Product Overview

Technical Instructions TH 134 Pneumatic High and Low Temperature Detection Thermostats
Document Number 155-063P25
April 1, 2005
Page 4 Siemens Industry, Inc.
Mounting and
Installation
Low Temperature
Detection
General Guidelines
• Locate the sensing element in the downstream side of the coil.
• Install as much of the bulb as possible in a horizontal plane. If too much of the bulb is
vertical, it will not operate properly.
• Locate the case and bellows where the ambient temperature is always warmer than
the bulb and capillary environment.
• Install the thermostat so that the reset button is readily accessible and the element
bellows point down.
• Avoid sharp bends or kinks in the sensing element.
Large Walk-in Ducts
(Figure 6)
1. Attach the mounting bracket to the thermostat using the two round head screws
provided.
2. Mount the two perforated steel strap hangers inside the duct with the wide part of the
hanger strap parallel to the air flow.
3. Drill a hole in the side of the duct. With the bulb still coiled, thread the bulb through
the hole using a rotary movement.
4. Mount the thermostat on the duct.
5. Carefully uncoil the bulb avoiding sharp bends or kinks in the sensing element.
6. Mount the bulb in a horizontal serpentine manner. Attaching the bulb to the strap as
shown in the detail in Figure 6.
The installation is now complete.
For an alternate method of mounting, use coil clips (part no. 356-115) in the coil fins to
hold the bulb in a horizontal serpentine pattern.
Figure 6. Typical Mounting in Large Walk-in Ducts.