Product Overview

23
103859-12 - 8/19
MPO-IQ
Installation & Service Manual
5. See Figure 12 for suggested near boiler piping of
Option Card Controls.
WARNING
The use of a low water cut-off device, while not
required unless radiation level is below the boiler,
is highly recommended.
If a low water cut-off is required, it must be mounted
in the supply piping above the boiler (see Figure
12). The minimum safe water level of a hot water
boiler is just above the highest water containing
cavity of the boiler; that is, a hot water boiler must
be full of water to operate safely.
Figure 12: Near Boiler Piping
It is recommended that the LWCO control is installed
above the boiler to provide the highest level of
protection. However, where the LWCO control is
approved by the LWCO control manufacturer for
installation in a high boiler tapping of a water boiler,
the use of the listed LWCO control is permitted when
it is installed according to the LWCO manufacturer's
instructions.
6. If it is required to perform a long term pressure test
of the hydronic system, the boiler should first be
isolated to avoid a pressure loss due to the escape
of trapped air.
To perform a long term pressure test including the
boiler, ALL trapped air must first be removed from
the boiler.
A loss of pressure during such a test, with no
visible water leakage, is an indication that the boiler
contained trapped air.
3 Water Boiler Piping (continued)
!