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Hydronic Piping - General
•
Install piping in accordance with authority having juris-
diction.
•
Support system piping and safety relief valve discharge
piping.
Special Conditions
•
System piping exposed to freezing conditions: Use
inhibited proplyene glycol solutions certifi ed by fl uid
manufacturer for use with closed water heating system.
Do not use automotive or ethylene glycol.
•
Boiler installed above radiation level (or as required by
authority having jurisdiction). Install low water cutoff.
•
Boiler used in connection with refrigeration system.
Install piping in parallel with boiler, with appropriate
valves to prevent chilled medium from entering boiler.
See Figure 2.
•
System piping connected to heating coils located in air
handling unit exposed to refrigerated air circulation.
Install fl ow control valves or other automatic means to
prevent gravity circulation of boiler water during cooling
cycle.
Safety Relief Valve
Boiler rated at 100 psig maximum allowable
working pressure. Boiler provided with 30
psig safety relief valve. Field source safety
relief valve for system pressures greater
than 30 psig. Temperature-Pressure Gauge
provided with boiler is satisfactory for 30-50
psig operation. Replace Temperature-Pressure
Gauge for system pressure over 50 psig. Scale
on dial must be graduated to not less than
1½ nor more than 3½ time safety relief valve
pressure settings.
•
Install safety relief valve and air vent using pipe fi ttings
provided with boiler. See fi gure on page 3.
•
Install safety relief valve with spindle in vertical position.
•
Do not install shutoff valve between boiler and safety
relief valve.
•
Systems with automatic fi ll valves require back fl ow
prevention device.
•
Install discharge piping from safety relief valve. See
Figure 1.
•
Use ¾" or larger pipe.
•
Use pipe suitable for temperatures of 375°F (191°C)
or greater.
CONNECTING SUPPLY & RETURN PIPING
NOTICE
•
Individual boiler discharge piping shall be
independent of other discharge piping.
•
Size and arrange discharge piping to avoid reducing
safety relief valve relieving capacity below minimum
relief valve capacity stated on rating plate.
•
Run pipe as short and straight as possible to location
protecting user from scalding and properly drain
piping.
•
Install union, if used, close to safety relief valve
outlet.
•
Install elbow(s), if used, close to safety relief valve
outlet and downstream of union (if used).
•
Terminate pipe with plain end (not threaded).
•
When boiler is connected to heating system utilizing
multiple zoned circulators, each circulator must be
supplied with fl ow control valve to prevent gravity
circulation.
•
Hot water boilers and system must be fi lled with water
and maintained to minimum pressure of 12 p psig.
•
Bypass piping is an option which gives ability to adjust
the supply boiler water temperature to fi t the system or
condition of installation. This method of piping, however,
is not typically required for baseboard heating systems.
Typical installations where bypass piping is used are as
follows:
A.
This method is used to protect boilers from
condensation forming due to low temperature
return water. Generally noticed in large converted
gravity systems or other large water volume
systems. Figure 3.
B.
These methods are used to protect systems using
radiant panels and the material they are encased
in from high temperature supply water from the
boiler and protect boiler from condensation.
NOTE#1: When using bypass piping, adjust valves V1 & V2
until desired system temperature is obtained.
NOTE#2: Bypass loop must be same size piping as the
supply and return piping.
•
Installation using circulators and zone valves are shown
in Figures 3-8. For further piping information refer to
I=B=R Installation and Piping Guide
Burn and scald hazard. Safety relief valve
!
could discharge steam or hot water during
operation. Install discharge piping per these
instructions.
6
.
WARNING
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