Penn T19PC Series Installation Manual

T19PC Series Temperature Controls with Type 4X Raintight Enclosures
Installation Guide
Application
Important: Use the T19PC series temperature
control only to control equipment under normal
operating conditions. Where failure or malfunction
of the T19PC 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 T19PC.
T19PC series electromechanical temperature
controls are designed for use in many agricultural
applications. T19PC controls have rugged
polycarbonate enclosures and are UL listed as
Type 4X and for use in National Electrical Code
(NEC) Article 547 Agricultural Environments
(ANSI/NFPA 70). See Figure 1 and Technical
Specifications.
Adjustable T19PC series temperature controls have
O-ring sealed external setpoint adjustment knobs
and range scales with oversized markings for easy
readability in low light. The exposed portion of the
liquid expansion sensing elements has been tested
to the standard of Article 547 of the NEC.
Important: Do not dent, bend, uncoil, or
otherwise alter the position of the sensing
element, also known as the coil, mounted on the
base of the control. If you damage the sensing
element, you could change the control calibration
and you void any warranties on the control.
Operation
When the temperature at the sensing element
rises to the setpoint, which you can view as the
dial setting, the switch between R and Y closes,
and the switch between R and B opens on single-
pole double-throw (SPDT) models. See Figures 2,
3, and 4.
Installation
Figure 1: Dimensions for T19PC temperature
controls with Type 4X enclosures, in. (mm)
Mounting
Mount the temperature control on a wall where
it is exposed to the average temperature of the
controlled space. Do not mount the control where
unusual heat or cold can affect it, such as directly
over an animal stall or in sunlight. Avoid locations
near a door, window, or other sources of non-
ambient air drafts. Do not mount the control on an
outside wall or where temperature at the sensing
element exceeds 140°F (60°C).
To mount the temperature control to a flat surface,
insert screws through the holes in the T19PC's
mounting tabs. See Figure 1.
Wiring
Risk of Electrical Shock.
To avoid the risk of electrical
shock, disconnect all power sources to the control
before wiring any connections. More than one
disconnect may be required to completely de-
energize the control and equipment.
Important: All wiring must conform to all local,
national, and regional regulations. Use copper
conductors only for all wire connections.
Important: Do not use T19 temperature controls
on applications where the electrical load across
the control's switch may exceed the electrical
ratings shown on the temperature control's label.
Important: Use only the terminal screws supplied
with the switch. Using other screws in the switch
voids the warranty, could damage the switch,
and could cause problems with making secure
connections.
The T19PC Type 4X enclosure features three
1/2 in. trade-size conduit knockouts. To make
wiring connections:
1. Loosen the four cover screws and remove
the cover and knob assembly. Do not remove
the knob: it is secured in the cover. Do not
damage the O-ring seal.
2. Select the knockout that you want to remove.
3. Place a screwdriver blade on the knockout
near the edge.
4. Apply a sharp blow to the screwdriver handle
to loosen the knockout.
5. Connect an approved watertight conduit
fitting to the conduit.
6. Connect the fitting to the T19PC control
enclosure.
Note: For flexible conduits, you can reverse
Step 5 and Step 6.
7. Insert the wire through the conduit opening.
8. Make the wiring connections to the screw
terminals. See Figures 2, 3, and 4.
9. Ensure that the enclosure O-ring is securely
seated in the groove so that it forms a
correct seal between the cover and case.
Part No. 996-536, Rev. E
Issue Date: December 2022
10. Replace the cover and knob assembly.
11. Check the alignment of the range adjustment
knob.
Figure 2: Standard wiring for heating applications
Figure 3: Standard wiring for cooling applications
Figure 4: Standard wiring for combination heating
and cooling applications