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Modulex Light Commericial Series
CHAPTER 4: Installation Instructions
The nominal inlet working gas pressure measured at the boiler should be 11" W.C. (27 mbar)
for Propane gas (Gas E).
A gas control valve must be installed adjacent to the boiler for isolation purposes.
4.11.1.3 Propane Gas Supply Pressure Requirements
Pressures required at gas valve inlet pressure port:
•
Nominal gas pressure – 11 inches W.C.
•
Maximum gas pressure – 13 inches W.C. with no flow (lockup) or with boiler running.
•
Minimum gas pressure – 8 inches W.C. with gas flowing (verify during boiler startup).
NOTE:
Ensure that the high gas pressure regulator is installed at least 6 to 10 feet upstream of the
boiler.
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 it is essential to 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.
WARNING!
•
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 saftey
devices.
4.13 PRESSURE RELIEF VALVE
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
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).
On newer models (MLX EXT 450, 600, 800 ,1100) with aluminum headers, the Pressure Relief
Valve and first discharge pipe are factory installed inside the unit chassis. However, the second
discharge pipe, included in the shipping container, must be installed on site (see Figure 4-16).
OMM-0087_J • GF-143 • 11/17/2020
Boiler and Pressure Vessel Code, Section IV (''Heating
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Page 42 of 150
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