Aspen RMC-800 User manual

24 St. Martin Dr.
Marlborough, MA 01752
Installation and Operation Instructions
Rack Mount Chiller (RMC-800, RMC-1100)
FP00091, FP00101
Installations Notes
Date of Purchase
Date of Installation
Installer
Model Number
Serial Number

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Contents
System Information ......................................................................................................................................3
Safety ............................................................................................................................................................3
General Operation ........................................................................................................................................4
Environmental...........................................................................................................................................4
Coolant Interface ......................................................................................................................................4
Coolant Connections.............................................................................................................................4
Filling.....................................................................................................................................................4
Draining.................................................................................................................................................5
Airflow...................................................................................................................................................5
Other Considerations............................................................................................................................5
Mounting...................................................................................................................................................5
Electrical Interface ....................................................................................................................................6
External Thermistor ..................................................................................................................................6
Performance .................................................................................................................................................6
Cooling Capacity........................................................................................................................................6
Performance Curves..................................................................................................................................6
Coolant Flow Rate.....................................................................................................................................7
Controller Interface.......................................................................................................................................8
Primary Functionality................................................................................................................................8
Changing the Setpoint ..........................................................................................................................8
Starting the RMC...................................................................................................................................9
Turning off the RMC..............................................................................................................................9
Operating Modes..................................................................................................................................9
Parameter Tree .......................................................................................................................................10
Controller Login.......................................................................................................................................11
System Errors..........................................................................................................................................11
Faults...................................................................................................................................................11
Clearing Faults.....................................................................................................................................11
Warnings.............................................................................................................................................11
Communication...........................................................................................................................................11
Maintenance...............................................................................................................................................14
Customer Service ........................................................................................................................................14
Commercial Product Warranty ...............................................................................................................14
Warranty Repairs ....................................................................................................................................15
Technical Support ...................................................................................................................................15
Aspen Contact Information.....................................................................................................................15

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System Information
The Rack Mount Chiller (RMC-800, RMC-1100) is a turn key 2U (3.5 in. tall) chiller system. The RMC
provides a user interface to control the coolant setpoint, pump speed and alarm settings. The system
maintains coolant supply temperature with a PID loop that varies the compressor speed. Details on the
system interface and performance are included below.
Figure 1: RMC-800 (FP00091) or RMC-1100 (FP00101)
Safety
The RMC contains Tetrafluoroethane (R-134a) as a refrigerant. R-134a is an approved long-term
replacement for CFC-based refrigerants and an approved ozone depleting substance (ODS) alternative.
In the event that the RMC is damaged, general work clothing, leather gloves, and eye protection should
be worn to prevent exposure to refrigerants. The RMC also contains Polyolester (POE) oil, which is used
by the compressor. Contact Aspen for the MSDS for either of these internal fluids.
Precautions relating to the personnel hazards regarding contact with this substance should be outlined
in training and technical manuals.
Disposal of R-134a must comply with federal, state, and local disposal or discharge laws.
WARNING! R-134A is subject to U.S. Environmental Protection Agency Clean Air Act
Regulations Section 608 in 40 CFR Part 82 regarding refrigerant recycling, therefore the
refrigerant must be evacuated from the RMC prior to disposal of the assembly.
CAUTION! Skin contact with refrigerant may cause frostbite.

