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K.
BOILER PIPING - HEATING APPLICATIONS
CONNECT SUPPLY AND RETURN PIPING TO
HEATING SYSTEM
Connect supply and return piping to heating system
(see Figures 23 through 28). Flow direction for hot
water boilers must be from the rear return out through
the top front supply. Some boiler sizes may require the
use of additional supply and return tappings. Check
Figure 21 and applicable piping diagram for the boiler
size you are installing.
Failure to properly pipe boiler may result in improper,
unsafe system operation and void manufacturer's
warranty.
DO NOT improperly pipe boiler.
Le fait de ne pas raccorder correctement la chaudière
peut entraîner un fonctionnement incorrect et dangereux
du système et annuler la garantie du fabricant. NE PAS
canaliser la chaudière de manière incorrecte.
All hot water pipes must have clearances of at least
1/2" from all combustible construction.
Tous les tuyaux de chaude doivent avoir un dégagement
d'au moins 1/2 po de toute construction combustible.
A hot water boiler installed above radiation level must
be provided with a low water cutoff device as part of
the installation.
Une chaudière à eau chaude installée au-dessus
du niveau de rayonnement doit être équipée d'un
dispositif de coupure de bas niveau d'eau dans le
cadre de l'installation.
1. HOT WATER HEATING - This boiler must be
installed in strict accordance with this installation
manual Deviations from these installation
instructions may void manufacturer's warranty.
Continued boiler operation for prolonged periods of
time under conditions when temperature differential
across the system exceeds 40°F and/or, return
water temperature stays below 135°F, may result in
premature boiler failure due to flue gas condensation
and/or thermal shock.
34
Le fonctionnement continu de la chaudière pendant
des périodes prolongées dans des conditions
où la différence de température dans le système
dépasse 40 ° F et / ou, la température de l'eau de
retour reste inférieure à 135 ° F, peut entraîner une
défaillance prématurée de la chaudière en raison de la
condensation des gaz de combustion et / ou d'un choc
thermique.
a. If the boiler is used in connection with
refrigeration systems, boiler must be installed
with chilled medium piped in parallel with
heating boiler using appropriate valves to
prevent chilled medium from entering boiler.
See Figure 30.
b. If the boiler is connected to heating coils
located in air handling units where they may be
exposed to refrigerated air, boiler piping must
be equipped with flow control valves to prevent
gravity circulation of boiler water during cooling
system operation.
c. Burnham Commercial recommends maintaining
temperature differential (drop) across the system
at 40°F or less, and return water temperature at
minimum of 135°F for optimum operation and
long-term reliability.
If minimum return water temperature can
i.
be maintained at 135°F and temperature
differential across the system is at 40°F
or less, refer to Figure 26 or 27 for
recommended minimum boiler piping
details.
ii. If minimum return water temperature cannot
be maintained at 135°F or the temperature
differential across the system varies, a blend
pump is recommended as a minimum to help
protect the boiler from flue gas condensation
and/or thermal shock. See piping details in
Figure 25. Primary secondary piping with
a by-pass is an alternate to the blend pump
method and is shown in Figure 26.
d. If conditions exist where the boiler is subjected
to prolonged periods of operating conditions
below 135°F, other mixing methods such as three
or four way valves or variable speed injection
should be used.
e. Multiple Boilers - Recommended minimum
multiple boiler piping is shown in Figure 27 as
primary secondary with a by-pass. The boiler
circulator will maintain a constant flow through
the boiler during every heat demand while the
by-pass diverts a portion of hot water back to the
return. Alternate minimum multiple boiler piping
is shown in Figure 28. The blend pump will
maintain constant flow through the boiler during
every heat demand and provide a hot water blend
back to the return.
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