12.2The Following Describes The Functions Of Each Of These Terminals And The Factory-Installed Options Required To Activate The Terminals:

Note: Terminal P1-P2are functional only when the water heater is equipped with the factory installed options required to activate the terminals. Terminals R1-R2, A1-A2,C1-C2and T1-T2are standard pre-wired functions on all models.

R1-R2:Used to activate /de-activate water heater from remote master control.

Terminals are wired to a relay in a remote Energy Management System. When relay closes, circuit from R1 to R2 is completed and appliance controls are enabled. Appliance ships from factory with jumper between terminals Remove jumper when connecting to a remote controller.

A1-A2:Used to activate a remote alarm, signaling shutdown of combustion control.

Provides a maximum 10 amp relay contact closure when the flame safeguard terminates combustion due to a tripped safety interlock (i.e.: air proving switch, high limit switch, low water flow switch or flame sensor, etc.).

P1-P2:Activates remote equipment and requires confirmation signal back to the appliance.

Provides a maximum 10-amp relay contact closure to activate a remote device (i.e.: mechanical room air louvers, draft inducer or power vent, etc.). The remote device must send return signal via proving switch to confirming proper operation to terminals C1-C2, prior to the appliance being able to energize. Options Required - Consult Factory.

C1-C2:Used for proving operation of remote device.

Terminals are wired to a proving switch on a remote device such as a power venter. When relay closes, circuit from C1 to C2 is completed and appliance controls are enabled. This appliance ships form the factory with jumper between terminals.

T1-T2:Used for external modulation control

To connect external modulation control, disconnect and cap the blue wire connected to terminal T2 and connect the external modulating signal to terminals T1 (positive) and T2 (negative).

13SEQUENCE OF OPERATION

1.Incoming 120VAC

a.Full time power to the Main Control Switch

b.Full time power to the Variable Frequency Drive

2.Power On - When the main control switch is turned on:

a.120v is applied to the step-down transformer (24v)

b.120v is applied to the L.W.C.O. terminal L1 (if used)

c.120v is applied to the Fenwal Flame Safeguard Control

d.24v is applied to the TempTrac operating temperature control terminal L1

3.Call For Heat - If the TempTrac operating control senses a call-for-heat condition:

a.The High Gas Pressure and Low Gas Pressure Switch (both optional) are energized and their safe condition is proved.

b.The thermostat contact on the Fenwal Flame Safeguard Control is energized.

c.The flame control will then verify the Airflow-Proving Switch is in the open position, which must exist before the blower is powered.

d.Energizing the blower should close the airflow proving switch. If the airflow-proving switch is not in the closed position, the flame control’s fan terminals F1-F2 will power the Variable Frequency Drive (VFD) blower system at low speed for pre-purge.

e.If the airflow-proving switch does not close following the blower being energized, the flame control will lockout.

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PVI Industries PV500-47C manual Sequence of Operation, Incoming 120VAC
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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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