Relief Valve Installation - Lochinvar FTxl 400 Installation & Operation Manual

6
Hydronic piping
Relief valve and
pressure gauge installation
Basic steps are listed below to guide you through the
installation of the relief valve, and temperature and pressure
gauge provided with the unit.
1. Install the tee directly to the outlet connection of the
heat exchanger with the 3/4 inch fi tting positioned
vertically and on the top (see FIG. 6-2).
2. For Models 725 - 850 install the 3/4 inch close nipple
in the tee. Install the relief valve on the 3/4 inch close
nipple (FIG. 6-2). For Models 400 - 600 install the
relief valve directly into the 3/4 inch fi tting on the tee
(FIG. 6-1).
3. Install the close nipple on the downstream side of
the relief valve tee (FIG. 6-1).
4. Install the tee with the 1 inch fi tting positioned
vertically and on the top (FIG. 6-1).
5. Install a fi eld provided close nipple on the downstream
side of the fl ow switch (if used), see FIG.'s 6-1 and 6-2.
6. Install a fi eld provided tee with the gauge fi tting
positioned vertically and on the top (FIG.'s 6-1 and
6-2)
7. Install the temperature and pressure gauge provided
with the unit into the top fi tting of the tee (a bushing
may be necessary) installed in Step 6 (FIG.'s 6-1 and
6-2).
If using a fl ow switch, be sure to install
NOTICE
the fl ow switch so that the arrow on the
fl ow switch is pointing in the direction
of the fl ow.
38
temperature and
Installation & Operation Manual
Figure 6-1 Flow Switch, Relief Valve and Temperature and
Pressure Gauge Installation_Models 400 - 600
Figure 6-2 Flow Switch, Relief Valve and Temperature and
Pressure Gauge Installation_Models 725 - 850