OPERATION AND MAINTENANCE MANUAL
DTR MCK v.2.4
PAGE
GDYNIA
MODULAR AIR HANDLING UNITS
MCKS, MCKH, MCKP
2017 EN
14/45
KLIMOR Spółka z ograniczon
ą
odpowiedzialno
ś
ci
ą
Sp.k., 81-035 Gdynia, ul. B. Krzywoustego 5
Fax: (+48 58) 783-98-88; Tel.: (+48 58) 783-99-99
Service -
Fax: (+48 58) 783-98-88; Tel.: (+48 58) 783-99-50/51 Mobile: (+48) 510 098 081
Information in this document is subject to change
email:
klimor@klimor.pl
-
office
serwis@klimor.pl
-
service
In the air exhaust section, downstream the heat exchanger there is located the droplet separator and drip tray with a
outlet connector on the operational side (AHU size 11
–
also on the other side).
Make sure to install a drain trap at the tank outflow connector, according to instructions listed in point 6.2.6
At the heat exchanger inlet there is a damper consisting of two sections: one at the exchanger and the other one at
the bypass. Both sections are coupled, so that at full air flow through the heat exchanger the exchanger's bypass
section is closed. And closing the heat exchanger opens the bypass section.
The bypass installed at the heat exchanger enables bypassing the exchanger by flowing air. Directing the air via the
bypass occurs in summer or when the heat exchanger anti-frost protection system is activated.
The anti-frost protection system prevents from excessive cooling down of the heat exchanger and from frosting the
heat exchanger air exhaust section.
The anti-frost protection system consists of:
- cross-flow exchanger damper actuator
- sensor of pressure difference upstream and downstream the exchanger,
- controller.
Once the presumed pressure drop at the pressure gauge is achieved due to frosting of the heat exchanger, the con-
troller send a signal to the actuator
–
the damper at the heat exchanger is closed and the bypass air flow is opened.
This condition is maintained till the heat exchanger is warmed up and frost is melted. Since that time the heat ex-
changer damper starts to open, directing more and more fresh air through the heat exchanger.
NOTE! The cross-flow and high-performance hybrid heat exchanger block as standard is delivered without the anti-frost
system. Type of the system is determined by an AHU or control system designer. Pressure system is recommended.
2.3.2.9 Heat recovery block with intermediate medium
The set with the intermediate medium enables heat recovery at a level of 55% and in the high-performance set up to
70%. The set separates flow of exhaust air from supply air. It can also operate in separated air supply and exhaust
AHUs.
The set consists of two Cu-Al heat exchangers and the system with the circulating pump (option). Design of the heat
exchangers is similar to the Cu-Al water coolers and heaters.
A heat exchanger located in extracted airflow (cooler) absorbs the heat from the air and pass it over to the intermedi-
ate medium. Water solution of ethylene/propylene glycol is the intermediate medium, which circulates in pipes con-
necting both exchangers. The heat exchanger located in the supply airflow serves as a preliminary heater, passing
the heat over from the medium to the air. The heat exchanger located in the exhaust airflow (cooler) is equipped with
a droplet separator and the section is additionally equipped with the drain plate with an outlet connector on the opera-
tional side (also on the other side in AHUs size 11).
There are two possible system versions:
- Heat exchangers are installed in the NW AHU assembly set
The glycol system features a complete equipment: circulating pump, expansion vessel, pipelines, anti-frost system,
manometer, valves. The equipment is located outside and inside the casing and is arranged within a length of the set.
- Air supply AHUs and air exhaust AHUs are far from each other.
The heat recovery exchangers are installed in air supply and air exhaust AHUs.
The glycol system is located outside the AHUs. Depending on the pipeline length and system complexity, which influ-
ences the glycol flow resistance, power of the pump motors may be higher than those listed in the table above.
The system is made of welded PP pipes and in case of diameters over DN63 the system can be made of galvanized
screwed pipes.
In case of external AHUs the system made of plastic (also steel), if it is located outside the AHU casing, should be
protected using insulation of thickness defined in the PN requirements and should be coated with material UV-
resistant. The Klimor delivery does not contain such insulation.
In other cases the system made of plastic (and steel) does not require additional external insulation.
As standard the multi-level, centrifugal circulating pumps with constant-rotation motors are used. An inverter
(optional) is used to control of the pump output.
The internal AHUs are equipped with Danfoss FC51 inverters and external AHUs are equipped with LG IC5 inverters.
In case of external AHUs with piping located outdoors, it is necessary to protect the circulating pump and valves
against impact of low temperatures (insulations, shields
–
not provided by Klimor)
In the highest points of the system there are breathers.
Use seals made of aggressive glycol-resistant material.
The glycol system is equipped with anti-frost protection, which prevents from excessive temperature drop in the air
exhaust section.
The anti-frost protection system consists of:
- Pressure gauge (located at the glycol cooler)
- 230V 50Hz inverter
