Pressure Relief Valve; Manifold Assembly (Supplied) - Watts AERCO EXT Installation, Operation & Maintenance Manual

Modulex EXT Commercial Series
CHAPTER 4: Installation Instructions
W A R N I N G !
Before installing the boiler, we recommend that the system is flushed out with a suitable cleaning
product in order to eliminate any metallic tooling or welding residues, or oil and grime, which
could reach the boiler and affect the proper functioning of the boiler.
Ensure that the system piping is NOT used for earth grounding of electrical or telephone
systems. Such grounding of system piping is unsuitable and can cause serious damage to the
piping, boiler, and radiators.
DO NOT FIT ON-OFF VALVES IN THE PIPING BEFORE THE REQUIRED SAFETY DEVICES.

4.11 Pressure Relief Valve

Each unit is delivered with a 1-1/2 inch, 80 psi Pressure Relief Valve that complies with the
ANSI/ASME ANSI Z21.13 / CSA 4.9 Boiler and Pressure Vessel Code, Section IV (''Heating
Boilers''), and CSA B51, Boiler, Pressure vessel, and Pressure Piping Code, as applicable.
NOTE: Lower system pressures require lower rated Pressure Relief Valves (not supplied).
The Pressure Relief Valve is included separately in the shipping container. It must be fitted on
the CSD-1 manifold at the site, per the instructions in the next section (see Figure 4-5).
I M P O R T A N T !
Discharge piping MUST be installed at the relief valve discharge, and must run to a safe place
of disposal. The discharge piping must be installed in accordance with local codes.
4.12 CSD-1 Manifold Assembly (Supplied)
The installation of a flow switch and pressure/temperature gauge are required. A 1-1/2" Pressure
Relief Valve designed for the boiler output capacity must also be installed:
The 1-1/2" Pressure Relief Valve must be installed on-site (see Step 4).
These components are supplied with the boiler and must be assembled and wired when the boiler
is installed at the site. The manifold components are shown installed into the CSD-1 manifold in
Figure 4-5. The manifold assembly components supplied are:
•
1-1/2" Pressure Relief Valve
•
Flow Switch
•
Pressure/Temperature Gauge
The pressure relief valve and all other manifold components are shown below.
OMM-0160_A • DRAFT Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
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