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Siemens Industry, Inc.

POWERS

™

CONTROLS

Technical Instructions

Document No. 155-068P25

TH 193-4

February 14, 2022

Free Energy Band

TH 193 HC

Heating/Cooling Room Thermostat

Description

The TH 193 HC thermostats are proportional, dual output, dual setpoint, two-pipe (dual

one-pipe, low air capacity) or three-pipe (dual two-pipe, high air capacity) sensor

controllers. Each thermostat includes a wall mounting plate for installation in a variety of

rough-in terminal boxes. Sensitive bimetals respond to temperature changes to

modulate control air through a flapper nozzle. As the heating load decreases due to

internal heat gains, a dead band of control minimizes energy consumption while the

setpoint changes from 72°F (22C) heating mode to 78F (26C) cooling mode. Two

setpoint dials allow adjustment of the dead band 4F (2C) minimum. Air connections

are made with 5/32-inch (4 mm) O.D. plastic tubing, directly to the thermostat chassis

for retrofit applications or with plug-in adapters (provided with the TH 192 rough-in

terminal box or optional accessories), which slide into the wall mounting plate.

Features

• Direct and reverse acting for heating and cooling modes.

• Two separate, adjustable temperature setpoint indicating dials.

• Two highly sensitive bimetal thermostatic elements.

• Fahrenheit or Celsius models.

• Individual field adjustable sensitivity with graduated scale.

• Integral field adjustable limit stops.

• Control pressure test port accessible without removing cover.

• Easily replaceable thermometer, setpoint dials, filters and restrictor plate.

• Covers available for concealed or exposed thermometers, and for concealed

adjustment and setpoint indication.

• Standard plastic thermostat covers provide Desert Beige or white finish.

Summary of content (13 pages)

