IBC HPX 3, Инструкция по установке и эксплуатации, Страница: 26 / 68

Ensure that the selected circulator delivers a minimum the following minimum flow:
Heat Pump Flow Requirement
HPX 3 HPX 5
Rated Water Flow* 6.6 gpm / 1.5 m
3
/h 7.5 gpm / 1.7 m
3
/h
Water Pressure Drop (Head Loss) 7 feet / 2.1 m 9 feet / 2.7 m
Minimum Heat Pump Flow Rate (Variable
Speed Pump) 3.1 USgpm / 0.7 m
3
/h 4.0 USgpm / 0.9 m
3
/h
Maximum Heat Pump Flow Rate (Fixed Speed
Pump) 10.1 USgpm / 2.3
m
3
/h
12.0 USgpm / 2.7
m
3
/h
Recommended Heat Pump Flow Rate 7.0 USgpm / 1.6 m
3
/h 10.0 USgpm / 2.3
m
3
/h
* "Rated" indicates the flow rate at which the heat pump's heating output, pressure drop and
noise was measured
Do not reduce pipe sizes from the HPX's supplied connectors; in some cases, it will be preferable
to increase pipe size. Some circulators have a minimum water temperature rating above the low
temperature potential of the hydronic heat pump. If cooling mode is to be used, purchase a volute
insulation block from the circulator manufacturer.
Propylene glycol usage
Warning
Do not use automotive-type ethylene or other types of automotive glycol antifreeze, or
undiluted antifreeze of any kind. This may result in severe heat exchanger damage.
Installers must ensure that glycol solutions are formulated to inhibit corrosion in
hydronic heating systems of mixed materials. Improper mixtures and chemical
additives may cause damage to ferrous and non-ferrous components as well as non-
metallic, wetted components, normally found in hydronic systems. Ethylene glycol is
toxic, and may be prohibited for use by codes applicable to your installation location.
For environmental and toxicity reasons, IBC recommends only using non-toxic
propylene glycol.
Propylene glycol solution is commonly used in a closed loop where freeze protection is required.
Its density is lower than that of water, resulting in lower thermal performance at a given flow and
pressure. Generally, a 50:50 solution of propylene glycol and water requires an increased system
circulation rate (gpm up 10%), and system head (up 20%) to provide performance equivalent to
straight water. For the
HPX Series
hydronic heat pumps propylene glycol concentrations between
25% and 50% are permitted.
These hydronic heat pumps are designed for use within a closed loop, forced circulation, low
pressure system. A pressure relief valve must be field-supplied. Relief valve discharge piping
must terminate between 6" (15 cm) and 12" (30 cm) above the floor or per local code.
26
Section: Installation