MOTIVAIR MLC-SC-FC 0200 User manual

MOTIVAIR COOLING SOLUTIONS
85 Woodridge Dr. Amherst, NY 14228 –Phone# [phone] –Fax# [phone]
www.motivaircorp.com
AIR COOLED CHILLERS
MODELS: MLC-SC-FC 0200 –MLC-SC-FC 1100
INSTALLATION, OPERATION, AND MAINTENANCE
MANUAL
This chiller has been factory run tested to the specified
water pressure
*****DO NOT OVER PRESSURIZE CHILLER WHEN LEAK
CHECKING PIPING OR FILLING HYDRAULIC SYSTEM*****
*Isolate chiller from piping if higher test pressure is
required for leak checking*
*Chiller damaged caused by over pressurization is NOT
covered by warranty*

LEGAL PROVISIONS & SAFETY INSTRUCTIONS
Operator's Responsibility This chiller MUST be installed, maintained and operated by a person(s)
qualified for this equipment. This chillercontains refrigeration, water
circulation and electrical components. The person(s) most suited for this
equipment is a qualified licenced refrigeration technician. Intervention by
unauthorized or unqualified parties may void the warranty.
WARNING
Operation of these systems involves potentially Iethal dangers (high
voltage and high pressures). Therefore, all safety precautions and
warnings described in this manual must be precisely observed.
Otherwise, severe or fatal injury may be caused.
SAFETY INSTRUCTIONS
The installation, start-up and maintenance of the chillers are
dangerous, Due to:
•High pressures is generated in the equipment
•Electrical parts are energized
•The equipment contains hot pipes (Refrigeration system)
•Rotating parts (fans and or pumps) can cause injury the chillers
themselves may be installed in a dangerous position (roof, high
built frame etc.)
For these reasons, the chiller must be installed and connected to the
electricity/water installations by qualified companies only. Startup and
maintenance must be conducted by a qualified refrigeration company
only.
Simple maintenance operations on the equipment without opening
them may be performed by the operator. All other work must be
performed by specially qualified personnel.

TRANSPORT AND HANDLING
LIFTING - UNLOADING – POSITIONING
Notices (symbols) –
on device packing must be
observed.
Check the center of gravity of the chiller.
Use appropriate unloading equipment.
Remove protective film from chiller and cardboard.
behind condenser before use.
MANUFACTURER'S NOTE
The machine may be damaged by:
Dropping or tipping it on the ground.
Pulling the chiller by cords, straps, etc.
Lifting the chiller by its piping system.
Excessive shaking by cranes.
Damage of this type is not covered by warranty.
ECA
ECA
MAX 45°
ECA
ECA

LIFTING - UNLOADING – POSITIONING
Notices (symbols) –
on device packing must be
observed.
Check the center of gravity of the chiller.
Use appropriate unloading equipment.
Remove protective film from metal panels before
use.
MANUFACTURER'S NOTE
The machine may be damaged by:
Dropping it or tipping it on the ground.
Pulling the chiller by cords, straps etc….
Lifting the chiller by its piping system.
Excessive shaking by crane.
Damage of this type is not covered by warranty.
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Use the forks to lift with: they must be as long
as the chiller. Use of fork extensions if
required, OR SERIOUS DAMAGE MAY RESULT.

Foundation
Site Installation
Installation
Structure-borne noise
Vibrations
Clearances
1. The condenser air is blown out vertically or horizontally.
2. Do not install the device close to heat sources. Heated air intake must be
avoided.
3. The condenser fans are rated for ZERO external static pressure. The fan
do not have the capacity to push air through ducting, which means that
NO DUCTS OR MUFFLERS may be used on the inlet ot outlet of the
chillers.
4. No air short-circuit is permitted, i.e. the heated discharge air from the
condenser fans must never be drawn back into the condenser inlet. This
will occur if the chiller is too close to a wall, or a low ceiling or other
obstructions.
5. In the case of shaft or trench mounting, contact the manufacturer for
advice on the installation site.
It ispossible thatnoise or vibration may betransmitted through the ground,
or building structure. If this occurs, it may benecessary toinstall a vibration
elimination device. The construction specifications ofthe
customer/engineering contractor regarding structure transmitted noise or
vibration must be observed.
May betransmitted through the chilled water piping. This can beavoided by
the use of flexible piping connections.
Must bemaintained for servicing and ventilation purposes. All removable
side panels must be available service.
*See CLEARANCE REQUIREMENTS section under MOTIVAIR INSTALLATION
ENGINEERING BULLETIN
CHILLER INSTALLATION
All chillers must be mounted ona solid, horizontal surface,suitable for the
weight of the chiller.* Note the chiller weight is incresed byfillingwith
glycol/water mixture.
Observe all local regulations.
Compliance with the following basic rules for the erection ofdevices with
radial fans will ensure problem-free operation andthe rated refrigeration
capacity.
Basic rules:

