HTP Mod Con 300 HL User Manual

18
To avoid water damage or scalding due to relief valve operation:
• Discharge line must be connected to relief valve outlet and run to a safe place of disposal.
• Terminate the discharge line in a manner that will prevent possibility of severe burns or property
damage should the relief valve discharge.
• Discharge line must be as short as possible and the same size as the valve discharge connection
throughout its entire length.
• Discharge line must pitch downward from the valve and terminate at least 6” above the floor
drain, making discharge clearly visible.
• Discharge line shall terminate plain, not threaded, with a material serviceable for temperatures of
375
o
F or greater.
• Do not pipe discharge to any location where freezing could occur.
• No shutoff valve may be installed between the relief valve and boiler or in the discharge line. Do
not plug or place any obstruction in the discharge line.
• Test the operation of the relief valve after filling and pressurizing the 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.
• Test relief valve at least once annually to ensure the waterway is clear. If valve does not operate,
turn the boiler “off” and call a plumber immediately.
• Take care whenever operating relief valve to avoid scalding injury or property damage.
• For boilers installed with only a pressure relief valve, the separate storage vessel must have a
temperature and pressure relief valve installed. This relief valve shall comply with Relief Valves
for Hot Water Supply Systems, ANSI Z21.22 CSA4.4
•
FAILURE TO COMPLY WITH THE ABOVE GUIDELINES COULD RESULT IN FAILURE OF RELIEF
VALVE OPERATION, RESULTING IN POSSIBILITY OF SUBSTANTIAL PROPERTY DAMAGE,
SEVERE PERSONAL INJURY, OR DEATH.
C. BACKFLOW PREVENTER
Use a backflow preventer specifically designed for hydronic boiler installations. This valve should be
installed on the cold water fill supply line per local codes (see Boiler Piping Details, Part 4, Section G).
All piping methods shown in this manual use primary/secondary connection to the boiler loop. This is to
avoid the possibility of inadequate flow through the boiler. For other piping methods, consult your local
HTP representative, or refer to Boiler Piping Details in this manual, Part 4, Section G.
D. SYSTEM WATER PIPING METHODS
EXPANSION TANK AND MAKE-UP WATER
1. Ensure that the expansion tank is sized to correctly handle boiler and system water volume and
temperature.
BOILER WATER VOLUME
300
2.9 Gallons
500
4.2 Gallons
850
5.8 Gallons
Table 2

HTP Mod Con 300 HL Specifications

General

Brand	HTP
Model	Mod Con 300 HL
Category	Boiler
Language	English