AERCO Esteem O&M Manual - Manual (Page 22)

16
General Piping Requirements
• All plumbing must meet or exceed all local,
state and national plumbing codes.
• Support all piping using hangers. DO NOT
support piping by the unit or its compo-
nents.
• Use isolation valves to isolate system com-
ponents.
• Install unions for easy removal of the
Esteem 399 Low NOx from the system
piping.
WARNING!
U
SE A TWO WRENCH METHOD WHEN TIGHTEN
-
ING PIPING ONTO THE BOILER CONNECTIONS
.
U
SE ONE WRENCH TO PREVENT THE BOILER
PIPING FROM TURNING
/
TWISTING
. F
AILURE
TO SUPPORT THE BOILER PIPING AND CONNEC
-
TIONS IN THIS MANNER COULD CAUSE DAMAGE
TO THE BOILER AND ITS COMPONENTS
.
Pressure Relief Valve
WARNING!
F
AILURE TO COMPLY WITH THE GUIDELINES ON
INSTALLING THE PRESSURE RELIEF VALVE AND
DISCHARGE PIPING CAN RESULT IN PERSONAL
INJURY
,
DEATH OR SUBSTANTIAL PROPERTY
DAMAGE
.
The Esteem 399 Low NOx is supplied with a
30 psi pressure relief valve and must be piped
using the PRV connection as shown in Figure
6, page 17.
To avoid potential water damage to the sur-
rounding area or potential scalding hazard
due to the operation of the relief valve, the
discharge piping:
• Must be connected to the discharge outlet
of the relief valve and directed to a safe
place of disposal.
• Length should be as short and direct as
possible. The size of the discharge line
should not be reduced, maintain the same
size as the outlet of the relief valve.
• Should be directed downward towards the
floor at all times. The piping should termi-
nate at least 6 inches [153 mm] above any
drain connection to allow clear visibility of
the discharge.
• Should terminate with a plain end, not with
a threaded end. The material of the piping
should have a serviceable temperature rat-
ing of 250ºF or greater.
• Should not be subject to conditions where
freezing could occur.
• Should not contain any shut-off valves or
obstructions. No shut-off valve should be
piped between the boiler and relief valve.
Low Water Cutoff Device
• The Esteem 399 Low NOx is equipped with
a factory installed pressure switch type Low
Water Cut Off device.
• The minimum operating system pressure
allowable with this device is 10 psig.
• Check local codes if a Low Water Cutoff
Device is required. If so, determine if this
device meets the requirements of the local
codes.
WARNING!
T
HE
E
STEEM
399 L
OW
NO
X CONTROL SYSTEM
SENSES THE SYSTEM WATER TEMPERATURES
ENTERING AND EXITING THE HEAT EXCHANGER
TO PROVIDE PROTECTION AGAINST LOW WATER
CONDITIONS
W
HERE LOCAL CODES AND JURIS
-
DICTION DO NOT ACCEPT A PRESSURE DEVICE
FOR LOW WATER PROTECTION
,
THEY MAY AC
-
CEPT THESE INTEGRAL CONTROL FUNCTIONS AS
A MEANS OF PROVIDING LOW WATER PROTEC
-
TION
.
Chapter 5 Boiler Piping
GF-125