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7 Installation
Installer reference guide
35
EWAQ+0 EK(2)CB
EKMB9W1
Packaged air-cooled water chillers and packaged air to water heat
pumps
4P492901-1 – 2017.06
If …
… then
Heater tape model (-H- in the
model name)
The internal water piping is
factory‑equipped with heater
tape and additional insulation,
this to prevent it from freezing.
To prevent the outdoor field
piping from freezing, provide it
with sufficient insulation or heater
tape (field supply), according to
the instructions below.
Heater tape (field supply)
1
Install heater tape to the outdoor field piping.
2
Provide external power supply for the heater tape.
NOTICE
▪ For the internal heater tape to operate, the power to the
unit MUST be ON. For this reason, during cold periods,
never disconnect the power, nor turn off the main
switch.
▪ In case of a power failure, power to the heater tape
(both internal and external) will be aborted and the
water circuit will NOT be protected. To guarantee a full
protection, it is always possible to add glycol to the
water circuit, even when installing heater tape to the
outdoor field piping.
Glycol
The required concentration of glycol depends on the lowest
expected outdoor temperature, and on whether you want to protect
the system from bursting or from freezing. To prevent the system
from freezing, more glycol is required. Add glycol according to the
table below.
INFORMATION
▪ Protection against bursting: the glycol will prevent the
piping from bursting, but NOT the liquid inside the
piping from freezing.
▪ Protection against freezing: the glycol will prevent the
liquid inside the piping from freezing.
NOTICE
In case of reversible systems (cooling), ALWAYS
protect the piping and plate heat exchanger from freezing.
NOTICE
In case the lowest expected outdoor temperature is not
mentioned in the table, select the worst case value.
Example:
If the lowest expected outdoor temperature is –
10°C, add 35% of glycol to the system.
Lowest expected
outdoor
temperature
Prevent from
bursting
(a)
Prevent from
freezing
–8°C
15%
20%
–15°C
20%
35%
(a)
For cooling-only systems only. In case of reversible
systems (cooling), ALWAYS prevent the piping
and plate heat exchanger from freezing.
NOTICE
▪ It is the responsibility of the installer to add the correct
glycol percentage, depending on the expected ambient
temperatures.
▪ The addition of glycol applies to BOTH cooling‑only
models (008BAVP) AND reversible models
(008BAVP), and is independent of cooling
or heating operation.
▪ The required concentration might differ depending on
the type of glycol. ALWAYS compare the requirements
from the table above with the specifications provided by
the glycol manufacturer. If necessary, meet the
requirements set by the glycol manufacturer.
▪ The added concentration of glycol should NEVER
exceed 35%.
▪ If the liquid in the system is frozen, the pump will NOT
be able to start. Mind that if you only prevent the
system from bursting, the liquid inside might still freeze.
▪ In case of a power supply failure or pump failure, and
NO glycol was added to the system, drain the system.
▪ When water is at standstill inside the system, the
system is very likely to freeze and get damaged.
The following types of glycol are allowed:
▪
Ethylene glycol
;
▪
Propylene glycol
, including the necessary inhibitors, classified as
Category III according to EN1717.
WARNING
Ethylene glycol is toxic.
NOTICE
Glycol absorbs water from its environment. Therefore do
NOT add glycol that has been exposed to air. Leaving the
cap off the glycol container causes the concentration of
water to increase. The glycol concentration is then lower
than assumed. As a result, the hydraulic components
might freeze up after all. Take preventive actions to ensure
a minimal exposure of the glycol to air.
NOTICE
▪ If overpressure occurs, the system will release some of
the liquid through the pressure relief valve. If glycol was
added to the system, take adequate measures so as to
safely recover it.
▪ In any case, make sure that the flexible hose of the
pressure relief valve is ALWAYS free to release
pressure. Prevent water from staying and/or freezing
up inside the hose.