Installation, Operation & Maintenance Manual

18
CONTROLS & TRIM
A. 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
6.1. 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 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.
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. Pressure/Temperature Gauge:
Install the pressure/temperature gauge (theraltimeter)
supplied with the boiler into the 1/2" tapping located
on the right side of the boiler. Refer to Figure 6.2 for
tapping location.
4. Limit Control(s):
a. Install the operating limit control provided in the
3/4" tapping located on the right side of the
boiler. Refer to Figure 6.2 for tapping location.
b. (64-09 through 64-12) Install a high limit control
in the 3/4" tapping located above the operating
limit control. Refer to Figure 6.2 for location.
5. Low Water Cut-off (Level Control)
a. A hot water boiler installed above radiator level
or as required by the authority having jurisdiction
must be provided with a low water cut-off device
either as part of the boiler or at the time of
installation.
b. If a probe-type low water cut-off is used it should
be piped into the boiler supply piping as shown
in Figure 6.3.
6. 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 6.2 Water Boiler Tapping Locations
Figure 6.1 Relief Valve Piping Water Boiler
Figure 6.3 Probe Low Water Cut-off Piping