Weil-McLain GOLD CGt Manual page 20

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
4a
Water piping — general information
General piping information
If installation is to comply with ASME or Canadian
requirements, an additional
needed. Install control in supply piping between boiler
and isolation valve. Set second control to minimum
0°F above setpoint of first control. Maximum allowable
setpoint is 40°F. See Section
A low water cutoff device
installed above radiation level or by certain state or lo-
cal codes or insurance companies. Use low water cutoff
designed for water installations. Electrode probe-type
is recommended. Purchase and install in tee in supply
piping above boiler.
Use backflow check valve
quired by local codes.
If boiler is installed in a closet, it is recommended to
insulate the boiler piping in the closet to lower the closet
air temperature.
Pressure/temperature gauge
Install pressure/temperature gauge in the tee on the
supply piping (as shown in drawing on page 3).
Relief valve
Install relief valve vertically in ¾" tapping on side of
boiler. See
the relief valve for manufacturer's instructions.
Circulator and 3-way valve
1. See page 64, Figure 39.
. Apply pipe dope to fittings and install in boiler
supply and return tappings in the order shown in
Figure 39.
3. Install circulator, flanges and gaskets.
4. Complete by soldering copper fittings and 3-way
valve in the order shown in Figure 39.
5. Pull 3-way valve Molex and harness through jacket
top left conduit opening.
6. Insert Molex connector into mating connector on
3-way valve. Make sure that valve body is in correct
position as shown in Figure 39.
0
high temperature limit
9b for wiring.
is required when boiler is
in cold water supply as re-
Figure 16
, page 1, and the tag attached to
The circulator is shipped loose (wiring pre-attached
to boiler). Pipe the circulator on the return line only,
as shown on page 3 and page 64. Pipe the expansion
is
tank to the suction side of the circulator as shown in
Figure 16, page 1. Install an air separator in the sup-
ply piping. Always install the system fill connection at
the same point as the expansion tank connection to
the system. Figure 16 shows typical near-boiler piping
connections.
To avoid water damage or scald-
ing due to relief valve opera-
tion:
• Discharge line must be connected to relief valve
run to a safe place of disposal
outlet and
minate the discharge line to eliminate possibility
of severe burns should the valve discharge.
• Discharge line must be as short as possible and
same size as the valve discharge con-
be the
nection throughout its entire length.
• Discharge line must
valve and terminate at least 6" above the floor
drain where any discharge will be clearly vis-
ible.
• The discharge line shall
threaded
, with a material serviceable for tem-
peratures of 375°F or greater.
• Do not pipe the discharge to any place where
freezing could occur.
No shutoff valve
•
relief valve and boiler, or in the discharge line.
Do not plug or place any obstruction in the
discharge line.
• Failure to comply
could result in failure of the relief valve to op-
erate, resulting in possibility of severe personal
injury, death or substantial property damage.
Test the operation of the valve
•
pressurizing system by lifting the lever. Make
sure the valve discharges freely. If the valve fails
to operate correctly, replace it with a new relief
valve.
. Ter-
pitch downward
from the
terminate plain, not
shall be installed between the
with the above guidelines
after filling and
Part Number 550-110-290/0107