Sunlife Enterprises DM240, DM300, DM180 GAS Valve Piping, GAS Heating Operation Errors

Page 40

356214-XIM-A-0108

When the thermostat calls for the first stage of heating, the low-voltage control circuit from "R" to "W1" and "G" is completed, thru the UCB. The heat relay "RW1" is energized. The "RW1-2" contacts close energizing the draft motor control. The draft motor control contacts close and start the draft motor. As the speed of the draft motor reaches approximately 2500 RPM, the cen- trifugal switch contact, located on the end of the draft motor shaft, closes to power the first stage ignition module "IC1", thru the "RW1-1 contacts.

Ignition module "IC1" will immediately start the first stage igniter sparking and will open the redundant valve located inside the first stage main gas valve "GV1" to allow a flow of gas to only the first stage carry- over tube. Only after the pilot flame has been ignited and the presence of pilot flame detected at the "IC1" by a signal sent back through the flame sensor is sparking terminated and the first stage main gas valve opened.

Gas flows into each of the main burners and is ignited from the carryover tube flame.

After completing the specified fan on delay for heating, the UCB will energize the blower motor.

If "IC1" fails to detect a pilot flame, it will continue to try for a maximum of 85 seconds to ignite the pilot tube. If the pilot flame is not detected, then "IC1" will lock out first stage furnace operation for five minutes or until 24V power is removed from the module either at the unit or by resetting the room thermostat.

When the thermostat calls for the second stage of heating, the low-voltage control circuit from "R" to "W2" is completed, thru the UCB. Heat relay "RW2" is ener- gized. The "RW2-1" contact is closed energizing the second stage ignition module "IC2". "IC2" will immedi- ately start the second stage igniter sparking and will open the redundant valve located inside the second stage main gas valve "GV2" to allow a flow of gas to the second stage carryover tube. Only after the pilot flame has been ignited and the presence of pilot flame detected at "IC2" by a signal sent back through the flame sensor is sparking terminated and the main gas valve opened.

Gas flows into each of the second stage main burners and is ignited from the carryover tube flame.

If "IC2" fails to detect a pilot flame, it will continue to try for a maximum of 85 seconds to ignite the pilot tube. If the pilot flame is not detected, then "IC2" will lock out first stage furnace operation for five minutes or until

24V power is removed from the module either at the unit or by resetting the room thermostat.

NOTE: That the second stage furnace can operate even if first stage has locked out.

When the thermostat satisfies de-energizing the "RW2"and "RW1", thus opening all gas valves. The blower motor will continue to run after the furnace is shut down until the specified fan off delay for heating has been satisfied. The UCB will de-energize the blower motor.

REDUNDANT

 

MAIN VALVE

VALVE

 

 

GAS MAIN

 

GAS

 

TO MAIN

VALVE

TO PILOT BURNER

BURNER

 

 

FIGURE 19 - GAS VALVE PIPING

When the thermostat calls for the first stage of heating, the low-voltage control circuit from "R" to "W1" is com- pleted. A call for heat passes through the UCB to the ignition control board (ICB). The UCB monitors the "W1" call and acts upon any call for heat. Once voltage has been sensed at “W1”, the UCB will initiate the fan on delay for heating, energizing the indoor blower after the specified delay has elapsed.

When the thermostat has been satisfied, heating calls are ceased. The GV is immediately de-energized. The blower is de-energized after the fan off delay for heat- ing has elapsed. The draft motor performs a 25-second post purge.

GAS HEATING OPERATION ERRORS

TEMPERATURE LIMIT

If the UCB senses zero volts from the high temperature limit, the indoor blower motor is immediately energized. When the UCB again senses 24 volts from the temper- ature limit, the draft motor will perform a 25-second post-purge and the indoor blower will be de-energized following the elapse of the fan off delay for heating.

This limit is monitored regardless of unit operation sta- tus, i.e. the limit is monitored at all times.

40

Johnson Controls Unitary Products

Page 39 Page 41
Image 40
Page 39 Page 41
Contents Installation Table of Contents List of Figures List of TablesSafety Considerations GeneralInspection ReferenceRenewal Parts ApprovalsProduct Nomenclature Ton Sunline & Magnum & MagnaDRY Model Number NomenclatureInstallation Safety Information InstallationLimitations Unit Application Data LocationRigging and Handling ClearancesDuctwork Fixed Outdoor AIR Intake DamperService Access FiltersField Wiring DM ELECTRIC/ELECTRIC and GAS/ Electric Units Power and Control Wiring Control Wire SizesThermostat Electric Heat Application Data Optional Electric HeatOptional GAS Heat GAS Heat Application DataGAS Piping 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 Static RESISTANCES1 Power Exhaust PerformanceBlower Motor and Drive Data Phasing Checking AIR Supply CFMIWG Drop Pressure Nominal CFM Thousands Supply AIRSequence of Operations Overview OperationCooling Sequence of Operation LOW-PRESSURE Limit Switch Safety Controls ResetCompressor Protection Flash CodesHeating Operation Errors Limit Control SettingHeat Anticipator Setpoints Electric Heat Anticipator SetpointsGAS Heating Operation Errors GAS Valve PipingGAS Valve START-UP Cooling START-UP GAS Heat Shut DownPRE-START Check List POST-START Check List GASManifold GAS Pressure Adjustment Burner AIR Shutter AdjustmentBurner Instructions Checking GAS InputTroubleshooting Adjustment of Temperature RiseCooling Troubleshooting Guide 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.
Top Page Image Contents