Flow Switch And Relief Valve Installation - Lochinvar 400 Installation & Operation Manual

6
Hydronic piping
Flow switch,
temperature and
installation
Basic steps are listed below to guide you through the
installation of the flow switch, relief valve, and temperature
and pressure gauge provided with the unit.
1. For Models 400 - 501 install the close nipple on the
outlet connection of the heat exchanger. Install the tee
with the 3/4 inch fitting positioned vertically and on
the top as shown in FIG. 6-1. For Models 601 - 801
install the tee directly to the outlet connection of the
heat exchanger with the 3/4 inch fitting positioned
vertically and on the top (see FIG. 6-2).
2. For Models 701 - 801 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 - 601 install the
relief valve directly into the 3/4 inch fitting 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 fitting positioned
vertically and on the top (FIG. 6-1).
5. Attach paddle #3 to the flow switch per the
manufacturer's instructions.
6. Install the assembled flow switch into the 1 inch fitting
of the tee installed in Step 4 (see FIG. 6-1).
7. Install a field provided close nipple on the downstream
side of the flow switch (see FIG.'s 6-1 and 6-2).
8. Install a field provided tee with the gauge fitting
positioned vertically and on the top (FIG.'s 6-1 and
6-2)
9. Install the temperature and pressure gauge provided
with the unit into the top fitting of the tee (a bushing
may be necessary) installed in Step 8 (FIG.'s 6-1 and
6-2).
Be sure to install the flow switch so that
NOTICE
the arrow on the flow switch is pointing
in the direction of the flow (see FIG.
6-3).
(continued)
relief valve and
pressure gauge
Installation & Operation Manual
Figure 6-1 Flow Switch, Relief Valve and Temperature and
Pressure Gauge Installation_Models 400 - 501
RELIEF VALVE
FLOW SWITCH
PADDLE
TEMPERATURE AND
PRESSURE
GAUGE
TEE WITH FITTING ON TOP
(FIELD PROVIDED)
CLOSE NIPPLE (FIELD PROVIDED)
TEE WITH 1" FITTING ON TOP
CLOSE NIPPLE
TEE WITH 3/4" FITTING ON TOP
CLOSE NIPPLE
Figure 6-2 Flow Switch, Relief Valve and Temperature and
Pressure Gauge Installation_Models 601 - 801
RELIEF VALVE
FLOW SWITCH
PADDLE
TEMPERATURE AND
PRESSURE
GAUGE
TEE WITH FITTING ON TOP
(FIELD PROVIDED)
TEE WITH 1" FITTING ON TOP
CLOSE NIPPLE
TEE WITH 3/4" FITTING ON TOP
CLOSE NIPPLE
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