Sunlife Enterprises DM180, DM300, DM240 Safety Controls, Compressor Protection, Flash Codes, Reset

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356214-XIM-A-0108

Should a freezestat open three times within two hours of operation, the UCB will lock-out the associated com- pressor and flash a code (Table 24). If the other com- pressor is inactive, the condenser fans will be de- energized.

LOW AMBIENT COOLING

To determine when to operate in low ambient mode, the UCB has a pair of terminals connected to a temper- ature-activated switch set at 30ºF. When the low ambi- ent switch is closed and the thermostat is calling for cooling, the UCB will operate in the low ambient mode.

Low ambient mode operates the compressors in this manner: 10 minutes on, 5 minutes off. The indoor blower is operated throughout the cycle. The 5-minute off period is necessary to defrost the indoor coil.

Low ambient mode always begins with compressor operation. Compressor minimum run time may extend the minutes of compressor operation. The defrost cycle will begin immediately following the elapse of the mini- mum run time.

When operating in low ambient mode, the UCB will not lockout the compressors due to a freezestat trip. How- ever, a freezestat trip will de-energize the associated compressor. If the call for cooling is still present at the end of the ASCD and the freezestat has closed, the unit will resume operation.

SAFETY CONTROLS

The unit control board monitors the following inputs for each cooling system:

1.A suction line freezestat to protect against low evaporator temperatures due to a low airflow or a low return air temperature, (opens at 26 ± 5 °F and resets at 38 ± 5°F).

2.A high-pressure switch to protect against exces- sive discharge pressures due to a blocked con- denser coil or a condenser motor failure, (opens at 380 ± 10 psig and resets at 300 ± 10 psig).

3.A low-pressure switch to protect against loss of refrigerant charge, (opens at 22 ± 5 psig and resets at 45 ± 5 psig).

The above pressure switches are hard-soldered to the unit. The refrigeration systems are independently mon- itored and controlled. On any fault, only the associated system will be affected by any safety/preventive action.

The other refrigerant system will continue in operation unless it is affected by the fault as well.

The unit control board monitors the temperature limit switch of electric heat units and the temperature limit switch and the gas valve of gas furnace units.

COMPRESSOR PROTECTION

The compressors also have inherent (internal) protec- tion. If there is an abnormal temperature rise in a com- pressor, the protector will open to shut down the compressor. The UCB incorporates features to mini- mize compressor wear and damage. An anti-short cycle delay (ASCD) is utilized to prevent operation of a compressor too soon after its previous run. Addition- ally, a minimum run time is imposed any time a com- pressor is energized.

The ASCD is initiated on unit start-up and on any com- pressor reset or lock-out.

FLASH CODES

The UCB will initiate a flash code associated with errors within the system. Refer to UNIT CONTROL BOARD FLASH CODES Table 24.

RESET

Remove the call for cooling, by raising thermostat set- ting higher than the conditioned space temperature. This resets any pressure or freezestat flash codes.

ELECTRIC HEATING SEQUENCE OF OPERATIONS

The following sequence describes the operation of the electric heat section.

Single-stage heating (applies only to 18 KW heater, all other heaters MUST use a two-stage thermostat):

a.Upon a call for heat by the thermostat, the heater contactor (6M) will be energized. After completing the specified fan on delay for heating, the UCB will energize the blower motor.

b.The thermostat will cycle the electric heat to satisfy the heating requirements of the conditioned space.

Two-stage heating (applies to all heaters except 18 KW):

a.Upon a call for first-stage heat by the thermostat, the heater contactor (6M) (6M & 7M on 72 KW, 240V) will be energized. After completing the specified fan

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Johnson Controls Unitary Products

