Lochinvar 502 - 2072, 402 - 2072 service manual Anti-cycling

Page 19

Copper-fin II/IIE Boiler, Water Heater and Pool Service Manual

1 Service (continued)

F6: Outdoor air shutdown differential

The outdoor air shutdown differential parameter is the number of degrees below parameter F5 the outdoor air temperature must go before the unit will respond to a SH demand. This parameter can be changed by the user or the installer by accessing parameter F6. The temperature range of this parameter is 0°F (0°C) to 90°F (50°C). The default value is 10°F (5°C).

F7: Shift reset curve

The shift reset curve parameter shifts the actual set point above or below the calculated set point the number of degrees in this parameter. This parameter can be changed by the installer by accessing parameter F7. The temperature range of this parameter is -27°F (-15°C) to 27°F (15°). The default value is 0°F (0°C). This feature will be active if this parameter is set to anything other than 0°F (0°C).

F8: Boost temperature

If a SH demand lasts longer than the programmed time delay setting (F9) and there have been no DHW demands, the control will increase the SH set point by the amount in this parameter. If the SH demand continues through another time period, the set point will be increased again. This will continue until either the SH demand ends, a maximum of 20 increases has occurred, or the SH user set point has been reached. Once the SH demand has been satisfied the set point will revert back to its calculated setting. The boost temperature can be changed by the installer by accessing parameter F8. The temperature range of this parameter is 0°F (0°C) to 45°F (25°C). The default value is 0°F (0°C). This feature will be active if this parameter is set to anything other than 0°F (0°C).

F9: Boost time

The boost time parameter sets the amount of time that must elapse with a SH demand before the water temperature set point will be increased. This parameter can be changed by the installer by accessing parameter F9. The time range for this parameter is 1 minute to 250 minutes. The default value is 20 minutes.

G: Anti-cycling

G1: Anti-cycle delay

Once a SH demand has been satisfied, a set amount of time must elapse before the control will respond to a new SH demand. The control will block the new heat demand and anti-cycling will be shown in the display until the time has elapsed or the water temperature drops below parameter G2. This parameter can be changed by the installer by accessing parameter G1. The time range for this parameter is 0 minutes to 40 minutes. The default value is 1 minute.

G2: Anti-cycle override differential

The control will bypass the anti-cycling time if the water temperature drops too quickly. The control will use the water temperature at the time it shut off as the starting point.

If the temperature drops below the temperature parameter the control will abort anti-cycling and allow the unit to fire. This parameter can be changed by the installer by accessing parameter G2. The temperature range of this parameter is 0°F (0°C) to 54°F (30°C). The default value is 10°F (5°C).

G3: Ramp delay enable

When the ramp delay on/off parameter is active, the ramp delay limits the boiler firing rate when a SH cycle has started. There are six (6) limiting steps used to limit temperature overshoot and short cycles, see FIG. 1-2 on page 19 of this manual. This feature can be turned on or off depending on the installation. This parameter can be changed by the installer by accessing parameter G3. The control range of this parameter is 0 = Off, 1 = Ramp Up Only, and 2 = Ramp Up and Ramp Down. The default value is 0.

G4: Ramp delay settings

When ramp delay is active, there are up to six (6) limiting steps, as described above in Ramp Delay On/Off. Each step has its own time period and modulation limit. The installer can adjust these settings by accessing parameter G4. The settings for each step are displayed as follows:

G4 Ramp n

mm minutes ppp.p%

Where n is the number of the step, mm is the length of time in that step, and ppp.p is the maximum firing rate allowed during that step. Upon selecting this parameter, the ramp number n will be flashing. Use the UP and DOWN keys to select the step you wish to adjust. Use the NEXT and PREVIOUS keys to select the setting you wish to adjust. Use the UP and DOWN keys to adjust the value of each setting.

NOTE THAT THE FIRING RATE LIMIT IN STEP 6 WILL APPLY THROUGHOUT THE ENTIRE CALL FOR HEAT. If 100% rate is required, the rate limit in step 6 must be 100%. The default values are 2 minutes at 50% for step 1, 1 minute at 80% for step 2, and 1 minute at 100% for steps 3 through 6.

G5: Minimum on / off stages 1, 3

Whenever Stage 1 or Stage 3 (if used) starts or stops, a timer is started. This timer must expire before that stage can turn off or back on. To adjust this time delay, access parameter G5. The range of this parameter is 0 to 255 seconds. The default value is 60 seconds.

