Lochinvar 399 operation manual 6Hydronic piping continued, Installation & Operation Manual, Notice

Installation & Operation Manual

6Hydronic piping (continued)

Flow switch, relief valve and temperature and pressure gauge 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 399 - 500 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 600 - 800 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 700 - 800 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 399 - 600 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).

Figure 6-1Flow Switch, Relief Valve and Temperature and Pressure Gauge Installation_Models 399 - 500

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

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).

Figure 6-2Flow Switch, Relief Valve and Temperature and Pressure Gauge Installation_Models 600 - 800

RELIEF VALVE

CLOSE NIPPLE

FLOW SWITCH

PADDLE

TEMPERATURE AND

PRESSURE

GAUGE

NOTICE

Be sure to install the flow switch so that the arrow on the flow switch is pointing in the direction of the flow (see FIG. 6-3).

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

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