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www.klimor.com
www.klimor.com
MCKT - SUSPENDED MODULAR AIR CONDITIONING AND VENTILATION UNITS
OPERATION AND MAINTENANCE MANUAL
M6X16
BOLT
CONNECTING
PILLAR
M6 RIVET NUT
M6 SPRING
WASHER
HEAT
PUMP
MODULE
FRAME
HEAT PUMP
MODULE
CROSS-FLOW
EXCHANGER
BLOCK
DRAWING 10:
CPR and HPM interior connections.
The cross-flow exchanger and heat pump block are to be
connected with the use of interior corners in the CPR block,
rivet nuts mounted in the HPM frame and M6x16 bolts with
a washer (DRAWING 10).
Connection is done in eight places.
6.3 Connecting of Ventilation Ducts
Ventilation ducts should be connected with the MCKT
unit using elastic joints, which counteract vibration trans-
fers and compensate for minor deviation in the mutual
position of the duct and unit window. Ventilation ducts
should be connected with the joint flanges in the cor-
ners by means of bolts. In order for the elastic connection
to work properly, the joint sleeve should be extended
for a minimum of 110mm. The “earth” of the unit casing
should be electrically connected with the “earth” of the
ventilation network using the yellow-and-green wire
bolted onto the throttle valve and casing. Ventilation
ducts should have their own supports or suspensions.
6.4 Installation of the Bypass Damper Actuators
When the unit has two functions: a counter-current
cross-flow exchanger and a heat pump, there are two
actuator mounted on two dampers. Their installation
must be made in this way in the cooling mode: the by-
pass damper (3) is open; the damper on plate exchan-
ger (4) is close. In the heating mode, the position of
the dampers is vice versa. The figure below shows the
positions of dampers for heating mode in MCKT1-HPM.
open
close
1
2
3
4
DRAWING 11:
Counter-current cross-flow section in MCKT1-HPM
The actuator 1 is mounted on bypass damper, the actu-
ator 2 is mounted on damper on supply side of cross-
flow exchanger.
Both actuators are controlled by a single signal, but
work vice versa. When actuator (1) is open, the actuator
(2) is closed. It is important to mount them properly
and made the right work direction connection of AHU
side:
- for right AHUs side: actuator (1) = 1; actuator (2) = 0
- for right AHUs side: actuator (1) = 0; actuator (2) = 1
Installation of actuators must be done with opened
bypass damper (1) and closed exchanger damper (2).
The direction of rotation is made on each actuator.
0
1
DRAWING 12:
Settings of actuators rotation
6.5 Setting the Anti-frost protection of Counter-current cross
-flow Heat Exchanger
In MCKT with counter-current cross-flow heat exchanger,
setting the anti-frost protection is made on measuring of
exhaust air temperature after the heat exchanger and re-
quires no adjustment.
In MCKT with heat pomp module HPM, the anti-frost pro-
tection is carried out via the pressure guage installed at the
exhaust part of counter-current cross-flow heat exchanger.
The pressure setting is indicated on rating plate of device.
6.6 Connecting Heaters and Coolers
Exchangers should be connected in such a way as to
prevent stresses that may cause mechanical damage
and leaks. To this end we recommend appropriate com-
pensation of the supply and return pipeline mitigating
longitudinal expansion of the pipes. Bolting the supply
and return pipe to the exchanger joints should be done
using a counter torque wrench to hold the joint. The hy-
draulic installation and exchanger connection should
allow their unrestrained disconnection and removal
from the unit for the purposes of repair or maintenance.
Connecting the water exchangers should
allow counter-current operation. Otherwise
the averaged temperature difference of the
medium in the exchanger and the airflow will
be reduced, thus causing reduced exchanger
performance.
Only qualified refrigeration personnel may connect the
DX coils, following the rules for assembling this coils.
LEFT-HAND
SIDED VERSION
RIGHT-HAND
SIDED VERSION
AIRFLOW
AIRFLOW
SUPPLY
SUPPLY
RETURN
RETURN
DRAWING 13:
Manner of supplying water exchangers
LEFT-HAND
SIDED VERSION
RIGHT-HAND
SIDED VERSION
AIRFLOW
AIRFLOW
SUCTION (RETURN)
SUCTION (RETURN)
SUPPLY
SUPPLY
DRAWING 14:
Manner of supplying coolers for direct expansion
6.7 Adjustment of Heater and Cooler Performance
Adjustment of exchanger performance is done by
checking its output on the airflow side, by measuring
the air temperature before and behind the exchanger,
in supply and return temperatures and the amount of
medium flow determined in line with the design. Oper-
ation should be checked in an environment as close as
possible to the design environment. The exchanger per-
formance is related to the designed adjustment manner.
For water heaters, the most frequent method is adjust-
ment by variable supply temperature with the pump
system and mixing valve. For water coolers the most fre-
quent method is adjustment by quantity of the medium,
maintaining constant parameters of the medium. For
DX coil with direct expansion, operation parameters are
adjusted by changing the evaporation temperature or
medium quantity on the electronic thermostatic valve.
6.8 Carrying Away Condensate
The tubs of the cooling section, HPM module and cross-
flow exchanger have outlet flanges leading away from
the unit. The flanges should have drain traps mounted
to them to ensure appropriate condensate drainage
and prevent air suction. Traps are included in standard
delivery of the unit.
The trap used is an all-purpose device and may work on
the suction (pressure below atmospheric) and pump
(pressure above atmospheric) side of the fan. It is only
required that assembly works allow for the correct flow
direction on the condensate installation – appropriate
direction is shown on the lid.
For a trap working on pressure below atmospheric an
appropriately high terminal should also be made out of
supplied PVC pipes, working out value X where the trap
is going to operate.
For a trap working on pressure above atmospheric, ad-
ditionally the lid should be opened, the black rubber
plug removed, and then the lid should be closed.
50 mm
60 mm
Pa+
50 mm
Pa–
X
X=0.1x (PA pressure below atmospheric) + 10mm
DRAWING 15:
Trap working on pressure below atmospheric
50 mm
60 mm
Pa+
50 mm
Pa–
X
DRAWING 16:
Trap working on pressure above atmospheric
6.9 Power Connections
Only trained personnel with appropriate qualifications
should connect the unit’s devices to the power installa-
tion, following appropriate standards and rules.
In the first place one should make sure that the power
voltage and frequency and safeties are in accordance
with the values on the unit’s nameplates. If there are
discrepancies, do not connect. If it is necessary to use
long supply wires it is necessary to adapt their sections.
1. Bypass damper actuator
2. Counter-current cross-flow
damper acuator
3. Bypass damper
4. Counter-current cross-flow damper
