IBC Technologies SL 30-175, Инструкция по установке и эксплуатации, Страница: 20 / 78

INSTALLATION AND OPERATION INSTRUCTIONS
1-16
SL 30-175, SL 45-260 MODULATING GAS BOILERS
Water PiPing
1.6.1 General Piping Issues
the sl modulating series boilers are designed for use within a closed loop,
forced circulation, low pressure system. a 30 psi pressure relief valve (3/4" nPt)
is supplied for field installation in the relief valve fitting on top of the boiler. An
automatic air vent is also required - as illustrated - to remove air from the top of
the pressure vessel. relief valve discharge piping must terminate between 6"
(15cm) and 12” (30cm) above the floor or per local Code.
System piping is connected to the boiler using the 1 1/2" NPT-M threaded fittings.
unions and gate or ball valves at the boilers supply and return water connections
are recommended to simplify servicing. un-insulated hot water pipes must be
installed with a minimum 1" clearance from combustible materials.
Fluid fill is most often accomplished by using a boiler regulator & fill valve set
at 12 psig or more, with appropriate backflow prevention device as required
by local code. this is acceptable in areas where municipal water or well water
has been treated and filtered to remove excessive minerals and sediment, and
water chemistry is known to be suitable for closed loop hydronic systems. in
areas where water quality is in question, or when chemical treatment or glycol is
required, other options should be considered. Follow applicable Codes and good
piping practice.
there are a number of boiler feed and pressurization devices on the market
today that may be a better choice than a raw water fill from the mains. When
regular maintenance requires relief valve blow-off, the discharge may be directed
back into the pressurization unit for recycling of boiler fluid and chemicals
back into the system. in buildings that may be unoccupied for long periods of
time, pressurization units are useful to prevent flood damage should leakage
occur from any component in the system. An additional benefit is that backflow
prevention devices are not required when using these devices.
Figure 20: Boiler trim options - Single boiler
CAUTION
Installers should inquire of
local water purveyors as to
the suitability of their supply
for use in hydronic heating
systems.
If water quality is questionable,
a local water treatment expert
must be consulted for testing,
assessment and, if required,
treatment.
Alternatively, water or hydronic
fluid of known quality can be
brought to the site.
WARNING
During operation, the relief
valve may discharge large
amounts of steam and/or hot
water. Therefore, to reduce
the potential for bodily
injury and property damage,
a discharge line MUST be
installed that it:
1. is connected from the valve outlet
with no intervening valve and
directed downward to a safe point of
discharge.
2. allows complete drainage of both the
valve and the discharge line.
3. is independently supported and
securely anchored so as to avoid
applied stress on the valve.
4. is as short and straight as possible
5. terminates freely to atmosphere
where any discharge will be clearly
visible and is at no risk of freezing.
6. terminates with a plain end which is
not threaded.
7. is constructed of a material suitable
for exposure to temperatures of
375°F or greater.
8. is, over its entire length, of a pipe size
equal to or greater than that of the
valve outlet.
DO NOT CAP, PLUG OR OTHERWISE
OBSTRUCT THE DISCHARGE PIPE
OUTLET!
1.6
PRIMARY/BOILER
CIRCULATOR
TO/FROM
LOAD TWO
TO/FROM LOAD ONE
TO/FROM LOAD THREE
FLOW
DIRECTION
FILL AND
EXPANSION
POINT
AIR
ELIMINATOR
“Y”
STRAINER
WITH
DRAIN
SHUT OFF
VALVE
SHUT OFF
VALVE
DIRT
SEPARATOR
WITH DRAIN
OR
IBC
SL 30-175
SL 45-260
BOILER
IBC
GLYCOL FEEDER & SYSTEM
PRESSURIZATION UNIT
OR
EXPANSION
TANK
FRESH
WATER
SUPPLY
SHUT
OFF
VALVE
BACKFLOW
PREVENTER
PRESSURE
REDUCING
VALVE
IMPORTANT NOTE: NONE OF THE
EXTERNAL DEVICES SHOWN ON
THIS DRAWING ARE SUPPLIED BY
IBC AS STANDARD EQUIPMENT
EXCEPT FOR THE PRESSURE
RELIEF VALVE. THE OTHER
DEVICES CAN BE PROVIDED BY
YOUR IBC DISTRIBUTOR OR BY
SPECIAL ORDER FROM IBC
SINGLE BOILER
TRIM OPTIONS