lp-505 Rev. 000 Rel. 015 Date 1.7.20
24
Figure 17 - Relief Valve Details
To avoid water damage or scalding due to relief valve operation:
• Discharge line must be connected to relief valve outlet and
run to a safe place of disposal. Terminate the discharge line
in a manner that will prevent possibility of severe burns or
property damage should the relief valve discharge.
• Discharge line must be as short as possible and the same
size as the valve discharge connection throughout its
entire length.
• Discharge line must pitch downward from the valve
and terminate at least 6” above the oor drain, making
discharge clearly visible.
• Discharge line shall terminate plain, not threaded, with a
material serviceable for temperatures of 375
o
F or greater.
• Do not pipe discharge to any location where freezing could
occur.
• No shuto valve may be installed between the relief valve
and water heater or in the discharge line. Do not plug or
place any obstruction in the discharge line.
• Test the operation of the relief valve after lling and
pressurizing the system by lifting the lever. Make sure the
valve discharges freely. If the valve fails to operate correctly,
replace it with a new relief valve.
• Test relief valve at least once annually to ensure the
waterway is clear. If valve does not operate, turn the water
heater “o” and call a plumber immediately.
• Take care whenever operating relief valve to avoid scalding
injury or property damage.
• For water heaters installed with only a pressure relief valve,
the separate storage vessel must have a temperature and
pressure relief valve installed. This relief valve shall comply
with Relief Valves for Hot Water Supply Systems, ANSI
Z21.22 CSA4.4.
FAILURE TO COMPLY WITH THE ABOVE GUIDELINES COULD
RESULT IN FAILURE OF RELIEF VALVE OPERATION, RESULTING
IN POSSIBILITY OF SUBSTANTIAL PROPERTY DAMAGE, SEVERE
PERSONAL INJURY, OR DEATH.
RE-INSPECTION OF RELIEF VALVES: Valves should be inspected
AT LEAST ONCE EVERY THREE YEARS, and replaced if necessary,
by a licensed plumbing contractor or qualied installer / service
technician to ensure that the product has not been aected
by corrosive water conditions and to ensure that the valve and
discharge line have not been altered or tampered with illegally.
Certain naturally occuring conditions may corrode the valve and
its components over time, rendering the valve inoperative. Such
conditions can only be detected if the valve and its components are
physically removed and inspected. Do not attempt to conduct an
inspection on your own. Contact your plumbing contractor for a
re-inspection to assure continued safety.
Do not thread a cap or plug into the relief valve or relief valve
line under any circumstances! Explosion and property damage,
serious injury, or death may result.
FAILURE TO RE-INSPECT THE RELIEF VALVE AS DIRECTED COULD
RESULT IN UNSAFE TEMPERATURE AND/OR PRESSURE BUILD-UP
WHICH CAN RESULT IN PROPERTY DAMAGE, SERIOUS PERSONAL
INJURY, OR DEATH.
The water heater must be full of water and the system fully purged
BEFORE powering the water heater. When lling the water heater,
open a hot water tap to release air in the water heater and piping.
All air has been purged from the system when water runs freely from
the faucets.
Applying power to the water heater when it is not full of water will
damage the heat exchanger, and could result in property damage,
serious personal injury, or death. Such damages ARE NOT covered
by water heater warranty.
H. Filling the Heater
• Ensure any drain valves are completely closed.
• Open the shut-o valve in the cold water supply line.
• Open the hot water faucets to allow air to vent from the heater
and piping.
• Allow sucient time for the heater to completely ll with water.
Part 5 - Venting
The heater must be vented as detailed in this section. Ensure exhaust
vent and intake piping complies with these instructions regarding
vent system. Inspect nished exhaust vent and intake piping
thoroughly to ensure all joints are well secured, airtight, and comply
with all applicable code requirements, as well as the instructions
provided in this manual. Failure to properly install the vent system
will result in severe personal injury or death.
required. DO NOT operate this water heater before the supplied
pressure relief valve is installed with sucient relieving capacity in
accordance with the rating plate on the water heater.
Pressure relief valves must be installed as close to the water heater
as possible. No other valves should be placed between the pressure
relief valve and the appliance. DO NOT install a relief valve with a
pressure rating greater than 150 psi. This is the maximum allowable
relief valve setting for this water heater.
After installing the relief valve and lling and pressurizing the
system, test the operation of the valve by lifting the lever. Make
sure the valve discharges freely. If the valve fails to operate correctly,
replace it with a new relief valve. Ensure that the maximum BTU/H
rating on the pressure relief valve is equal to or greater than the
maximum input BTU/H rating of the combination water heater.
A. General
This heater is certied as a “Category IV” appliance and requires a
special venting system. The vent system will operate with a positive
pressure in the pipe. Exhaust gases must be piped directly outdoors
using the vent materials and rules outlined in these instructions. Do
not connect vent connectors serving appliances vented by natural
draft into any portion of mechanical draft systems operating under
positive pressure. Follow the venting instructions carefully. Failure
to do so will result in substantial property damage, severe personal
injury, or death.
Exhaust and intake are to be piped separately. This heater cannot
share a common exhaust or intake with multiple appliances. Failure
to follow these instructions will result in substantial property
damage, severe personal injury, or death.
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