Circulators; Hydronic Piping With Circulators, Zone Valves, And Multiple Boilers - Westinghouse WBCETNG750 Manual

16
Expansion tanks must be sized according to total system
volume. This includes all length of pipe, all fixtures, boilers, etc.
Failure to properly size for system expansion could result in
wasted time, money, possible property damage, serious injury,
or death.
Undersized expansion tanks cause system water to be lost from
the relief valve, causing make-up water to be added. Eventual
boiler failure can result due to excessive make-up water
addition. SUCH FAILURE IS NOT COVERED BY WARRANTY.
DO NOT install automatic air vents on closed type expansion
tank systems. Air must remain in the system and return to the
tank to provide an air cushion. An automatic air vent would
cause air to leave the system, resulting in improper operation
of the expansion tank.
Model Heat Exchanger Volume (Gallons)
750
1000
Table 2 - Heat Exchanger Volume
2. The expansion tank must be located as shown in Applications,
this manual, or following recognized design methods. See
expansion tank manufacturer's instructions for details.
3. Connect the expansion tank to the air separator only if the
separator is on the suction side of the circulator. Always install
the system fill connection at the same point as the expansion
tank connection to the system.
4. Most chilled water systems are piped using a closed type
expansion tank.
E. Circulators
DO NOT use the boiler circulator in any location other than
the ones shown in this manual. The boiler circulator location is
selected to ensure adequate flow through the boiler. Failure to
comply with this caution could result in unreliable performance
and nuisance shutdowns from insufficient flow.
SIZING SPACE HEAT SYSTEM PIPING
Size the piping and components in the space heating system
using recognized design methods.
F. Hydronic Piping with Circulators, Zone Valves, and
Multiple Boilers
The boiler is designed to function in a closed loop hydronic
system. The included temperature and pressure gauge allows
the user to monitor system pressure and outlet temperature
from the boiler. It is important to note that the boiler has a
minimal amount of pressure drop that must be calculated when
sizing the circulators. Each boiler installation must have an air
elimination device that will remove air from the system.
Install the boiler so the gas ignition system components
are protected from water (dripping, spraying, etc.). Allow
clearance for basic service of the boiler circulator, valves, and
other components. Observe minimum 1" clearance around all
uninsulated hot water pipes when openings around pipes are
not protected by non-combustible materials.
On a boiler installed above radiation level, some states and
local codes require a low water cut off device. This is provided
WHL-038 Rev. 1.29.16
standard on the boiler. Check with local codes for additional
requirements. If the boiler supplies hot water to heating coils
in air handler units, flow control valves or other devices must
be installed to prevent gravity circulation of boiler water in the
coils during the cooling cycle. Chilled water medium must be
piped in parallel with the boiler.
Freeze protection for new or existing systems must use glycol
specifically formulated for this purpose. This glycol must
include inhibitors that will prevent it from attacking metallic
system components. Make certain that the system fluid is
checked for the correct glycol concentration and inhibitor
level. The system should be tested at least once a year and
as recommended by the producer of the glycol solution.
Allowance should be made for the expansion of the glycol
solution in the system piping. Example: 50% by volume glycol
solution expands 4.8% in volume for the temperature increase
from 32
temperature rise.
38
Never use dielectric unions or galvanized steel fittings when
61
connecting to a stainless steel storage tank or boiler. Failure
to follow this instruction can lead to premature failure of the
boiler system. Such failures ARE NOT covered by warranty.
The boiler should not be operated as a potable hot water
heater. The boiler should not be used as a direct hot water
heating device.
o o
F to 180 F, while water expands 3% over the same