Operation - PENN Controls - A19BAC - A28AA - Electromechanical Temperature Control - A19 Coiled Bulb Control - A28 and A36 Multi‐Stage Temperature Control

A19BAC, A28AA Single and Two-Stage Space Thermostats for Farm and General Purpose Applications Installation Guide

Brand
PENN Controls
Product name
A19 Coiled Bulb Control
A28 and A36 Multi‐Stage Temperature Control
Document type
Installation Guide
Part number
996-238
Document revision
F
Revision date
2019-03-07
Language
English

Figure 1 and Figure 2 illustrate the operation of the A19. On a temperature increase, the circuit between R and Y closes. Simultaneously the R and B circuit opens.

Figure 3 illustrates the operation of the A28AA. On a temperature increase, the circuit between R and Y of the low stage switch (RYL) closes. Simultaneously, the circuit between R and B (RBL) opens.

Figure 1. Exterior view of Space Thermostat A19

On a further increase in temperature, the high stage switch operates and closes RYH while simultaneously opening RBH.

The reverse sequencing takes place on a temperature fall.