Operating instructions
Table 3A—Fresh Air Duct Capacities for Vertical Ducts (Btuh)*
100% FREE AREA 75% FREE AREA 25% FREE AREA
Fresh Air
Duct Size (In.)
1/4-in. Mesh
Screen
Metal
Louvers
Wood
Louvers
3" X 12" 144,000 108,000 36,000
8"X8" 256,000 192,000 64,000
8" X 12" 384,000 288,000 96,000
8-1/2" X 16" 512,000 384,000 128,000
* 1 Square Inch per 4,000 Btuh
Table 3B—Fresh Air Duct Capacities for Horizontal Ducts (Btuh)*
100% FREE AREA 75% FREE AREA 25% FREE AREA
Fresh Air
Duct Size (In.)
1/4-in. Mesh
Screen
Metal
Louvers
Wood
Louvers
3" X 12" 72,000 54,000 18,000
8"X8" 128,000 96,000 32,000
8" X 12" 192,000 144,000 48,000
8-1/2" X 16" 256,000 192,000 64,000
* 1 Square Inch per 2,000 Btuh
Table 3C—Fresh Air Duct Capacities for Vertical or Horizontal Ducts (Btuh)*
100% FREE AREA 75% FREE AREA 25% FREE AREA
Fresh Air
Duct Size (In.)
1/4-in. Mesh
Screen
Metal
Louvers
Wood
Louvers
3" X 12" 108,000 81,000 27,000
8"X8" 192,000 144,000 48,000
8" X 12" 288,000 216,000 72,000
8-1/2" X 16" 384,000 288,000 96,000
* 1 Square Inch per 3,000 Btuh
INSTALLATION—SYSTEM PIPING
1. Place boiler in selected location (as close to chimney as possible). Boiler is shipped assembled. Only the relief valve, circulator pump, and
a drain line to carry any water or steam to a drain need to be installed.
2. Install relief valve into 3/4-in. pipe on top of boiler. (See Fig. 2.) Use 3/4-in. pipe and field-supplied elbow to carry water or steam to a
nearby drain. Do not connect directly to a drain but leave an air gap. No shutoff of any description shall be placed between safety relief
valve and boiler, or on any discharge pipes between such safety valves and the atmosphere. Installation of safety relief valve shall conform
to the requirements of the ANSI/ASME Boiler and Pressure Vessel Code, Section IV. The manufacturer is not responsible for any water
damage. Install drain valve in lower left side of boiler as marked.
3. Connect supply and return lines to boiler. The connections may require certain additional fittings and parts. (See Fig. 2 and 3.)
4. This boiler is equipped with 1-1/4 in. supply and return connections on both the left and right sides of boiler.
5. Install factory-supplied circulator pump on supply piping, after expansion tank and before any zone valves. (See Fig. 2.) Route circulator
electrical cable between circulator pump and aquastat and connect cable as shown in Fig. 9 or 10.
In connecting cold water supply to water inlet valve, make sure that a clean water supply is available. When water supply is from a well or pump,
a sand strainer should be installed at pump.
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.
PROCEDURE 1—FOR USE WITH COOLING UNITS
1. This boiler, when used in connection with chilled water systems, must be installed so that chilled water is piped in parallel with the heating
boiler. Appropriate valves must be used to prevent chilled water from entering the heating boiler. (See Fig. 3.)
2. When this boiler is connected to heating coils located in air handling units where they may be exposed to refrigerated air circulation, piping
system shall be equipped with flow control valves or other automatic means to prevent gravity circulation of 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 connected to gas vents or chimneys, vent installations shall be in accordance with Part 7 NFGC, Venting of Equipment, in the United
States or Part 7 NFGC, Venting System and Air Supply for Appliances, in Canada, and applicable provisions of local building codes.
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