G6: Delay between stages 1, 3

Whenever Stage 1 or Stage 3 (if used) turns on, a timer must expire before another Stage 1 or 3 can turn on, whether in the same heater, or in another heater in a Cascade. To adjust this time delay, access parameter G6. The range of this parameter is 0 to 255 seconds. The default value is 60 seconds.

19

Page 18 Page 20
Image 19
Page 18 Page 20
Contents Copper-fin II/IIE Boiler, Water Heater Pool Heater Contents Handling ceramic fiber materials Please read before proceedingNiosh stated First Aid Troubleshooting What is in this manual?Service MaintenanceCopper-fin display ServiceControl inputs Control outputs Sequence of operation General OperationHow the appliance operates How the control module operatesOUT 123.8F129 Sequence of operationHTR Postpurge Display panel menu access Display panel parameter access Parameter table Functions Settingsdhw ResetoutdoorAnti-cycle Delay Yes Viewable and changeable control parameters Temperature settings boiler onlyFunctions Data loggingDHW settings Outdoor air reset boiler only Anti-cycling Control modes Cascade Building Management System BMSCirculation pumps Service NotificationSee the User’s Information Manual for instructions Maintenance Maintenance and annual startupService technician Owner maintenanceMaintenance Inspect/replace hot surface igniters Check relief valve Inspect/replace hot surface igniterPerform start-up and checks Check all wiringCheck control settings Inspect and clean burnerChecking combustion air pressure Access to the burner will require the following stepsChecking manifold gas pressure Adjusting combustion air pressureValve Fitting Control Knob Review with owner Inspect and clean the heat exchangerOiled bearing circulators Check the following TroubleshootingBefore troubleshooting Check control module fusesUnit Does Not No DisplayNo Burner OperationResistance Temperature Checking temperature sensorsTemperature Resistance DHW Pump NoisyNo Pump Boiler Pump System PumpFlame Sequence Flow SwitchAnti-cycling Flame CKT ErrorNo Flame Ign HSI Current LowHigh Limit Auto ResetNo Flame RunningSensor Shorted Manual ResetInlet Low Sensor OpenAPS Closed Louver ProvingTank Open APS OpenRem Ctrl Flt Temp O/ShootLow Voltage Service BlkParameters ProgrProgram EEProm Watch Dog ErrorNo Error Stored Write EEProm
Related manuals
Manual 44 pages 7.23 Kb Manual 44 pages 18.25 Kb Manual 80 pages 43.41 Kb

502 - 2072, 402 - 2072 specifications

The Lochinvar 402 - 2072 is a versatile and highly efficient boiler designed to meet the heating demands of modern residential and commercial applications. This model stands out due to its innovative technologies, advanced features, and a high level of reliability, making it an ideal choice for consumers looking for an enduring and economical heating solution.

One of the primary characteristics of the Lochinvar 402 - 2072 is its impressive energy efficiency. With an exceptional annual fuel utilization efficiency (AFUE) rating, this boiler ensures minimal energy waste, allowing homeowners and business operators to save significantly on their energy bills. The model incorporates advanced condensing technology that enables it to extract heat from the combustion gases, maximizing heat transfer and reducing emissions.

The Lochinvar 402 - 2072 is built with a robust stainless steel construction that enhances durability and resilience against corrosion and other environmental factors. This material not only prolongs the lifespan of the unit but also contributes to its outstanding thermal efficiency. Additionally, the boiler's compact design allows for flexible installation options, making it suitable for various spaces, including tight utility rooms and basements.

Equipped with a user-friendly control interface, the Lochinvar 402 - 2072 allows for easy monitoring and adjustment of settings. Its advanced digital display provides real-time data on system performance, ensuring the operator can maintain optimal performance and efficiency.

Another noteworthy feature is the unit's quiet operation. The design includes sound-dampening insulation and high-efficiency circulators, keeping noise to a minimum, which is an essential trait for both residential and commercial settings.

The Lochinvar 402 - 2072 is also designed with safety in mind. It incorporates multiple safety features including an automated vent damper, low water cutoff, and a comprehensive control system that monitors various operating conditions. This proactive approach to safety ensures that potential issues are identified and addressed before they become critical.

In conclusion, the Lochinvar 402 - 2072 boiler presents an exceptional combination of efficiency, durability, and user-friendly features. Its advanced condensing technology, stainless steel construction, and focus on safety make it a leading choice in the competitive boiler market, catering to the heating needs of a diverse range of applications while ensuring environmental responsibility. For those in search of a dependable and efficient heating solution, the Lochinvar 402 - 2072 is certainly worth considering.
Top Page Image Contents