Installation and operation manual
8 Technical changes reserved
6. Connection of the unit to heating system
Please check all hot water connections for readiness and perfect condition before
connecting media to the unit. Furthermore, please check the hot distribution for
components or other measures to ensure zero transmission of static, dynamic, and
dilatation forces at the input and output neck connections. No excessive force may be
applied when connecting the hot water circuit of the building to the unit’s heat exchanger.
By the neck of the air conditioner there is a mark that notes use of two keys so that no
stressing of the necks occurs in the course of tightening or loosening. When bolting and
tightening up the screw union of the heat exchanger must be secured by a clamp against
undesired rotation that may subsequently result in deformations or damage to pipe necks
on the heat exchanger.
Considering the above the manufacturer clearly recommends that flexible connection hoses are used for connection of the heat
exchanger necks (available as PPH accessories, length 300mm, DN25, 32), or a bellows compensator.
Any non-compliance with the instructions above results in rejection of any complaint.
By default, neck for the hot water heater is located on the right hand side on the upper part of the unit (may be placed elsewhere
upon request). The inputs are identified by round marks –medium input red with arrow pointing inside, and medium output blue
with arrow pointing outside.
Do not swap the return and supply neck positions - this may cardinally change performance and parameters of the heater with
consequent impact on the hydraulic system. Do not exceed max temperature and pressure for which the unit is rated.
If required, the valve may be embedded in the unit. Some types of the valves may not be placed in the unit for room reasons
(located outside the equipment). The value of thermostatic head is pre-set, and the function of the electrothermic valve drive is
given by a control type. The connection is then made directly on the neck for media input (third neck is blind). For configuration
of the electrothermic drive functions, refer to clause 6.1.
Pay attention to quality of media fed to the unit; check for installation of cleaning valve downstream the unit (not included in the
supply). Observe max temperature and media pressure to avoid heat exchanger damage. To make sure the heat exchanger
operates correctly, drain the exchanger (sludge valve) and purge the cleaning valve because construction or assembly impurities
may be present in the system. Deaerate the heat exchanger for perfect operation of the heat exchanger. Install the closing valves
on both pipes downstream the unit (ball valves) . Connection thread right above the unit must be removable and not fixed.
As required by the customer, an embedded 2-way valve with control head can be delivered for the hot water heat exchanger. The
valve drive may be electrothermic.
Instructions for electric connection of the valve is included in the wiring scheme for connection of the unit. Specific wiring scheme
or valve instructions are available upon request only.
Connection of 2-way ETVQ
valve
