Operating instructions

D. Connecting 115–V Electrical Wiring to Boiler
Connect 115-v electric supply wires to terminals L1 and L2 on aquastat relay. (See Fig. 14.)
E. Thermostat Connections
The 2 wires from thermostat connect to terminals T and T on L8148A and L8124C aquastat relay (See Fig. 14.)
F. Thermostat Heat Anticipator Adjustment
Set heat anticipator at 0.2 amps. Measure the AMP draw of the thermostat circuit and adjust the anticipator setting if necessary.
PROCEDURE 7—EQUIPMENT AND OPTIONAL ACCESSORIES
A. Relief Valve (Required, Provided)
Each low-pressure hot water heating boiler is provided with a relief valve for over-pressure protection of boiler and heating system. The relief valve
opens when pressure in boiler rises to 30 psig. Each relief valve is provided with a lifting device for testing and should be tested monthly during
heating season. Escape piping should be provided from discharge side of relief valve so as to prevent scalding or other hazardous situations. The
escape piping must remain full size and end at a safe point of discharge.
B. Expansion Tank (Not Provided)
In a properly assembled system, expanding water flows into an expansion tank. This tank should be of the correct size.
The tank is filled with air. As the water expands, it compresses the air in tank to form an air pressure cushion. This ″spring-like″ cushion serves
to maintain correct operating water pressure regardless of water temperature. This assures a ″full measure″ of water even in the highest radiation
unit of system. It also prevents blowing off the relief valve.
The air in tank in the beginning (with system filled with cold water) is sufficient for proper operation. The tank also serves as a trap for excess
air in system. This air would cause gurgling in pipes and inefficient circulation in radiators if left in system.
It is possible for a tank to become ″water-logged″ (filled with water). It can also become overfilled with air. This can happen after filling system
with new water. Fittings are provided on tank and in line to tank for bleeding off excess water or air.
When installing this tank, the following are important:
1. Tank should be higher than boiler top.
2. Pipe to tank should continuously rise up to tank (so that air can ″bubble″ up through it).
Fig. 12—Typical Chimney Requirements
A95601
MUST BE REQUIRED MINIMUM
HEIGHT. MUST BE AT LEAST
3 FT HIGHER THAN HIGHEST
PART OF PASSAGE THROUGH
ROOF. MUST BE AT LEAST 2 FT
HIGHER THAN ANY NEIGHBORING
OBJECT. MUST HAVE AN
UNOBSTRUCTED TOP OPENING.
MUST BE AT LEAST
4 IN. THICK AND BE TIGHT.
BALANCED
WEIGHT
CRIMPED
END
ALTERNATE POSITIONS
TOP
TOP
MUST SLOPE UP AT
LEAST
1
/4 IN. PER FOOT
OF HORIZONTAL RUN.
TIGHT CLEAN-OUT
DOOR
SEALED IN
THIMBLE
TIGHT, SMOOTH,
CORRECTLY SIZED.
DRAWBAND LAST
PIECE INSTALLED
DRAFT REGULATOR
VANE
—12—