OPERATION AND MAINTENANCE MANUAL
DTR MCK v.2.4
PAGE
GDYNIA
MODULAR AIR HANDLING UNITS
MCKS, MCKH, MCKP
2017 EN
8/45
KLIMOR Spółka z ograniczon
ą
odpowiedzialno
ś
ci
ą
Sp.k., 81-035 Gdynia, ul. B. Krzywoustego 5
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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:
-
office
-
service
Electrical heaters
Electrical heaters installed in the AHUs can be single- or multi-step units with different power division for each stage.
Heaters are equipped with radiator heating elements with large heat exchange area. By factory default they are con-
nected to the terminal strip.
A choke is installed in the heating block cover and it enables leading through the heater power lead.
The diagram showing connection of heating elements to the terminal strip is attached to the casing.
The electrical heaters are equipped with a thermal trip switch protecting the device from overheating when the air flow
is stopped. Such trip switch with opening contacts should be considered in the control system plan.
T T N
T Z
I I I
I I
S E K C J A
S E K C J A
I
S E K C J A
1 2 3 4 5 6 7 8 9
3 x 4 0 0 V
s t o p i e ń I
s t o p i e ń I I
3 x 4 0 0 V
3 x 4 0 0 V
s t o p i e ń I I I
Figure No. 4
Example of connecting heating elements and a thermostat to the terminal strip in the 3-stage heater
Gas heating module
Gas heating module with gas burners enables heating up flowing air at the exhaust gases/air-type heat exchanger.
The "gas heating module" concept is related to the complete AHU block realizing this function. The MG heating mod-
el installed in the AHUs, among others, consists of the exhaust gases/air heat exchanger, fan burner, gas supply
path, pipe for connecting fume release funnel, pipe for releasing condensate and protecting automatic control system.
Applied standard fan burners are available in a modulated version.
Due to operation safety each type of the heating module has got a certain min and max air flow and min and max
power output of each burner. These data can be found in the burner's OMM supplied along with the AHU as well as
in the AHU technical data sheet. If these recommendations are not followed, the device may be damaged.
For AHUs with the heat recovery the heating module sections can be equipped with internal bypass chambers of the
heat exchanger with a control damper. The side flow is used in case of devices with air flow higher than acceptable
amount of air flowing through the heat exchanger. Amount of the bypass air is listed in the AHU technical data and
enables correct damper adjustment with the manual setting. The fan burner and the protecting control system switch-
board are installed at the casing's wall and they are protected with a deflected cover. External AHU versions also use
a solution with the heat exchanger and burner, fan burner and protecting control system's switchboard built-up inside
the section. Then all equipment is installed inside the section with free access from the operation side.
The heating module requires connection of the gas supply to the burner (gas path) and funnel for releasing fumes as
well as the condensate release system.
Gas heating module is a source of radiant heat and high temperature that appears at the time of air flow suddenly
stop. Therefore, for the protection of devices installed in the air flow in AHU and in the duct after AHU, security zones
are required. Inside AHU the gas module is empty section with a length of 750 ÷ 1000 mm depending on the type and
size of the module. The same is the length of an empty section after the gas module in the case of the other functions
of AHU. If gas module is the last section of the AHU, you must also provide a minimum distance of 500 to 750 mm to
mounting devices (e.g. silencers). This distance can provide duct reducer.
Observe required and recommended air flow amounts through the heat exchangers and bypass. Do not
change or adjust the heat exchanger bypass damper opening level during operation of the gas heating mod-
ules.
Burners are supplied with
IIe2
(GZ50),
LW
(GZ41,5);
LS
(GZ35) and
3PB/P
(LPG) gas.
Gas type has to be specified at the unit selection and must be specified in the order.
In case of external AHUs movable shields or roofing are used as a protection against rain and UV.
The MG gas heating modules are supplied with a separate additional operation and maintenance manual
(OMM). When starting the device strictly follow all instructions and precautions contained within.
Information related to the burner start-up are also provided in the section 6.2.3.
SECTION
SECTION
SECTION
STAGE I
STAGE II
STAGE III