RGM 465, Mfg No. 175758, Page 17
Water Piping
Connections
For additional
information,
consult the
boiler literature.
Supply and Return Connections
140
235
350
500
Supply
1-1/2” 1-1/2”
2”
2”
Return
1-1/2” 1-1/2”
2”
2”
Water Quality
Requirements
Fill Water Requirement
- Water with alkalinity <200 mg/li for initial sys-
tem filling
Makeup Water Requirement
- Water with alkalinity <30 mg/li
System Water Requirements
pH value (@ 77
o
F)................. 9.0 - 10.0
Acid Capacity ........................ 3.0 - 50 mg/li
Oxygen (O
2
) .......................... .01%
Phosphate (P205) .................. 2.5%
Sodium Sulfate (NA2S03) .... 1 - 4%
Water
Controls on
the Boiler
Relief Valve (30 psi)
- The relief valve is installed in the supply manifold. Pipe the relief valve discharge
to a floor drain in accordance with local code requirements.
Pressure and Temperature Gauge
- A gauge that reads both water pressure and temperature is installed
in a special tap in the supply manifold.
Aquastat
- The adjustable aquastat located on the top rear of the boiler controls burner operation to
maintain the temperature of the water in the boiler. The aquastat has a temperature range from 140
o
to
240
o
F. It is recommended that the water temperature be set at 160
o
F or higher. If the application requires
water temperatures below 160
o
F, the use of tempering valves is recommended.
Low-Water Cutoff
- The low-water cutoff switch is a non-adjustable control also located on top of the
boiler. When the boiler and piping are not full of water, the switch will activate (contacts will open) to
shutoff power to the burner.
CAUTION: Water
heated inside this
boiler is not
potable.
Placement of field-
supplied hydronic
accessories as
published by the
boiler manufacturer.
*
The relief valve and
pressure/temperature
gauge are factory-
installed on the supply
manifold.
For overall system protection, it is recommended to install a filter and sludge
removal system in the boiler return piping.
