Installation Instructions

24
Pressure relief valve
The micro boiler has a high-temperature shutoff switch built in as a standard safety feature (called a
Hi-Limit switch) therefore a “pressure only” relief valve is required.
• This unit does not come with an approved pressure relief valve.
• An approved pressure relief valve must be installed on the hot water outlet.
• The pressure relieve vale must conform to ANSI Z21.22 or Can 1-4.4 and installation must follow
local codes.
• The discharge capacity must be at least 199,000 BTU/h.
• The pressure relief valve needs to be rated for a maximum of 150 psi (1 MPa).
• The discharge piping for the pressure relief valve must be directed so that the hot water cannot
splash on anyone or on nearby equipment.
• Attach the discharge tube to the pressure relief valve and run the end of the tube to within 6
in.(152 mm) from the oor. This discharge tube must allow free and complete drainage without any
restrictions.
• If the pressure relive valve installed on the micro boiler discharges periodically, this may be due to
a defective thermal expansion tank or defective pressure relief valve.
• The pressure relief valve must be manually operated periodically to check for correct operation.
• No valve must be placed between the relief valve and the micro boiler.
CONDENSATE DRAIN
• The micro boiler does not include a built-in condensate neutralizer cartridge for reducing the pH
level of condensate water. If local codes dictate that condensate must be neutralized prior to
drainage, a condensate neutralizer must be installed. An accessory Neutralizer assembly is sold
separately.
• In the absence of applicable local codes and regulations, th manufacture recommends that con-
densate be disposed of into a standard drain. Connect a drain tube from the condensate drain port
(shown below) located on the bottom of the micro boiler to a standard drain.
Follow all code requirements
of the local authority on
condensate neutralizers and
whether or not they are required
for the installa
Condensate drain port