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General Operation
Environmental
Coolant Koolance 702 (contact Aspen for use of other coolants)
Ambient (Operation) 5°C to 40°C (41°F –104°F)
Ambient (Storage) -20°C to 50°C (-4°F –122°F)
Weight RMC-800 (FP00091) –10.4 kg (23.0 lb)
RMC-1100 (FP00101) –11.0 kg (24.0 lb)
Size 55.9 x 48.3 x 9.0 cm (22.0 x 19.0 x 3.5 in)
Coolant Interface
Aspen recommends using Koolance 702 as the working fluid for this system. The use of water without
additives may result in corrosion and/or biological growth in an untreated system. The coolant and
customer coolant loop should be clean and free of debris. The RMC is equipped with an internal coolant
filter; however, this filter is intended to protect the pump from debris in the coolant loop. The presence
of foreign materials into the RMC, could damage components and reduce system performance. Aspen
recommends that the customer use an external filter prior to the return line to prevent any foreign
material from returning to the RMC.
Figure 2 - RMC Front Panel
Coolant Connections
The coolant connections for the RMC are female LC Series CPC (Colder Products) quick disconnect
fittings (see Figure 2), with shutoff valves. Male mating connectors (with shutoff valves) must be
attached to both fittings at startup.
Filling
The RMC contains a 1 L reservoir. The reservoir is filled by removing the red fill cap at the front of the
system (see Figure 2). The system must be about 50% full to operate. Overfilling the systems is not
recommended to prevent possible spillage.
Aspen recommends an external coolant filter on the return line to prevent any damage to
internal components or degradation of the RMC’s cooling capacity and efficiency.

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Draining
To drain the system, a female LC series CPC (Colder Products) quick disconnect fitting is located at the
bottom of the reservoir (see Figure 2). Attaching a mating male quick connect and allowing to drain
under gravity will empty the reservoir. Additional coolant will remain within the system, which cannot
be drained by gravity.
Airflow
The RMC requires airflow to sufficiently cool the system. Aspen requires at least 4 inches of clearance in
front of the air inlet (front panel) and the air exhaust (rear).
Other Considerations
The RMC has two exposed un-insulated sections (the quick connect fittings and the reservoir). If
operating in an environment where the coolant temperature is below the dew point of the ambient air,
these surfaces will collect condensation. To prevent condensation from forming, these surfaces must be
insulated by the user.
While the Koolance 702 fluid depresses the freezing temperature of the coolant (-15°C, 5°F), it may be
possible to freeze during operation. The RMC can freeze a fluid at a setpoint greater than the freezing
point of the coolant. Care must be taken to not operate at a coolant temperature within 5°C of the
freezing point of that coolant.
Mounting
The RMC is a rack mount chiller (2U). The outer dimensions and mounting dimensions are defined in
Figure 3. Some customers may wish to have the RMC as a desktop unit, and for that, Aspen can
recommend adhesive feet for the unit.
Figure 3: RMC Dimensional Drawing - Note all dimensions are in inches

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Electrical Interface
Input Voltage 120 VAC or 240 VAC (24 VDC available upon request from Aspen but
is dimensionally different). Input voltage is specified at time of
purchase with Aspen.
Maximum Power 600 W (5 A at 120 VAC, 2.5 A at 24 VDC)
Figure 4: RMC Power Interface
External Thermistor
The RMC has an electrical connector to support an external thermistor, if desired (not supplied). This
external thermistor if the customer wishes to use the RMC to control to an external temperature (i.e.
mounted on the heat source) or if the customer wishes to control the coolant to above ambient.
The connector for the external thermistor is a 2 pin connector, Molex Microfit (part number:
0430200200). The user must connect to this with wire harness that consists of a mating connector and a
NTC 10 kOhm thermistor (Type 2). The type of thermistor is dependent on the customer’s application,
but Aspen can provide guidance if needed.
Performance
Cooling Capacity
Each RMC is qualified to meet a performance threshold at 20°C ambient, 20°C coolant, with a flow rate
of 3.5 L/min using Koolance 702 fluid. The performance threshold for each version of the RMC is as
follows:
RMC-800 (FP00091) 800 W
RMC-1100 (FP00101) 950 W
Performance Curves
The performance curve below (Figure 5) defines the nominal performance of the RMC. The data shown
below is derived using coolant flow and Koolance 702 coolant as a function of coolant temperature and
ambient temperature.
CAUTION! The RMC must be operated in the vertical orientation. Operation of the
system at an orientation off from vertical will result in reduced system capacity or
damage to the compressor.
CAUTION! Operating the RMC outside the voltage range will void the system warranty.

