Description - PENN Controls - LIT-1900864 - C450CCN - C450SBN - C450YNN - System 450 Multi-Purpose Modular Control System - C450CCN Standard Control Module Two Relay Outputs - C450SBN Expansion Module One Relay Output - C450YNN‐1 Power Module

Solar Heating Control Applications with Differential Temperature Control Application Note

Product name
C450CCN Standard Control Module Two Relay Outputs
C450SBN Expansion Module One Relay Output
C450YNN‐1 Power Module
Document type
Application Note
Document number
LIT-1900864
Revision date
2020-04-14
Important: Use the System 450™ control module only as an operating control. Where failure or malfunction of the System 450 control module could lead to personal injury or property damage to the controlled equipment or other property, additional precautions must be designed into the control system. Incorporate and maintain other devices, such as supervisory or alarm systems or safety or limit controls, intended to warn of or protect against failure or malfunction of the System 450 control module.

Refer to the System 450 Series Modular Control Systems with Standard Control Modules Technical Bulletin (LIT-12011459), the System 450 Series Modular Controls Product Bulletin (LIT-12011458), and the installation instructions for product specifications, detailed installation procedures, and important product safety information.

In this solar heating example, a solar panel circulating pump is controlled by differential temperature (diFT). When the temperature of the solar panel is 10F° above the temperature of the water in the storage tank, the solar panel circulating pump begins to run.

When the differential temperature (dON1) is met, the normally open contacts of relay output 1 close, energizing C2 and starting the circulating pump. The pump cycles off when the differential temperature (dOFF1) falls to 5F°. The room temperature circulating pump is controlled by the room temperature sensor (Sn-3) and the storage tank sensor (Sn-2).

When heating is required, the normally open contact on RelayOutput 2 (OUTR2) closes, energizing C1 and starting the room temperature circulating pump. Relay Output 3 (OUTR3) locks out the room temperature circulating pump if the water in the tank drops below 70°F, allowing the pump to restart when the water temperature rises to 75°F or higher.

Figure 1. System 450 Solar Heating Control Application with Differential Temperature Control Example

Figure 2. System 450 UI Status and Setup Screens for Solar Heating Control Applications