Modulex EXT Commercial Series Boilers User Manual
CHAPTER 4: Installation Instructions
Page
34
of
144
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0095_0H
09/15/2017
Phone: 800-526-0288
GF-139
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:
•
On
newer
models (with aluminum headers), the 1-1/2” Pressure Relief Valve is pre-
installed inside the boiler chassis at the factory.
•
On
older
units, 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 4-6. The manifold assembly components supplied are:
•
1-1/2” Pressure Relief Valve –
must be installed on older models only
•
Flow Switch
•
Pressure/Temperature Gauge
The pressure relief valve and all other manifold components are shown in Figure 4-6.
OLDER MODELS NEWER MODELS
Figure 4-6: CSD-1 Manifold Assembly and Components
Complete the instructions below to install the pressure relief valve and the other components.
NOTE:
Use Teflon tape or a suitable pipe joint compound for component and piping connections
described in the following steps. Refer to Figure 4- 6 for component identification.
Installing the Pressure Relief Valve and Flow Switch
1. Attach manifold to the outlet supply connection on the boiler via the flanged connections.
2. Cut the flow switch paddle for 4” pipe, as directed in the flow switch paddle packaging. For
installations expecting less than a 10 gpm flow, the switch must be adjusted as follows:
a) With no flow, turn adjustment screw on the switch counter-clockwise until the switch
trips.
b) Then turn screw 1/2 turn clock-wise and continue installation.
1-1/2” Pressure Relief Valve
Flow Switch
Pressure/
Temperature
Gauge
