Lochinvar SBT 050 Installation Manual
INSTALLATION INSTRUCTIONS
FOR STAINLESS STEEL HYDRONIC BUFFER TANK
FOR MODELS: SBT 030, 050, 080 & 119
INS70069 Rev A
Dimensions and Specifications
Model
Number
Gallon
Capcity
A B
C D E F
Supply/
Return
Boiler
Tappings
SBT030
30
7 3/4" 11 3/4"
20 3/16" 28 11/16" 39 1/4" 20 1/8" 1 1/4" 1 1/4"
SBT050
50
8 13/16" 14 13/16"
24 3/16" 33 5/8" 47" 24 1/8" 1 1/4" 1 1/4"
SBT080
80
8 13/16" 14 13/16"
35 1/4" 55 11/16" 69 1/8" 24 1/8" 1 1/2" 1 1/2"
SBT119 119 9" 15"
34 9/16" 54 1/8" 67 15/16" 28 1/8" 1 1/2" 1 1/2"
Figure 1 Buffer tank dimensions, refer to table below
• Hydronic buffer tanks are built with four (4) connections. Two
(2) connections can be piped to the heating appliance and two
(2) can be piped to the distribution system. If piped correctly
the buffer can serve as a hydraulic separator as well as a thermal
buffer. The heating appliance is therefore de-coupled from the
distribution system. Reference the piping diagrams on pages 2
and 3 of this instruction sheet.
• The buffer tank is also supplied with a 1" NPT vent connection,
3/4" drain opening, and a 3/8" sensor bulbwell. This bulbwell is
designed to accommodate sensors supplied with the boilers or a
Honeywell Aquastat control (TST20016) which can be ordered
from your Lochinvar distributor.
• The buffer tanks are made of 316 stainless steel, insulated with
foam and wrapped in Polypropylene / ABS outer jacket.
Application
The primary application of a buffer tank is to reduce boiler or heat
pump cycling. Hydronic buffer tanks are designed to be used in
systems operating below the designed load conditions, or in systems
having several low BTU heating loads calling at different times.
Short cycling can result in reduced operating
efficiency which shortens the life of the
appliance.
NOTICE
DO NOT use in potable water systems.
WARNING
Use this vessel only in hydronic heating systems.
The installer must comply with all plumbing
codes. DO NOT operate above the temperature
or pressure specified on the rating plate. Failure
to comply may result in personal injury,
property damage, or death.
WARNING
1” NPT VENT CONNECTION
(ALL MODELS)
TO BUILDING LOOP
HEAT SOURCE
FROM BUILDING
LOOP
"E"
"D"
"C"
"B"
"A"
"F"
FROM
BULBWELL
TO
HEAT SOURCE
3/4” NPT DRAIN
AIR
SEPARATOR
MAKE UP WATER
HOT
WATER
OUT
COLD
WATER
IN
BUFFER
TANK
AIR VENT
DRAIN
RECIRCULATION
PUMP
CHECK VALVE
RELIEF VALVE
ZONE #1
ZONE #4
ZONE #3ZONE #2
SYSTEM
SUPPLY SENSOR
(WHEN USED)
EXPANSION
TAN K
BALL VALVE
(TYPICAL)
TEMPERATURE /
PRESSURE GAUGE
BOILER 2
(MEMBER 1)
BOILER 1
(LEADER)
DRAIN
(TYPICAL)
UNION
(TYPICAL)
Y-STRAINER
(RECOMMENDED)
(TYPICAL)
BOILER
CIRCULATOR
PRESSURE
GAUGE
PRESSURE
REDUCING VALVE
BACKFLOW
PREVENTER
FLOW CHECK
VALV E
(TYPICAL)
DOMESTIC
HOT WATER
CIRCULATOR
ANTI-SCALD
MIXING VALVE
INDIRECT
DHW TAN K
2 of 4
INS70069 Rev A
Figure 2 Single heater with zoned with circulators
BOILER
INDIRECT
DHW TANK
COLD
WATER
IN
AIR SEPARATOR
DRAIN
MAKE UP
WATER
HOT
WATER
OUT
BUFFER
TANK
AIR VENT
RECIRCULATION
PUMP
CHECK VALVE
CHECK VALVE
DRAIN
ZONE #1 ZONE #4ZONE #3ZONE #2
SYSTEM
SUPPLY SENSOR
(WHEN USED)
EXPANSION
TAN K
FLOW CHECK
VALVE
(TYPICAL)
ZONE
CIRCULATORS
(TYPICAL)
PRESSURE
GAUGE
PRESSURE
REDUCING VALVE
BACKFLOW
PREVENTER
BOILER
CIRCULATOR
Y-STRAINER
RECOMMENDED
TEMPERATURE /
PRESSURE
GAUGE
FLOW
CHECK VALVE
DOMESTIC
HOT WATER
CIRCULATOR
ANTI-SCALD
MIXING VALVE
Figure 3 Multiple heaters zoned with circulators
Loading...