Modulex Light Commercial Series
CHAPTER 4: Installation Instructions
OMM-0158_A
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4.12 Flow And Return Pipe Connections
The cold and hot water flow and return circuits must be connected to the boiler via the respective
2½” M and R connections, as indicated in Table 3-1 (in Section 3.3, above).
When determining the size of the cold/hot water circuit pipes, bear in mind the pressure losses
induced by any of the system’s components and by the configuration of the system.
When planning the routing of the cold/hot water piping, take the necessary precautions to avoid
air traps and pockets and to facilitate the continuous purging of the system.
W A R N I N G !
•
Before installing the boiler, we recommend that the system be 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.
•
It is absolutely forbidden to fit on-off valves in the piping before the required safety devices.
4.13 Pressure Relief Valve (Supplied)
Each unit is delivered with a 3/4 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 4-15).
4.14 Csd-1 Manifold Assembly (Supplied)
The installation of a flow switch and pressure/temperature gauge are required. A 3/4" Pressure
Relief Valve designed for the boiler output capacity must also be installed
at the 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 4-17. The manifold assembly components supplied are:
•
3/4” Pressure Relief Valve
•
Flow Switch
•
Pressure/Temperature Gauge
3/4” PRESSURE RELIEF VALVE
FLOW SWITCH
PRESSURE/
TEMPERATURE
GAUGE
Figure 4-15: CSD-1 Manifold Assembly and Components
