Recommended Piping For Combination; Heating & Cooling (Refrigeration) System - Burnham Revolution Installation, Operating And Service Instructions

E.
Space heating and domestic water heating with
Alliance™ water heater. Install Alliance water heater as
a separate heating zone. Refer to Alliance Installation,
Operating and Service Instructions for additional
information.
F.
If boiler is used in connection with refrigeration
systems, boiler must be installed with chilled medium
piped in parallel with the heating boiler using appropri-
ate valves to prevent chilled medium from entering
boiler, see Figure 27. Also consult I=B=R Installation
and Piping Guides.
G.
If boiler is connected to heating coils located in air
handling units where they may be exposed to refriger-
ated air, boiler piping must be equipped with flow
control valves to prevent gravity circulation of boiler
water during operation of cooling system.
H.
A hot water boiler installed above radiation level
must be provided with a low water cutoff device as part
of installation.
I
. If a low water cutoff is required, it must be mounted
in the system piping above the boiler. 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 : Recommended Piping for Combination
Heating & Cooling (Refrigeration) System
J.
Oil, grease, and other foreign materials which
accumulate in new hot water boilers and a new or
reworked system should be boiled out, and then
thoroughly flushed. A local qualified water treatment
chemical specialist is a suggested source for recommen-
dations regarding appropriate chemical compounds and
concentrations which are compatible with local
environmental regulations.
K.
After the boiler and system have been cleaned and
flushed, and before refilling the entire system add
appropriate water treatment chemicals, if necessary, to
bring the pH between 7 and 11.
L.
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 air
trapped in the boiler.
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.
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