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Installation Manual
Page
26
Follow all code requirements
of the local authority on
condensate neutralizers
and whether or not they are
required for the installation.
-CONDENSATE DRAIN-
-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. If you are using Hydro Smart
pre-built panels the pressure relief valve will be on the primary(boiler) loop of the Master Panel and an
additional pressure relief valve may not be needed, check local codes.
• This micro-boiler does not come with an approved pressure relief valve.
• An approved pressure relief valve must be installed on the hot water outlet.
• The pressure relief valve must conform to ANSI Z21.22 or CAN 1-4.4 and installation must follow
local codes.
• The discharge capacity must be at least 120,000 BTH/h.
• The pressure relief valve needs to be rated for a maximum of 75 psi (0.5 MPa).
• Attach the discharge piping for the pressure relief valve and run the end of the tube to within 6
inches (152 mm) from the oor. This discharge tube must allow free and complete drainage without
any restrictions.
• If the pressure relief valve installed on the micro-boiler discharges periodically, this may be due to
a defective thermal expansion tank, defective pressure relief valve, or it could be signs of internal
scale build up.
• The pressure relief valve must be manually operated periodically to check for correct operation.
• No valves may be placed between the relief valve and the micro-boiler.
• 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, the manufacturer recommends that
condensate 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.
Condensate drain port
Installation
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