Lx – WH Series Installation and Operation Instructions
│
Trinity Lx
45
Near Water Heater Plumbing
Pressure Relief Valve -
A Pressure Relief Valve is factory supplied with each unit and must be field installed at
the water heater outlet in the vertical position, as shown in Figures 10-1(a) and (b), with the drain pipe outlet
exiting the side of the pressure relief valve horizontally and elbowing down. Lx200WH-Lx400WH models
come with a 125 psi relief valve, while Lx500WH-Lx800WH models come with a 150 psi relief valve. The
maximum allowable working pressure (MAWP) varies with water heater model, see Table 10-2; alternate
relief valves may be used, so long as they are ASME certified and meet the requirements for the respective
water heater.
If installed with the incorrect orientation (horizontally with drain pipe out the bottom) the
relief valve may not function properly resulting in property damage or personal injury.
Ensure the discharge of the pressure relief is piped to a location where the steam or water
will not cause property damage or serious injury.
Pressure Gauge –
Trinity Lx units come with a factory supplied Pressure Gauge. The pressure gauge must be
installed at the water heater outlet, prior to any circulators, and in the vicinity of the pressure relief valve. See
Figures 10-1(a) and (b).
Table 10-2 Pressure Relief Valve Specifications
Water heater
Model
Maximum Pressure Relief Valve Setting
/ Water heater MAWP (psi)
Minimum Pressure Relief
Valve Capacity (MBH)
Lx200WH
145
200
Lx300WH
160
300
Lx400WH
145
400
Lx500WH
160
500
Lx600WH
160
600
Lx700WH
160
700
Lx800WH
160
800