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Figure 5: RMC-1100 Performance Map
Figure 6: RMC-800 Performance Map
Coolant Flow Rate
The RMC is equipped with a positive displacement pump. Using Koolance 702 as a coolant, the system
can generate the following maximum flow curve. The speed of the pump may be reduced should the
user desire less flow.

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Figure 7: RMC Pressure/ Flow Curve
The RMC is equipped with a bypass valve to prevent the pump from generating excessive pressures. The
bypass valve begins to crack around 4.0 bar (58 psig). The bypass valve will prevent the system (and
external components) from seeing pressures greater than 6.9 bar (100 psig). This valve will open at a
lower differential pressure, as there is pressure drop in the system return line.
Controller Interface
The RMC is equipped with a controller, which monitors and controls the system. The primary interface
of the system is shown in Figure 8 below.
Figure 8: Controller Interface
During normal operation the controller displays the symbols showing the compressor, fan and pump are
operating. The display also shows the coolant temperature and the compressor speed signal (0 –100%).
These are displayed in Figure 8.
During normal operation if the user presses the button, the controller will display the setpoint
temperature.
Primary Functionality
Below are some of the critical functions of the RMC. Additional functionality can be accessed in the
parameter tree.
Changing the Setpoint
To change the setpoint, the user must do the following:
Press .

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Press 3 times to reach the PAR screen. Press .
Press 1 time to reach the CFG screen. Press .
Press on the Set screen.
Use the and arrows to adjust the setpoint. Press .
Press 3 times to return to the main screen.
Starting the RMC
To start the system, the user must do the following:
Press .
Press 2 times to reach the Str screen. Press .
When On is displayed, Press .
Turning off the RMC
To turn the RMC off, the user must do the following:
Press .
Press 2 times to reach the Str screen. Press .
Press 1 time to reach OFF. Press .
Operating Modes
The RMC offers 3 operating modes:
1) The RMC controls to supply temperature (at the supply CPC) (default)
2) The RMC controls to an external input thermistor (see External Thermistor, p. 6)
3) The RMC controls to an internal temperature which is 1°C greater than an external ambient
temperature. Customers may use this functionality to ensure coolant lines are non-condensing.
To select the operating mode, the user must do the following:
Press .
Press 3 times to reach the PAR screen. Press .
Press on the GEN screen.
Press on the StU screen.
Press 4 times to reach the control sensor screen (y08). Press .
Use the and arrows to select the sensor to use (internal [TI] or external [TE]). Press .
If above ambient operation is required, press once, then press to reach control mode
(y09).
Use the and arrows to select the control mode to use (direct [def] or ambient +[Amb]).
Press . Note: ambient+ mode can only be used when controlling to internal thermistor (TI).

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Press 4 times to return to the main screen.
Parameter Tree
The table below represents all the functionality of the controller. Some items are only accessible by
entering the login password (see Controller Login p. 11):
Table 1: RMC Controller Tree
Level 1
Level 2
Level 3
Level 4
ALA
Alarms
AAL
Active alarms
LOG
Log history
CLR
Clear log history
LOG
Login
Str
Start
On
Turn On
Off
Turn Off
RST
Reset Alarms
PAR
Parameters
GEN
General
StU
Setup
y01
ON/OFF
y05
Temperature units
y07
Restore default parameters
y08
Control sensor
y09
Control mode
ALA
Configuration
BUZ
Buzzer activation time
AdL
Alarm relay activation delay
AOF
Alarm relay active if unit in OFF
Ser
Serial Settings
Ser
Serial address (Modbus)
bAU
Serial baudrate (Modbus)
COM
Serial settings (Modbus)
PAS
Password
L01
Password level 1
L02
Password level 2
L03
Password level 3
CFG
Unit configuration
Set
Setpoint
c01
Pump flow delay
c02
Fan delay off
c03
T1-Pv filter
c04
Alarm difference
c05
Pump shutdown delay
c06
Min compressor speed
c07
Pump speed
c08
Compressor delay off
c09
Max pump speed
c10
Min pump speed
PID
PID Settings
P01
Regulation type
P02
Gain
P03
Integral time