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Table of Contents
POWERS
TH 356 LIMITEM
Thermostat
Description
Features
Product Numbers
Application
®
®
Rigid Bulb
The TH 356 Rigid Bulb LIMITEM
either as direct acting or reverse acting in a variety of ranges.
•
Copper motor tube and invar steel rod sensing element
•
Two-valve design eliminates wasting of air
•
18-inch (457 mm) bulb useful where stratification occurs
•
Flange, locknut and screws for duct mounting included
Product
Number
356-0750
356-0012
356-1005
356-1006
100 to 250°F (38 to 121°C)
356-0013
The 356 Rigid Bulb LIMITEM is recommended for use in controlling duct air
temperatures such as mixed air or discharge air. It can also be used as a high or low
temperature limit control. In unit ventilator applications it is used as a low limit control.
When used with a well, it can be used for water temperature control.
®
is a pneumatically operated thermostat available
Table 1.
Operating Range
30 to 180°F (-1 to 82°C)
0 to 100°F (-18 to 38°C)
30 to 180°F (-1 to 82°C)
0 to 100°F (-18 to 38°C)
Technical Instructions
Document No. 155-070P25
Action
Direct
Acting
Reverse
Acting
TH 356-1
March 10, 2015
Siemens Industry, Inc.
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Related Manuals for Siemens POWERS LIMITEM TH 356
Summary of Contents for Siemens POWERS LIMITEM TH 356
- Page 1 It can also be used as a high or low temperature limit control. In unit ventilator applications it is used as a low limit control. When used with a well, it can be used for water temperature control. Siemens Industry, Inc.
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Page 2: Specifications
Figure 2. Reverse Acting Operation. Operation The copper motor tube and invar steel rod average temperature changes by measuring the difference in expansion between the two metals. This positions the two-valve mechanism in response to the slightest temperature changes. Page 2 Siemens Industry, Inc. - Page 3 Return line vent, factory set for 5 to 7 CIM (1.37 to 1.91cm /s), prevents the air being trapped in the line when the Limitem is piloted from a room thermostat. Siemens Industry, Inc. Page 3...
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Page 4: Installation
3. Remove the standard mounting flange from the Limitem. 4. Carefully thread the LIMITEM through the 3/8-inch NPT tapped swivel socket. 5. Fasten the flange to the duct with the sheet metal screws provided. The installation is now complete. Page 4 Siemens Industry, Inc. - Page 5 1. Remove the cover. To Change Setpoint 2. Turn the dial adjustment screw with a screwdriver to change to the desired setpoint. See Figure 5 Figure 6. Using the Pressure Test Port. Figure 5. LIMITEM Cover Removed. Siemens Industry, Inc. Page 5...
- Page 6 5. Make sure that the dial adjustment screw point touches the sensitivity spring. 6. Recalibrate the unit. 7. If you need to adjust again, allow five minutes for the control cycle to settle before repeating the steps above. Page 6 Siemens Industry, Inc.
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Page 7: Troubleshooting
Move the sensitivity spring to a more gradual rapidly (lower number) slot setting. See Sensitivy Adjustment. Temperature wanders Sensitivity setting Improper setting Move the sensitivity spring to a more positive from control point (higher number) slot setting. See Sensitivity Adjustment. Siemens Industry, Inc. Page 7... - Page 8 Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design improvements are introduced. POWERS and LIMITEM are registered trademarks of Siemens Industry, Inc. Other product or company names mentioned herein may be the trademarks of their respective owners.
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