Install Instructions

19
CONTROLS & TRIM
A. STEAM BOILER CONTROLS & TRIM
1. Safety Valve:
a. Pipe the boiler safety valve provided into the 3/4"
tapping on the left side of the boiler as shown in
Figure 6.1. Be sure that the relief valve is sized in
accordance with local code requirements. In
addition, be sure that the safety valve is designed
constructed and stamped in accordance with the
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 valve to a
maximum of 12" from the floor. Pipe the outlet
close to a floor drain.
2. Drain Valve:
Install the 3/4" drain valve provided into the drain
tapping on the right hand side of the boiler. Refer to
Figure 6.2 for tapping location.
3. Low Water Cut-off (Level Control):
a. Float Type: Install the float type low water cut-
off (if provided) in conjunction with the gauge
glass as shown in Figure 6.3.
b. Probe Type: Install the optional probe type low
water cut-off into the 3/4" tapping on the right
side of the boiler. Refer to Figure 6.2 for tapping
location. The supplied control incorporates a 60
second off cycle after a 15 minute on cycle. This
feature allows the water level in the boiler to settle
so that the probe can sense a true water level.
4. Gauge Glass:
a. Install the gauge glass provided into two 1/2"
tappings on the right side of the boiler. If a float
type low water cut-off is used, it will be piped
into these same fittings. See Figure 6.3 and 6.4
for examples of this installation.
5. Pressure Gauge:
a. Install the operating limit control and pressure
gauge in the 3/4" tappings located on the right
side of the boiler. Refer to Figure 6.2 for tapping
location.
6. CONTROLS & TRIM
Figure 6.3: Gauge Glass & Low Water Cut-Off
Installation
Figure 6.2: Steam Boiler Tapping Location
Figure 6.1
Figure 6.4: Gauge Glass Installation