A28 switch action - PENN Controls - LIT-125125 - A28G - Electromechanical Temperature Control - A28 and A36 Multi-Stage Temperature Control

A28G Series Two-Stage Temperature Controls Without Enclosure Product Bulletin

Product name
A28 and A36 Multi-Stage Temperature Control
Document type
Product Bulletin
Document number
LIT-125125
Revision date
2023-08-09

On A28 models, when the temperature rises to the dial setting, the circuit opens between red (R) and blue (B) of the low stage terminal (RBL). Simultaneously, the circuit closes between R and yellow (Y) of the low stage terminal (RYL). When the temperature rises further, the high-stage RB switch opens (RBH). Simultaneously, the high-stage RY switch closes (RYH). The reverse sequence occurs when the temperature falls. The differential is above the setpoint. See the following figure:

Figure 1. A28AK switch action
Callout Description
1 Temperature rise
2 Temperature fall
3 Low stage
4 High stage