Lochinvar 150 - 500 service manual Sequence of operation

Page 9

 

 

 

Service Manual

 

 

 

 

 

1 Service (continued)

 

 

 

Sequence of operation

 

 

 

Table 1A Sequence of operation

 

 

 

 

 

 

 

OPERATION

 

DISPLAY

 

 

 

 

1. Upon a call for heat, the control turns on the water heater pump.

WHR: Standby

 

 

 

OUT: 123.8F(129)

 

2. The control connects 120 VAC to the blower. The blower does not

 

 

 

run at this time.

 

 

 

• If the unit is equipped with a flow switch, it must close before the

 

 

 

control powers up the blower.

 

 

 

• The manual reset high limit must be closed before the control

WHR: Standby

 

powers up the blower.

 

OUT: 123.8F(129)

 

• If the unit is equipped with a solenoid valve and/or a vent

 

valve, they will be energized along with the blower.

 

 

 

• If the unit is equipped with a gas pressure switch, it must close

 

 

 

at this time.

 

 

 

• If there is an auxiliary device connected to the unit, the unit

 

 

 

will then provide 24 VAC to its enable relay. If the auxiliary

 

 

 

device has a proving switch, it must close before the

 

 

 

sequence continues.

 

 

 

 

 

 

3. The control then starts a 10 second prepurge cycle.

WHR: PREPURGE

 

 

 

OUT: 123.9F(129)

 

4. Once the prepurge cycle is complete, and the blocked drain

WHR: IGNITION

 

switch is closed, the control starts the 5 second trial for ignition by

 

sending spark voltage to the spark electrode and opening the gas

OUT: 123.9F(129)

 

valve.

 

 

 

 

 

5. If the control does not detect flame by the end of the trial for

 

 

 

ignition, the control performs a 10 second postpurge, another

WHR: POSTPURGE, PREPURGE

 

prepurge and tries to light the burner again. If the burner does

 

not light after 4 trials (1 trial on the 500 model), the control locks

OUT: 123.9F(129)

 

out for 1 hour and then tries another set of 4 trials, except on

 

the 500 model which is manual reset lockout.

 

 

 

 

 

 

 

6. If the control detects a flame before the trial for ignition ends, it

WHR: WHR 20% RATE

 

begins to modulate the burner in order to maintain the set point.

 

 

 

OUT: 124.8F(129)

 

 

 

 

 

7. Once the call for heat is satisfied, the control will turn off the burner.

WHR: POSTPURGE

 

The blower will remain on for the 10 second postpurge cycle. The

 

water heater pump will continue to run for its pump delay time,

OUT: 127.4F(129)

 

then turn off.

 

 

 

 

8. Water heater pump off.

WHR: Standby

 

 

 

OUT: 124.7F(129)

 

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Contents Models 150 Contents Please read before proceeding Handling ceramic fiber materialsNiosh stated First Aid Service What is in this manual?Maintenance TroubleshootingArmor water heater display ServiceControl inputs Control outputs How the water heater operates General OperationSequence of operation Saving parametersSequence of operation Use this procedure to access menus from the display panel Display panel menu accessButton Operation Display Comments Display panel parameter accessWHR Parameter tableNot used Data logging Viewable and changeable control parametersWHR settings FunctionsNot used Control modes Circulation pumps Service NotificationMaintenance Maintenance and annual startup Service technicianOwner maintenance Maintenance Check water system Flue vent system and air pipingCheck expansion tank Check water heater relief valveCheck all water heater wiring Check ignition ground wiringCheck control settings Perform start-up and checksCleaning water heater heat exchanger Check flame signalReview with owner Oiled bearing circulatorsBefore troubleshooting TroubleshootingCheck control module fuses Check the followingNo Burner No DisplayOperation Unit Does NotTemperature F Resistance Ω Checking temperature sensorsNo Pump Noisy OperationRelief Valve OpeningFlame Flow SwitchSequence GV/RelayNo Flame Ign Running No FlameHigh Limit Manual ResetFan Low Fan Speed LowFan Speed High Fan HighSensor Open Sensor ShortedRem Ctrl Flt ParametersProgr Watch Dog Error Service BlkNo Error Stored Low 24 VACGas Valve Adjustment Combustion Analysis ProcedureOr Obstruction Gas Supply PressureGas valve adjustment procedure Models 150Model Page

150 - 500 specifications

Lochinvar has established itself as a leader in the field of hydronic heating solutions, and the Lochinvar 150 - 500 series is a prime example of its commitment to innovation and efficiency. Designed primarily for commercial applications, this line of high-efficiency boilers is engineered to provide optimized performance, reliability, and cost-effectiveness.

One of the standout features of the Lochinvar 150 - 500 series is its robust construction. Built with a durable stainless-steel heat exchanger, these boilers offer superior resistance to corrosion, ensuring a longer lifespan and consistent performance over time. The advanced design of the heat exchanger also maximizes heat transfer, contributing to higher efficiency ratings.

In terms of technology, the Lochinvar 150 - 500 series incorporates the Concentric Venting System, which allows for flexible installation options and reduces the overall footprint required for the boiler setup. This system is particularly advantageous in commercial settings where space can be limited. The boilers are equipped with smart controls that provide real-time monitoring and diagnostics, allowing for easier maintenance and reducing downtime.

The series features a comprehensive modulation range, allowing the boilers to adjust their output based on the heating demand. This capability not only enhances efficiency but also lowers energy consumption, making it an eco-friendly choice for businesses seeking to reduce their environmental impact. The Lochinvar 150 - 500 boilers utilize innovative combustion technologies, including an integrated burner that ensures optimal combustion efficiency and reduced emissions.

Safety is a priority with the Lochinvar 150 - 500 series, which includes multiple safety features such as lockout protection, pressure switches, and high-temperature limit controls. These measures ensure that the unit operates safely under varying conditions, providing peace of mind for operators.

Additionally, the compact design of the Lochinvar 150 - 500 series allows for easy transportation and installation. Its lightweight structure enables it to be maneuvered through tight spaces typically found in commercial buildings, making it a versatile option for installers.

In summary, the Lochinvar 150 - 500 series is an excellent choice for anyone seeking a reliable, efficient, and technologically advanced boiler solution. With its durable construction, advanced features, and commitment to safety and efficiency, this series stands out as a trusted option in the competitive market of hydronic heating systems.
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