User Guide

ManaBloc Systems
28
PG-PF 724998 0320 PureFlow System
Draining the ManaBloc Unit
If the ManaBloc system has been 󶈵lled with
water and there exists the possibility that
the ambient temperature will drop close
to or below 32°F (0°C), the ManaBloc unit
MUST be drained to prevent irreparable
damage. The process of draining
involves loosening and removal of one
or more supply line connections and two
distribution lines from the ManaBloc.
Note: Depending on the installation,
some supply connections may be
capped. If that is the case, remove the
cap(s) as instructed below.
1. Turn o󶈴 all water supply(s) feeding the
ManaBloc. Open both sides of all 󶈵xtures
served by the manifold and leave the
󶈵xtures open during draining. For each
port of the ManaBloc where there is a
distribution line connected, make sure
the port valve is in the open position.
2. Loosen and remove the bottom supply
connection(s) (or cap(s)) and the lowest
pair of hot and cold distribution lines.
3. As the connections are removed,
most of the water contained in the
ManaBloc main bores and some of
the water in the distribution lines
should purge from the system.
4. Allow to drain until no water purges.
5. Reattach the supply line(s) or cap(s) and
the distribution lines. Tighten the supply
connections according to the instructions
in the PureFlow Water System Installation
Manual. When reconnecting the
distribution lines, DO NOT overtighten
the connections. These only need to be
hand-tight.
Note: This procedure will leave a small
amount of water in the ManaBloc unit and,
depending on the installation, may leave
some or most of the water in the distribution
lines. This remaining water should not cause
damage to the manifold unit or to the PEX
distribution lines in the event of a freeze.
However, for complete assurance that
freeze damage will not occur, perform the
following additional steps.
Draining the ManaBloc System
1. Loosen and remove all of the supply
line connections (or caps) and all
of the distribution lines from the
ManaBloc.
2. Remove the four attachment screws
and withdraw the ManaBloc unit
from its mounting. Note: Grasp the
unit 󶈵rmly before removing the last
attachment screw to prevent the unit
from falling and being damaged.
3. Completely drain the ManaBloc unit
by inverting the unit several times until
there is no water coming from any of
the supply connections or ports.
4. To purge the PEX distribution lines,
󶈵rst make sure that both sides of
all of the 󶈵xtures are in the open
position. Using low-pressure air from
a tank or compressor, force the water
from the lines by connecting the air
pressure source to each line one at
a time and blow air through the lines
until no water 󶈶ows from the 󶈵xtures.
5. Reattach the ManaBloc and
reconnect the supply and distribution
line connections.
Note: When reconnecting the distribution
lines, DO NOT overtighten the
connections. Compression connections
should require only about ⅛ turn past
hand-tight when reinstalling connections
that were previously tightened to the
speci󶈵cations outlined in the installation
guide. PEX Press and PEX Crimp
connections must be only hand-tightened.