Lennox International Inc. Lennox CompleteHeatTM COMBINATION HEATING SYSTEM - Manual (Page 9)

Page 8
KEEPING YOUR SYSTEM IN TOP FORM-CONT.
HM30 Temperature / Pressure Relief Valve Testing
This valve is a safety device to protect
against abnormally high temperature
and pressures. Periodic discharge of
the relief valve may indicate thermal
expansion within a closed system.
A thermal expansion tank will be needed to
allow water to expand.
If the valve discharges, it is doing so because there is
a problem. Call your Lennox dealer or qualified
technician to inspect the unit for proper
operation. Do not ignore the water disĆ
charge. Never plug the T&P relief valve.
WARNING
Danger of Personal Injury from Scalding.
Water from T&P relief valve may be exĆ
tremely hot and is not tempered. Use exĆ
treme caution when discharging valve. ReĆ
placement of T&P valve should be done by
a trained professional or a licensed plumbĆ
ing contractor.
T&P valve testing should be done annualĆ
ly. Remove HM30 top access panel. LoĆ
cate the temperature and pressure relief
valve.
Test the T&P valve by lifting the lever
up until the valve unseats. This allows
the water to discharge. Never open the T&P valve unless it is connected to a discharge line.
If water does not flow, valve may be obstructed or corroded. Call your Lennox dealer or qualified techniĆ
cian to inspect the valve.
Drain
T&P Valve
Drain Line
WARNING - Water from
valve may be extremely hot.
Use extreme caution when
discharging valve.
TEMPERATURE / PRESSURE (T&P) RELIEF VALVE
TESTING PROCEDURE
Test Lever
(Lift up to discharge water)
Temperature & Pressure
Relief Valve
Drain Line
HM30
Unit
HM30 Top
Access Cover