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Contents Installation Table of Contents List of Figures List of TablesInspection Safety ConsiderationsGeneral ReferenceRenewal Parts ApprovalsProduct Nomenclature Ton Sunline & Magnum & MagnaDRY Model Number NomenclatureLimitations InstallationInstallation Safety Information Unit Application Data LocationRigging and Handling ClearancesDuctwork Fixed Outdoor AIR Intake DamperService Access FiltersField Wiring DM ELECTRIC/ELECTRIC and GAS/ Electric Units Thermostat Power and Control WiringControl Wire Sizes Electric Heat Application Data Optional Electric HeatGAS Piping Optional GAS HeatGAS Heat Application Data Pipe SizingExternal Supply Connection External SHUT-OFF Vent and Combustion AIR Hoods Vent and Combustion AIR HoodOptional Power EXHAUST/BAROMETRIC Relief Damper Rain Hood Enthalpy Setpoint Adjustment Four and SIX Point Loads Physical Data ModelsDM Electrical Data -WITHOUT Powered Convenience Outlet SizeDM Electrical Data -WITH Powered Convenience Outlet Front View Rear View Dimensions Unit Clearances and Rain Hood Dimensions 15, 20 & 25 TON Altitude Correction Factors AIR Temp Altitude MeterALTITUDE/TEMPERATURE Conversion Factor High Static Drive CFM 80 m3/s 30 m3/s 10 m3/s 40 m3/s 1030 378 321 258 199 134 1070 417 361 299 240 XIM-A-0108 DM300 Unit Downflow Duct Connections CFM Blower Motor and Drive Data Power Exhaust PerformanceStatic RESISTANCES1 Phasing Checking AIR Supply CFMIWG Drop Pressure Nominal CFM Thousands Supply AIRCooling Sequence of Operation OperationSequence of Operations Overview LOW-PRESSURE Limit Switch Compressor Protection Safety ControlsReset Flash CodesHeat Anticipator Setpoints Heating Operation ErrorsLimit Control Setting Electric Heat Anticipator SetpointsGAS Heating Operation Errors GAS Valve PipingGAS Valve START-UP Cooling PRE-START Check List START-UP GAS HeatShut Down POST-START Check List GASBurner Instructions Manifold GAS Pressure AdjustmentBurner AIR Shutter Adjustment Checking GAS InputCooling Troubleshooting Guide TroubleshootingAdjustment of Temperature Rise GAS Rate Cubic Feet PER HourXIM-A-0108 XIM-A-0108 XIM-A-0108 XIM-A-0108 GAS Heat Troubleshooting Guide XIM-A-0108 Unit Flash Codes Unit Control Board Flash Codes Unit Control BoardUnit Control Board Option Setup Option Byte SetupXIM-A-0108 Johnson Controls Unitary Products Johnson Controls Unitary Products York Drive Norman, OK

DM300, DM240, DM180 specifications

Sunlife Enterprises has made significant strides in the competitive market of digital management tools with their innovative lineup of products: the DM240, DM300, and DM180. Each of these devices has been engineered to cater to specific operational needs while sharing a common foundation of advanced technology, versatility, and user-centric design.

The DM240 is an entry-level model that caters to small businesses looking for an efficient digital management solution without the hefty price tag. With a compact design and intuitive user interface, the DM240 allows for seamless integration into various work environments. Key features include a high-resolution touchscreen display, which facilitates easy navigation and quick access to essential functions. The device supports wireless connectivity options, ensuring users can manage tasks from anywhere within their operating environment. The energy-efficient design of the DM240 also promotes sustainability without compromising performance.

Moving up the line, the DM300 offers enhanced capabilities for medium-sized enterprises. This model is powered by advanced processing technology, allowing for faster data handling and superior multitasking. The DM300 features expanded memory and storage options, ensuring that users can manage larger datasets effortlessly. Additionally, with built-in advanced security features like biometric authentication and encrypted data storage, businesses can ensure that sensitive information remains protected. The intuitive software interface of the DM300 is designed for ease of use while providing advanced analytics tools to enable users to make data-driven decisions.

At the top of the range is the DM180, a sophisticated solution tailored to large organizations with complex digital management needs. The DM180 showcases a state-of-the-art design with high-performance computing capabilities. It features an expansive multi-touch display, allowing multiple users to interact simultaneously, facilitating collaboration and teamwork. The DM180 is equipped with cloud integration options, promoting real-time data access and sharing among teams, regardless of location. Its scalability ensures that businesses can adapt the system to accommodate growth without compromising functionality. Moreover, it offers comprehensive reporting and analytics tools, empowering organizations to gain valuable insights into their operations.

In summary, Sunlife Enterprises’ DM240, DM300, and DM180 models stand out for their unique features designed to meet the evolving needs of businesses. With a focus on user experience, performance, and security, these devices are poised to help organizations enhance productivity and drive innovation in the digital management landscape.
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