Relief Valve must be installed
directly into the fitting of the water heater designed for the relief valve.
Install discharge piping so that any discharge will exit the pipe within
6 inches (15.2 cm) above an adequate floor drain, or external to the
building. In cold climates it is recommended that it be terminated at
an adequate drain inside the building. Be certain that no contact is
made with any live electrical part. The discharge opening must not
be blocked or reduced in size under any circumstances. Excessive
length, over 30 feet (9.14 m), or use of more than four elbows can
cause restriction and reduce the discharge capacity of the valve.
No valve or other obstruction is to be placed between the
Temperature-Pressure Relief Valve and the tank. Do not connect
discharge piping directly to the drain unless a 6” (15.2 cm) air gap is
provided. To prevent bodily injury, hazard to life, or property damage,
the relief valve must be allowed to discharge water in adequate
quantities should circumstances demand. If the discharge pipe is
not connected to a drain or other suitable means, the water flow
may cause property damage.
Water Damage Hazard
•
Temperature-Pressure Relief Valve discharge
pipe must terminate at adequate drain.
CAUTION
T&P Valve Discharge Pipe Requirements:
• Shall not be smaller in size than the outlet pipe size of the valve,
or have any reducing couplings or other restrictions.
• Shall not be plugged or blocked.
• Shall not be exposed to freezing temperatures.
• Shall be of material listed for hot water distribution.
•
Shall be installed so as to allow complete drainage of both the
Temperature-Pressure Relief Valve and the discharge pipe.
• Must terminate a maximum of six inches above a floor drain
or external to building. In cold climates, it is recommended
that discharge pipe be terminated at an adequate drain inside
building.
• Shall not have any valve or other obstruction between the
relief valve and the drain.
Burn hazard.
Hot water discharge.
Keep clear of Temperature-
Pressure Relief Valve
discharge outlet.
The Temperature-Pressure Relief Valve must be manually operated
at least twice a year. Caution should be taken to ensure that (1) no
one is in front of or around the outlet of the Temperature-Pressure
Relief Valve discharge line, and (2) the water manually discharged
will not cause any bodily injury or property damage because
the water may be extremely hot. 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 in this manual, and replace the Temperature-
Pressure Relief Valve with a properly rated/sized new one.
NOTE: The purpose of a Temperature-Pressure Relief Valve is to
prevent excessive temperatures and pressures in the storage tank.
The T&P valve is not intended for the constant relief of thermal
expansion. A properly sized thermal expansion tank must be installed
on all closed systems to control thermal expansion, see Closed
Water Systems and Thermal Expansion on page 11.
If you do not understand these instructions or have any questions
regarding the Temperature-Pressure Relief Valve call the toll free number
listed on the back cover of this manual for technical assistance.
FILLING THE WATER HEATER
Never use this water heater unless it is completely full of water. To
prevent damage to the tank, the tank must be filled with water. Water
must flow from the hot water faucet before turning “ON” gas to the
water heater.
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 insure 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.
AIR REQUIREMENTS
Breathing Hazard - Carbon Monoxide Gas
Install water heater in accordance with
the Instruction Manual and NFPA 54 or
CAN/CSA-B149.1.
To avoid injury, combustion and ventilation
air must be taken from outdoors.
Do not place chemical vapor emitting
products near water heater.
Breathing carbon monoxide can cause brain damage or
death. Always read and understand instruction manual.
For safe operation an adequate supply of fresh uncontaminated air for
combustion and ventilation must be provided.
An insufficient supply of air can cause recirculation of combustion
products resulting in contamination that may be hazardous to life.
Such a condition often will result in a yellow, luminous burner flame,
causing sooting of the combustion chamber, burners and flue tubes
and creates a risk of asphyxiation.
Do not install the water heater in a confined space unless an adequate
supply of air for combustion and ventilation is brought in to that space
using the methods described in the Confined Space section that follows.
Never obstruct the flow of ventilation air. If you have any doubts or
questions at all, call your gas supplier. Failure to provide the proper