4.Proof of Air Pressure Switch - The control will look for a signal from the airflow-proving switch, indicating that the blower is operating:

a.When the airflow generated by the blower is sufficient to cause the differential air switch to close, the 15 - second pre-purge delay will start.

b.During this period any flue products or combustible gases which may have settled in the water heater are evacuated.

5.Heat-Up- Following the pre-purge delay, the hot surface igniter will be energized:

a.The flame control will monitor the current applied to the hot surface igniter.

b.If the flame control determines the proving current meets the threshold, a dwell time delay starts to assure the hot surface igniter has sufficient time to reach ignition temperature.

6.Ignition - When dwell time is completed a 4-second Trial for Ignition (TFI) period is initiated:

a.The Delay-On (Low Fire Hold) Relay and the Gas Safety Valves are energized.

b.During TFI the flame safeguard control will monitor the flame using flame rectification through the hot surface igniter.

c.If the flame control senses the presence of flame before the end of the TFI period, the igniter will be de- energized and the flame control will continue to monitor the flame, through the igniter, until the operating thermostat ends the call for heat condition.

7.Loss of Flame Signal

a.If the igniter fails to sense flame at any time, the igniter and gas valve will be de-energized and the flame control will reset and begin the call-for-heat sequence again. This will occur 3 times (one time if CSD-1) before the flame control will lockout.

b.When the call for heat condition ends or flame failure occurs following the third TFI period (one time if CSD- 1), a 30-second post-purge period will begin. This period of blower operation will exhaust any remaining combustion products from the system.

8.Delay-On Relay - Once the Delay-On (Low Fire Hold) Relay has timed out, it energizes the Modulation Release Relay (SPDT) to enable the analog signal from the TempTrac to the VFD to regulate the speed of the blower.

a.The TempTrac will continue to monitor the stored water temperature in the tank.

b.When the setpoint temperature is reached the call-for-heat signal to the flame safeguard control is discontinued.

c.The flame safeguard control deenergizes the VFD blower system and the gas valve, thereby suspending burner operation.

d.As heat is transferred to the building, the water heater loop temperature will fall below the set point. The TempTrac will sense this condition and begin the call-for-heat sequence again.

9.Flame Safeguard LED Diagnostic Indicator - If the Fenwal Flame Safeguard Control at any time during the operating sequence senses an improper operating state and locks out, the diagnostic red LED located on the control board will flash to indicate one of the following conditions exist:

LED INDICATION

FAULT MODE

On

Normal Operation

OFF

Internal Control Failure – check power

1

Flash

Airflow Fault

 

 

 

2

Flashes

Erroneous Flame Signal

3

Flashes

Ignition Lockout

4

Flashes

Hot Surface Igniter Fault

 

 

 

5

Flashes

Low Voltage (24 VAC)

6

Flashes

Valve Relay Problem

 

 

25

PV500-47C 06/12

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PVI Industries PV500-47C manual Loss of Flame Signal, LED Indication Fault Mode
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PV500-47C specifications

PVI Industries has established itself as a leading name in the manufacturing of innovative water heating solutions. Among its diverse product lineup is the PV500-47C, a well-regarded commercial water heater that exemplifies efficiency, reliability, and advanced technology. Designed for a variety of applications, the PV500-47C is particularly suitable for large commercial institutions, including hotels, hospitals, and educational facilities.

One of the standout features of the PV500-47C is its robust construction and high storage capacity. With a tank capacity of 500 gallons, it is designed to accommodate the high-demand hot water needs of large settings. The unit is engineered using resilient materials that provide long-lasting performance while also resists corrosion, ensuring the integrity of the tank over time.

The PV500-47C incorporates advanced heating technologies to improve energy efficiency. Its innovative design includes a highly efficient insulated tank that minimizes heat loss, allowing it to maintain water temperatures effectively. The water heater is typically powered by extensive heat exchangers that maximize energy transfer from the heating source to the water, which can help reduce energy costs and improve overall operational efficiency.

In addition, the PV500-47C boasts a state-of-the-art electronic control system that enables precise temperature management. This feature enhances not only safety but also the efficiency of the heating process, allowing users to program specific temperatures and schedules according to their operational needs. The unit also includes multiple safety features, such as high-temperature limit switches to prevent over-temperature situations, contributing to the overall safety of the water heating system.

Another notable characteristic of the PV500-47C is its ease of installation and maintenance. The unit is designed with accessibility in mind, allowing for straightforward installation in various commercial settings. Regular maintenance is simplified thanks to its accessible components, which makes it easier for technicians to service the system, ensuring minimal downtime.

In summary, the PVI Industries PV500-47C is a highly efficient and dependable solution for commercial water heating needs. Its impressive features, advanced technologies, and user-friendly design make it an optimal choice for businesses that require consistent hot water supply while managing energy costs effectively. This makes the PV500-47C not just a water heater, but an integral asset to any large-scale operation.
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