Boiler Connections; Changing Exhaust Outlet Location - Watts AERCO MLX EXT 321 Installation, Operation & Maintenance Manual

Modulating and condensing boilers
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Modulex Light Commericial Series
CHAPTER 4: Installation Instructions

4.8 BOILER CONNECTIONS

At delivery, the MODULEX EXT boiler is setup with all connections, (i.e. cold/hot water flow &
return, gas, and exhaust outlet) on its RIGHT HAND side.

Changing Exhaust Outlet Location

To move the flue exhaust outlet terminal from the RIGHT HAND side (standard delivery
position) to the REAR position, it is necessary to request the Rear Exhaust kit, which includes a
cover for closing off the RIGHT HAND side panel exhaust opening (see Figure 4-10).
Rear flue
manifold kit
includes the
cover for the
right-hand
exhaust hole.
See Figure
4-10.
Figure 4-9: Rear Exhaust Kit
for
Changing Exhaust Outlet from RIGHT HAND side to
EXT 802, 962, 1123 (only)
REAR on
OMM-0087_J • GF-143 • 11/17/2020
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Page 36 of 150

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