PENN COMMERCIAL REFRIGERATION
TEMPERATURE CONTROLS
MECHANICAL THERMOSTATS
A28
2-STAGE CAPILLARY AND SPACE THERMOSTAT , IP30 / IP65
IP30
Controls are compact with fixed differential per stage and ( on most models ) adjustable differential between stages . Liquid filled element provides wide range ,
IP65 constant differential over whole range and no influence from barometric pressure . Since the bulb contains the major portion of the total fill the thermostat may by considered as cross-ambient , capillary and cup temperature variations affect the operating point only slightly due to the small amount of fill they contain .
For quantity orders it is possible to have the below stated optional constructions :
■ Without case and cover for panel mounting
■ Close differential per stage
■ Different capillary lengths All standard IP30 enclosure models have a universal way of adjustment . For this purpose a knob and sealing cap are enclosed .
FEATURES
• Liquid filled sensing element
• Dust tight Penn switch
• IP65 protection class models available
• Front adjustment
APPLICATION
These thermostats are designed for various types of heating , cooling , ventilation , or air-conditioning applications . All models have two SPDT switches providing the following control possibilities :
■ 2 stage heating
■ 2 stage cooling
■ Heating / cooling with automatic changeover
12 - REFRIGERATION
European Products Catalogue 2021