STEP 3: INSTALLING HYDRONIC COMPONENTS

A low-water cutoff must be installed to protect the unit from dry-fire.

Screw extension nipple into 3/4" tapping on top of the absorption unit and install relief valve into top of nipple with the spindle in the vertical position (i.e., with the valve discharge in the horizontal)(See Figure 2.4).

WARNING: No Valve of any type may be installed between the boiler and the relief valve to prevent accidental explosion from overpressure.

Most localities require the discharge piping to terminate within 6" of the floor. Check local code requirements if in doubt. Discharge piping must be of same size or larger than the relief valve outlet and should be run as short and straight as possible. Elbows in the discharge piping should be placed as close to the valve as possible. If valve discharge is to be drained away, the discharge piping must not be hard-piped to the drain piping (i.e., an open funnel or similar arrangement must be used).

CAUTION: Piping must be installed from the relief valve discharge so there will be no danger of scalding personnel.

PRESSURE

RELIEF VALVE

PRESSURE RELIEF

VALVE DISCHARGE

PIPING

FIGURE 2.4

STEP 4: VENTING BOILER

DANGER: Drafthood, vent outlet and vent damper as supplied must not be altered in any was as proper boiler operation would be jeopardized. Flame rollout, fire or carbon monoxide poisoning will result.

Install draft hood on boiler. If the draft hood shroud has a hole near the relief opening for installing a spill switch, mount draft hood so the hole faces to the front of the boiler. Spill switches are provided on Model GB250-5L,

GB250-5H, and GB250-6 boilers.

Applicable boiler is equipped with a factory-mounted spill switch harness/mounting bracket assembly; spill switch is provided in plastic bag. See Figure 2.5. Install mounting bracket on outside surface of draft hood shroud with screws provided (HARNESS MUST BE ON OUTSIDE OF SHROUD). Install spill switch in hole in shroud (on outside surface) with screws provided. Plug wiring leads from harness/bracket assembly onto flat terminals on spill switch.

NOTE: Boiler will not operate unless wiring leads to spill switch are connected.

INSTALL

 

CONNECT

 

 

 

INSTALL

SWITCH

WIRE

 

 

MOUNTING

IN OPENING

LEADS

 

 

 

BRACKET

ON DRAFTHOOD

 

 

 

 

 

 

 

 

 

 

ON DRAFTHOOD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FIGURE 2.5

If vent damper is supplied with boiler, it must be installed between the top of the draft hood and the flue pipe. See “Installing The Vent Damper” instructions.

Connect draft hood to chimney or Class B vent. Flue pipe must be same diameter as the draft hood outlet.

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