Install Instructions

Page 51
Air Vent
A device used to purge air from the Circuit. Should
be located at the highest point in the Circuit.
Branch
The section(s) of supply and return piping, including
the heat distribution units connected directly to the
trunk. Also referred to as a “zone”.
Circuit
Entire water circulation piping, beginning and
ending at the boiler (Series Loop System).
Expansion Tank (Compression Tank)
Installed in the circuit to accommodate excess
water produced by heat expansion.
Diaphragm Expansion Tank
Used instead of Expansion Tank (Compression
Tank). Internal bladder separates air and water.
Heat Distribution Units
Transfers heat from the water supplied by the
boiler to the area to be heated through the use of
baseboard, convector, radiator, nned tube. Also
known as “radiation”.
Isolation Valve
Used to isolate the boiler from the circuit. It
minimizes the amount of water drained from the
system.
Low Loss Header
Used to allow boiler ow to be independent of
system ow so that Primary/Secondary system
piping is unnecessary and system piping is
simplied.
Primary-Secondary Piping
Two or more interconnecting circulating loops,
each with its own pump. Primary =System Circuit;
Secondary=Boiler Circuit.
Reverse-Return Piping
Balanced, equal ow (rst in, last out) piping. Utilized
with multiple boilers and/or radiation. Applied with
single or multiple system pumps.
System Purge Valve
A device used to purge air from the circuit. Should
be located as close as possible to the cold-water
feed, but not immediately after the cold-water feed.
Temperature Controllers
The primary temperature controller maintains all
normal heating operations.
Trunk
The section of piping which connects the boiler
return and supply with the branch(es). Also known
as a “main” or “header”. Should be same size as
boiler inlet/outlet connections.
Zone Pump
Circulator installed in branch piping that diverts hot
water coming from the boiler into various areas
(zones) of a building.
Zone Valve
Diverts hot water from the boiler into various areas
(zones) of a building.
12.D Glossary of Terms
MINI-THERM JX Residential Boilers
®