Motivair Installation Guide Page 1
Motivair Installation Engineering Bulletin
Service Access:
Compressors, filter-driers, and manual liquid line shutoff valves are accessible on the front end
and both sides of the chiller. Each compressor (two) has its own contactors and overloads
mounted in the control box located in the front of the chiller. The main control box contains the
chiller PLC (Programmable Logic Controller). The solid state compressor starter, fan control
and other power equipment are located in the main control box. Condenser fan VFD’s and
overloads are located in an independent box on the side of the chiller. The side clearance
required for airflow provides sufficient service clearance.
On all MLC/MLC-FC condenser fan assemblies can be removed from the top of the unit for
service if necessary.
_____________________________________________________________________________
CAUTION
Disconnect all power to the chiller while servicing condenser fan motors or compressors.
Failure to do so can cause bodily injury or death.
______________________________________________________________________________
Do not obstruct access to the sides or ends of the chiller with piping or conduit. These areas
must be open for service access. Do not obstruct any access to the control panels with field
mounted disconnect switches. Make sure that the power conduit to each panel does not restrict
access to the filter-driers located between the compressors under the main control box.

Motivair Installation Guide Page 2
Clearance Requirements:
Figure 1
Notes:
1. Minimum side clearance between units is 12 feet (3.7 meters).
2. Unit must not be installed in a pit or enclosure that is deeper or taller than the height of the unit
unless extra clearance is provided per note 4.
3. Minimum clearance on each side is 8 feet (2.4 meters) when installed in a pit no deeper than the
unit height.
4. Minimum side clearance to a side wall or building taller than the unit height is 7 (2.1 meters) feet
provided no solid wall above 7 (2.1 meters) feet is closer than 12 (3.7 meters) feet to the opposite
side of the unit.
5. Do not mount electrical conduits where they can block service access to compressor controls,
refrigerant driers or valves.
6. There must be no obstruction of the fan discharge.
7. Field installed switches must not interfere with service access or airflow.
8. MLC/MLC-FC chillers use axial fans and are not suitable for ducted applications.
9. See the following pages if the airflow clearance cannot be met.
Restricted Airflow:
General
The clearances required for design operation of MLC/MLC-FC air-cooled condensers are
described in the previous section. Occasionally, these clearances cannot be maintained due to

Motivair Installation Guide Page 3
site restrictions such as units being too close together or a fence or wall restricting airflow, or
both.
The Motivair MLC/MLC-FC chillers have several features that can mitigate the problems
attributable to restricted airflow.
The “W” shape of the condenser section allows inlet air for these coils to come in from
both sides and the bottom. Facing the control cabinet, the right-side “V” condenser
serves the compressor on the right and vice versa for the left. Every compressor
always has its own independent refrigerant circuit.
The PLC control is proactive in response to off-design conditions. In the case of single
or compounded influences restricting airflow to the unit, the PLC will act to keep the
compressor(s) running (at reduced capacity) as long as possible, rather than allowing a
shut-off on high discharge pressure.
Figure 2
The following sections discuss the most common situations of condenser air restriction and give
capacity adjustment factors for each. Note that in unusually severe conditions, the PLC
controller would adjust the unit operation to remain online until a less severe condition is
reached.
CAUTION
The unit capacity adjustment charts in this engineering bulletin serve only as a guide, and DO NOT
take into account prevailing site conditions.
_____________________________________________________________________________________

Motivair Installation Guide Page 4
Case 1, Building or Wall on One side of One Unit:
The presence of a screening wall or the wall of a building, in close proximity to an air-cooled
chiller is common in both rooftop and ground level applications. Hot air recirculation on the
coils adjoining the wall increases compressor discharge pressure, decreasing capacity and
increasing power consumption.
When close to a wall, it is desirable to place chillers on the north or east side of them (to
minimize solar effect). It is also desirable to have prevailing winds blowing parallel to the unit’s
long axis. The worst scenario is having wind blowing hot discharge air into the wall.
Figure 3
Figure 4, Adjustment Factor

Motivair Installation Guide Page 5
Case 2, Two Units Side By Side:
Two or more chillers positioned side by side are common. If spaced closer than 12 feet it is
necessary to adjust the performance of each unit; circuits adjoining each other are affected. If
one of the two units also has a wall adjoining it, see Case 1. Add the two adjustment factors
together (Figure 4 and Figure 6) and apply to the unit between the wall and the other unit.
Mounting units end to end will not require adjusting performance. Depending on the actual
arrangement, sufficient space must be left between the units for access to the control panel door
opening and/or evaporator tube removal. See “Clearance” section of this guide for requirements
for specific units.
Pit or solid wall surrounds should not be used where the ambient air temperature exceeds 105°F.
Figure 5, Two Chillers Side by Side
Figure 6, Adjustment Factor