Domestic Water Supply Piping - RBI Series 8800 Installation And Operation Manual

Page 10
Multiple Boiler Systems
Systems using multiple boilers can also be installed
using a primary/secondary manifold system, Figure 3.
Piping For Use With Cooling Units
The boiler, when used in connection with a refrigeration
system, must be installed so the chilled medium is piped
in parallel with the boiler. Appropriate valves must be
used to prevent the chilled water from entering the
boiler, see Figure 4.
Figure 4 - Chilled Medium Piping
FOR HEATING: VALVES "H" OPEN, VALVES "C" CLOSED.
FOR COOLING: VALVES "H" CLOSED, VALVES "C" OPEN.
EXP. TANK
RELIEF
VALVE
FILL
VALVE
DRAIN
BOILER
When a boiler is connected to a heating coil that may
be exposed to refrigerated air from an air handling
device, the piping system must be equipped with flow-
control valves or some other automatic means of
preventing gravity circulation of the boiler water during
the cooling cycle.
SERIES 8800 & 8900 INSTALLATION AND OPERATING INSTRUCTIONS
NOTE
VENT
H
C
PUMP
C
H
CHILLER

DOMESTIC WATER SUPPLY PIPING

CAUTION: Proper controls must be used to prevent
water supplied for domestic use from exceeding
130°F (54°C) or a scald injury will occur! When
higher water temperatures are required for
appliances such as a dishwasher, a mixing valve or
some other tempering means must be installed.
Households with small children may require water
temperatures less than 120 °F (49°C). Local codes
must be complied with!
General Piping Requirements
Ensure that the water heater is equipped with bronze
headers. Piping and components connected to the water
heater must be suitable for use with potable water. The
ROOM
UNIT
water heater must not be connected to any heating
system piping or components previously used with a
non-potable water heating appliance. Toxic chemicals,
such as those used for boiler treatment, are not to be
introduced into any potable water used for space
heating. If a hot water storage tank is used in the system
it must be equipped with a temperature and pressure
relief valve that complies with ANSI Z21.22 or CAN-4.4
DRAIN
and CAN-4.6.
NOTE: The storage tank must be located as close
to the water heater as possible to prevent excessive
head loss which will reduce flow.
Water Chemistry
The required temperature rise across the water heater
is based on water having a hardness between 8 and
18 grains per gallon with a level of dissolved solids not
exceeding 350 ppm. Water having a hardness less than
8 grains can cause excessive corrosion of the heat
exchanger. Water that has a hardness greater than 18
grains per gallon and/or a level of dissolved solids
exceeding 350 ppm will require a recalculation of the
pump size and temperature rise. A Cupro-Nickel heat
exchanger may also be required. The manufacturer
should be consulted when these water conditions are
encountered.