23
Cast Iron Condensing Boilers – Installation Manual
FlexCore Stainless Steel Condensing Boilers – Installation Manual
DOMESTIC WATER SUPPLY PIPING
Proper controls must be used to prevent
water supplied for domestic use from
exceeding 130°F, 54°C or a scald injury will
occur! When higher water temperatures are
required for appliances such as a dish-
washer, a mixing valve or some other
tempering means must be installed.
Households with small children may require
water temperatures less than 120°F, 49°C.
Local codes must be complied with!
General Piping Requirements
The FlexCore boiler can be use in combination with an
indirect tank to provide hot water for domestic use. Piping
and components must be suitable for use with potable
water. The indirect storage tank must be equipped with
a temperature and pressure relief valve that complies
with ANSI Z21.22 or CAN-4.4 and CAN-4.6.
The storage tank must be located as close to
the boiler as possible to prevent excessive
head loss which will reduce flow.
Expansion Tank
An expansion tank or other means to control thermal
expansion must be installed in the water heating system
if back flow prevention devices are installed.
Two typical water heating systems are shown in Figures
14 & 15.
Thermostatic Mixing Valve- Water Above 140°F, 60°C
Water can be stored a temperatures above 140°F,
60°C provided that a thermostatically controlled mixing
valve is used to temper the hot water to an acceptable
temperature before it's supplied for domestic use. The
mixing valve MUST be set to prevent a scald injury from
occurring, see the caution against scalding above.
Storage of water for domestic use above 140°F, 60°C
will provide an increased quantity of tempered water and
help prevent the growth of water born bacteria.
Figure 14 - Typical Single Boiler with Indirect Storage Tank Piping
RIOM-0206_A
HEAT NET
SENSOR
EXPANSION
TANK
THERMOMETER
BACKFLOW PREVENTION
DEVICE
GATE VALVE
PUMP
TEMPERATURE &
PRESURE
RELIEF VALVE
PRESURE
RELIEF VALVE
CHECK VALVE
VACUUM RELIEF
VALVE
NOTICE: THESE DRAWINGS SHOW SUGGESTED PIPING CONFIGURATION, VALVING AND ARE
DIAGRAMMATIC. CHECK WITH LOCAL CODES AND ORDINANCES FOR SPECIFIC REQUIREMENTS.
BRONZE
PUMP
4
2
1
4
CIRCULATOR
RETURN
FLOW
COLD WATER
MAKE-UP
FLOW
FLOW
2
COLD WATER
MAKE-UP
SUPPLY
NOTES:
1. WHEN USING INTERMITTENT PUMP AND PUMP DELAY, LOCATE HEAT NET SENSOR WITH
WELL IN LOWER 1/3 OF TANK. INSTALL SENSOR WITH HEAT SENSING COMPOUND.
2. THERMAL EXPANSION TANK MAY BE REQUIRED, CHECK LOCAL CODES.
3. HOT WATER TANK SHOULD BE EQUIPPED WITH A COMBINATION TEMPERATURE &
PRESSURE RELIEF VALVE. VALVE SHALL DISCHARGE TO A SAFE PLACE WITH AN
AIR GAP. REFER TO LOCAL CODES.
4. MA CODE REQUIRES AN 1/8" HOLE IN CHECK VALVES TO COMPENSATE FOR THERMAL
EXPANSION.
5. CONTRACTOR SHALL VERIFY, WITH AUTHORITY HAVING JURISDICTION, FOR THE
REQUIREMENTS OF AN ACID NEUTRALIZATION KIT.
6. A THERMOSTATIC MIXING VALVE MAY BE REQUIRED AT THE OUTLET OF THE TANK IN
ORDER TO LIMIT THE MIXED WATER TO A DESIRABLE TEMPERATURE HELPING TO
PREVENT SCALDING AND INJURY. CONSULT LOCAL CODES.
3
RIOM-0206_A
HEAT NET
SENSOR
EXPANSION
TANK
THERMOMETER
BACKFLOW PREVENTION
DEVICE
GATE VALVE
PUMP
TEMPERATURE &
PRESURE
RELIEF VALVE
PRESURE
RELIEF VALVE
CHECK VALVE
VACUUM RELIEF
VALVE
NOTICE: THESE DRAWINGS SHOW SUGGESTED PIPING CONFIGURATION, VALVING AND ARE
DIAGRAMMATIC. CHECK WITH LOCAL CODES AND ORDINANCES FOR SPECIFIC REQUIREMENTS.
BRONZE
PUMP
4
2
1
4
CIRCULATOR
RETURN
FLOW
COLD WATER
MAKE-UP
FLOW
FLOW
2
COLD WATER
MAKE-UP
SUPPLY
NOTES:
1. WHEN USING INTERMITTENT PUMP AND PUMP DELAY, LOCATE HEAT NET SENSOR WITH
WELL IN LOWER 1/3 OF TANK. INSTALL SENSOR WITH HEAT SENSING COMPOUND.
2. THERMAL EXPANSION TANK MAY BE REQUIRED, CHECK LOCAL CODES.
3. HOT WATER TANK SHOULD BE EQUIPPED WITH A COMBINATION TEMPERATURE &
PRESSURE RELIEF VALVE. VALVE SHALL DISCHARGE TO A SAFE PLACE WITH AN
AIR GAP. REFER TO LOCAL CODES.
4. MA CODE REQUIRES AN 1/8" HOLE IN CHECK VALVES TO COMPENSATE FOR THERMAL
EXPANSION.
5. CONTRACTOR SHALL VERIFY, WITH AUTHORITY HAVING JURISDICTION, FOR THE
REQUIREMENTS OF AN ACID NEUTRALIZATION KIT.
6. A THERMOSTATIC MIXING VALVE MAY BE REQUIRED AT THE OUTLET OF THE TANK IN
ORDER TO LIMIT THE MIXED WATER TO A DESIRABLE TEMPERATURE HELPING TO
PREVENT SCALDING AND INJURY. CONSULT LOCAL CODES.
To Next Page
Loading...
