Carrier 30KAV-ZE Series - Evaporator Water Boxes Screws Tightening; Flow Rate Detection; Frost Protection

4.3 - Evaporator water boxes screws tightening
The evaporator is of the shell and tube type with removable water
boxes to facilitate cleaning. Before the unit is rst lled with water,
or after cleaning, tighten or re-tighten the boxes as per the diagram
below.
Water box tightening sequence
B
C
Key
B
Sequence 1: 1 2 3 4
C
Tightening torque
Sequence 2: 5 6 7 8 Bolt rating
Sequence 3: 9 10 11 12 M16 - 171 - 210 Nm
Sequence 4: 13 14 15 16
NOTE: During this procedure, we recommend that the circuit
is drained and the pipes are disconnected to ensure that the
bolts are tightened correctly and uniformly.
4.4 - Flow rate detection
All the units are equipped as standard with a ow switch set in the
factory (according to the size of the unit and the application).
If adjustment is necessary, it must be performed by qualied
personnel, approved by Carrier Service.
The heat-transfer uid pump must be controlled by the chiller if
the unit is not equipped with the hydraulic module option.
Dedicated terminals are provided for connection to the pump
control (wiring from chiller to pump control panel by others).
IMPORTANT:Thewaterowswitchforthemachinemustbe
operational. The Carrier warranty will be voided if this
instruction is not adhered to.
4.5 - Frost protection
WARNING: Damage caused by frost is not covered by the
warranty.
The evaporator, the pipes, and the hydraulic module pumps can
be damaged by frost. The components of the unit (evaporator &
hydraulic module) will be protected by following the
recommendations below. Protection of the remainder of the system
is the responsibility of the installer.
4.5.1 - Standard machine
If the chiller or the water pipes are in an area where the ambient
temperature is liable to fall below 0°C, it is recommended that
antifreeze solution is added (maximum of 45%, 40% for a unit with
a hydraulic module) to protect the unit and the water pipes to a
temperature of 10 K below the lowest temperature likely to be
reached at the installation site.
Only use antifreeze solutions approved for use with heat
exchangers. If antifreeze solution is not added to the circuit, and
the unit is not intended to be operated during freezing conditions,
the evaporator, the hydraulic module, and the outside pipes must
be drained. Check that there are no retention points.
4.5.2 - Frost protection heater option
In cases where it is not possible to apply the recommendations in
the paragraph above (§ 8.5.1), the units can be equipped with
heaters to protect the evaporator and the hydraulic module against
frost (option 41A or 41B).
The antifreeze solution and the heaters can be combined.
Protecting units with a hydraulic module against frost requires
water circulation in the hydraulic circuit. The unit pump will start
up automatically at regular intervals.
Combination of options for the periods
when the machine is in standby mode
Ambient unit
temperature range
30KAV-ZE 350 - 1300 /
30KAVPZE 350 - 800
30KAV-ZE/ 30KAVPZE
350-600
Without option 116 With option 116
> 0°C to 48°C - -
-20°C to 0°C
Option 41A
or
Suitable antifreeze
solution
(such as glycol)
Option 41B
(1)
or
Suitable antifreeze
solution
(such as glycol)
(1)
(1) Allow the pumps to circulate. If there is a valve, install a bypass (see diagram
for winter position).
If the system is isolated by a valve, it is imperative to install a
bypass as indicated below.
4 - WATER CONNECTIONS
25