A hot water boiler installed above radiation level must be equipped with a low water cut-off device. A periodic inspection is necessary as is flushing
of float-type devices per the manufacturer’s specific instructions.
A 2-in. clearance must be kept between system piping and any combustible material.
PROCEDURE 1—FOR USE WITH COOLING UNITS
When this boiler is used in connection with refrigeration systems, it shall be installed so that the chilled medium is piped in parallel with the heating
boiler. Appropriate valves must be used to prevent the chilled medium from entering the heating boiler. (See Fig. 6.)
When this boiler is connected to heating coils located in air handling units where they may be exposed to refrigerated air circulation, the piping
system shall be equipped with flow control valves or other automatic means to prevent gravity circulation of the boiler water during cooling cycles.
PROCEDURE 2—LOW DESIGN WATER TEMPERATURE SYSTEMS (BELOW 140°F)
If boiler is to be used in a heating system where design water temperatures below 140°F are desired (for example radiant floor heating), a 3-way
or 4-way mixing valve or suitable alternative is required to prevent low temperature return water from entering boiler. Follow mixing valve
manufacturer’s Installation Instructions.
The minimum design return water temperature to boiler to prevent condensation in boiler and venting system is 120°F. The minimum high limit
setting is 140°F.
CHIMNEY AND VENT PIPE CONNECTION
For boilers for connection to gas vents or chimneys, vent installations shall be in accordance with Part 7, Venting of Equipment, of the NFGC ANSI
Z223.1-1992 and applicable provisions of local building codes.
PROCEDURE 1—CHECKING CHIMNEY
This is a very important part of the heating system. It must be clean, the right size, properly constructed, and in GOOD CONDITION. No boiler
can function properly with a bad chimney.
1. Use local codes for installation or NFGC Z.223.1-1992. It is very important to properly size the venting system for induced draft appliances.
Consult the New Vent Sizing Tables, available from A.G.A Laboratories (American Gas Association) or Venting Tables Category I Central
Furnaces, available from G.A.M.A. (Gas Appliance Manufacturers Association) or the NFGC ANSI Z223.1-1992 for correct sizing
information. One of these is probably available from your local supply house, or consult the boiler manufacturer.
2. The categorized vent diameter for these boilers is 4 in. This is the minimum permissible vent diameter in order to maintain a non-positive
vent static pressure. The boiler’s induced draft blower has a 3-in. outlet. A 3-in. X 4-in. increaser fitting is included in the parts bag. Locate
increaser fitting on outlet of induced draft blower and secure gastight with a bead of the factory-supplied silicone sealant.
NOTE: The boiler installation for chimney venting is not complete unless the 3-in. X 4-in. increaser fitting is located and secured.
3. These are high-efficiency boilers with a low stack or exhaust temperature.
4. If venting into masonry chimney without a liner, line chimney from top to bottom with either:
Fig. 6—Piping Arrangements for Boiler Used in Connection with Refrigeration System
A95195
VALVES A & B
OPEN FOR HEATING;
CLOSE FOR COOLING
TO SYSTEM
C
D
WATER
CHILLER
VALVES C & D
CLOSE FOR HEATING;
OPEN FOR COOLING
A
B
—7—
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