Lochinvar 151 - 801 Operation Manual Download Page 13

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System piping

System water piping methods

Observe a minimum of 1/4 inch clearance around all
un-insulated hot water pipes when openings around the pipes
are not protected by non-combustible materials.

General piping information

Basic steps are listed below along with illustrations on the
following pages (FIG.’s 3-6 thru 3-10), which will guide you
through the installation of the outdoor water heater.

1. Connect the cold water supply to the inlet side of the water

heater.

2. Connect the hot water supply to the outlet side of the water

heater.

3. Install a backflow preventer on the cold feed make-up water

line.

4. Install the factory supplied pump as shown in FIG.’s 3-6

thru 3-10. If pump is installed outdoors use pump cover,
reference the

Pump Cover Installation

section on this page.

5. Install an expansion tank on the system supply. Consult the

tank manufacturer’s instruction for specific information
relating to tank installation. Size the expansion tank for the
required system volume and capacity.

6. Install a drain valve at the lowest point of the system.

7. This appliance is supplied with a relief valve sized in

accordance with ASME Boiler and Pressure Vessel Code,
Section IV (“Heating Boilers”). Pipe the discharge of the
safety relief valve to a suitable drain to prevent injury in
the event of pressure relief. Pipe the discharge to a drain.
Provide piping that is the same size as the safety relief valve
outlet. Never block the outlet of the safety relief valve.

See the *piping illustrations included in this section, FIG.’s 3-6
thru 3-10 for suggested guidelines in piping the outdoor water
heater.

*Please note that these illustrations are meant
to show system piping concept only, the
installer is responsible for all equipment and
detailing required by local codes.

NOTICE

Flow switch and relief valve installation

Basic steps are listed below to guide you through the installation
of the flow switch and relief valve provided with the unit.

1. Install the tee with the 3/4 inch fitting positioned vertically

and on the top as shown in FIG. 3-3.

2. Install the relief valve into the 3/4 inch fitting of the tee

installed in Step 1 (FIG. 3-3).

3. Install the close nipple on the downstream side of the

temperature and pressure relief valve tee (FIG. 3-3).

4. Install the tee with the 1 inch fitting positioned vertically

and on the top (FIG. 3-3).



WARNING

The relief valve, tee and other necessary
fittings are shipped in the install kit with the
water heater and are to be field installed.

Pump cover installation

reference FIG.’s 3-1 and 3-2 for

pump cover installation)

If the water heater was purchased with a pump, please follow
the instructions below to install the pump and outdoor cover
assembly. If a field supplied pump is used, ensure that it
is installed per the manufacturer’s specification in regard
to indoor or outdoor location. An outdoor rated pump is
recommended.

1. Locate the pump, pump cover assembly, flange kit and

additional mounting nuts.

2. Before installing the pump, ensure the intended piping

location allows room for the sheet metal cover assembly

without

interference.

3. Install the pump with the provided flanges and hardware.

4. Mount the pump cover base sheet metal aligning the holes

for the piping and the bolts.

5. Using additional nuts, secure the sheet metal to the pump
bolts.

6. Install the sheet metal top on the base with the provided
screws

(10x).