PAGE 1
Technical Instructions Document No. 155-068P25 TH 193-4 February 14, 2022 POWERS™ CONTROLS Free Energy Band® TH 193 HC Heating/Cooling Room Thermostat Description The TH 193 HC thermostats are proportional, dual output, dual setpoint, two-pipe (dual one-pipe, low air capacity) or three-pipe (dual two-pipe, high air capacity) sensor controllers. Each thermostat includes a wall mounting plate for installation in a variety of rough-in terminal boxes.
PAGE 2
Technical Instructions Document Number 155-068P25 February 14, 2022 Optional Design Features Application Free Energy Band TH 193 HC Heating/Cooling Room Thermostat • Fixed temperature limit stops meet government specifications. • Metal covers available in standard configurations with Desert Beige finish. • Competitor adapter mounting kits available.
PAGE 3
Free Energy Band TH 193 HC Heating/Cooling Room Thermostat Product Numbers and Ordering Information Chassis Technical Instructions Document Number 155-068P25 February 14, 2022 See Table 1 for product number and ordering information on TH 193 HC thermostat chassis. 1. Does the application require a one-pipe or two-pipe connection? a. One-pipe thermostats are low air capacity devices and have only one port connection (R1). This application requires an external restrictor. b.
PAGE 4
Technical Instructions Document Number 155-068P25 February 14, 2022 Covers Free Energy Band TH 193 HC Heating/Cooling Room Thermostat See Table 2 for product number and ordering information on TH 193 HC thermostat covers. 1. Is the setpoint adjustment exposed for customer adjustment or concealed to prevent alteration of setting? 2. Is the thermometer exposed or concealed? 3. Is the setpoint indication exposed or concealed behind cover? 4. Is a plastic or zinc cast metal cover required? a.
PAGE 5
Free Energy Band TH 193 HC Heating/Cooling Room Thermostat Specifications Accessories Control action Operating ranges Supply air pressure, maximum Normal air supply pressure Sensitivity adjustment Nominal air consumption One-pipe Two-pipe Temperature response Temperature Storage temperature Ambient operating temperature Dial graduations Factory settings Calibration @ 72°F (22°C) Sensitivity Limit stop adjustment Standard cover Shipping weight Dimensions See Table 1 45°F to 85°F (7°C to 30°C) 30 psi (207
PAGE 6
Technical Instructions Document Number 155-068P25 February 14, 2022 Free Energy Band TH 193 HC Heating/Cooling Room Thermostat Operation, Continued Figure 4. TH 193 HC Operating Characteristics. Figure 5. TH 193 HC Input/Output Characteristics. TH 193 HC Thermostat Details Figure 6. TH 193 HC Thermostat Details. Thermometer Calibration 1. Use a test thermometer to read the current room temperature. 2. Place a screwdriver in the center of the thermometer assembly (Figure 6).
PAGE 7
Free Energy Band TH 193 HC Heating/Cooling Room Thermostat Limit Stop Adjustment Technical Instructions Document Number 155-068P25 February 14, 2022 Thermostat limit stops define the minimum and maximum thermostat setpoints. The limit stops engage in the setpoint cam gear teeth and cause interference between the setpoint cam gear and the adjustment knob gear. To change limit stop settings, use needle nose pliers to pull the limit stop between the setpoint cam gear teeth.
PAGE 8
Technical Instructions Document Number 155-068P25 February 14, 2022 Free Energy Band TH 193 HC Heating/Cooling Room Thermostat Cooling Calibration Page 8 Step 1 — Remove the cover using the 192-632 Calibration Tool. Verify that the room temperature is between 70°F and 80F (2°C and 27C). Step 2 — Verify that the supply pressure is 18 to 25 psi (124 to 172 kPa). Set the cooling dial to room temperature by turning the exposed adjustment knob or using a hex key as shown.
PAGE 9
Free Energy Band TH 193 HC Heating/Cooling Room Thermostat Technical Instructions Document Number 155-068P25 February 14, 2022 Heating Calibration Siemens Industry, Inc. Step 1 — If not already done, remove the cover using the 192-632 Calibration Tool. Verify that the room temperature is between 70°F and 80F (21°C and 27C). Step 2 — Verify that the supply pressure is 25 psi (172 kPa). Set the heating dial to room temperature by turning the exposed adjustment knob or using a hex key as shown.
PAGE 10
Technical Instructions Document Number 155-068P25 February 14, 2022 Troubleshooting Free Energy Band TH 193 HC Heating/Cooling Room Thermostat Before troubleshooting thermostat (see Table 4), ensure that there is clean, dry supply air at 18 psi (124 kPa) minimum. Use the test probe gauge and needle adapter to measure the control pressure at the thermostat test port. The output pressure test port is accessible without removing the thermostat cover through the 8th opening from the top.
PAGE 11
Free Energy Band TH 193 HC Heating/Cooling Room Thermostat Chassis Tube Connector and Restrictor Plate Replacement Technical Instructions Document Number 155-068P25 February 14, 2022 1. Remove the thermostat chassis from the wall. The terminal does not have a ball check valve. NOTE: You must close off the supply air. For example, use a connector with the supply air terminal plugged. 2. Remove the two Phillips head screws from the connector on the back of the thermostat chassis.
PAGE 12
Technical Instructions Document Number 155-068P25 February 14, 2022 Service Parts Free Energy Band TH 193 HC Heating/Cooling Room Thermostat The following chart lists accessory parts and tools available for thermostat service.
PAGE 13
Technical Instructions Document No. 155-068P25 Free Energy Band TH 193 HC Heating/Cooling Room Thermostat February 14, 2022 Description Part Number Replacement thermometer kits, brown (packages of 5) Scale Range Thermostat Model 45°F to 85°F 192-786 10°C to 30°C 192-785 Models 1 and 2 Replacement setpoint dials (packages of 10) °F, Direct Acting °F, Reverse Acting 192-779 Right Side 192-780 Dimensions Figure 10. TH 193 HC Dimensions in Inches (Millimeters).