Install Instructions

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6. Limit Control(s): (Figure 6.5)
a. Install the operating limit control and pressure
gauge in the 3/4" tappings located on the right
side of the boiler.
b. (64-09 through 64-12) Install a high limit control
in the 3/4" tapping on the right side of the boiler.
B. WATER BOILER CONTROLS & TRIM
1. Safety Relief Valve:
a. Pipe the boiler relief valve into the 3/4" tapping
on the left side of the boiler as shown in Figure
6.6. Be sure that the relief valve is sized in
accordance with local code requirements. In
addition, be sure that the relief valve is designed
constructed and stamped in accordance with
ASME Boiler and Pressure Vessel Code,
Section IV.
b. If it is necessary to use a boiler relief valve larger
than 3/4" due to local codes, the relief valve
should be piped in the boiler skim tapping. Do
not increase the pipe size between the
boiler and the valve.
c. Pipe the discharge of the safety relief valve to a
maximum of 12" from the floor. Pipe the relief
outlet close to a floor drain.
CONTROLS & TRIM
Do not install any valves or restrictions between the
relief valve and the boiler. Be sure that the inlet to the
relief valve is the same or smaller pipe size than the
boiler connection.
CAUTION
Pipe the discharge of the relief valve away from any
traffic area. Failure to do this may cause injury if the
valve discharges.
CAUTION
Pipe the discharge of the relief valve using the full
size of the discharge connection.
CAUTION
Figure 6.6: Relief Valve Piping Water Boiler
Figure 6.5: Limit Control Installation
In accordance with Section 325 (f) (3) of the Energy Policy and Conservation Act, water boilers are equipped
with a feature that saves energy by reducing the boiler water temperature as the heating load decreases. This
feature is equipped with an override which is provided primarily to permit the use of an external energy
management system that serves the same function.
THIS OVERRIDE MUST NOT BE USED UNLESS AT LEAST ONE OF THE FOLLOWING CONDITIONS IS TRUE:
• An external energy management system is installed that reduces the boiler water temperature as the heating
load decreases.
• This boiler is not used for any space heating
• This boiler is part of a modular or multiple boiler system having a total input of 300,000 BTU/hr or greater.
• This boiler is equipped with a tankless coil.
IMPORTANT