LG R5TT20F-SA1 Engineering Product Data Book page 32

Heat Pump Water Heater
14. Installation
Installing T&P Relief Valve
Use T&P relief valve included in packing.
1
Apply Teflon tape on the G end to prevent
leaking.
2
Install the T&P relief valve in the opening
marked T&P relief valve.
Connecting T&P Relief
Valve Discharge Pipe
! WARNING
The pressure rating of the relief valve
must not exceed 1MPa, the maximum
working pressure of the water heater as
specified on the data plate.
! WARNING
DO NOT connect any valve or other
restriction to the T&P plumbing. DO NOT
connect the T&P plumbing to the
condensate plumbing. It must be
directly piped to an adequate open
drain.
Install T&P Relief Valve discharge pipe
according to local codes and the following
instructions.
- The inside diameter of the discharge pipe must
be at least 3/4".
- The discharge pipe must be approved for hot
water distribution and withstand 100°C without
distortion.
31
- 50 Hz (R134a)
- The end of the discharge pipe should not be
threaded or concealed and should be
protected from freezing.
- Do not insert or install any type of valve,
restriction, or reducer coupling in the discharge
pipe.
1
2
3
Apply Teflon tape on the NPT end to prevent
leaking.
Attach the discharge pipe to outlet of the
T&P relief valve. The discharge pipe must
pitch downward from the valve to allow
complete drainage of both T&P relief valve
and discharge pipe.
The end of the discharge pipe must be
piped to an adequate open drain.