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Technical Instructions
Document Number 155-064P25
April 1, 2005
Specifications
Operating
Physical
Page 2
Control action
Direct acting only
Reverse acting only
Operating range
Operating pressure
Sensitivity range
(12 to 65 kPa per degree C)
Factory sensitivity setting
(28 kPa per degree C)
Temperature response
Maximum ambient temperature
Case
Bulb
Scale graduations
Normal air supply pressure
Air usage
*HC, 40 scim restrictor
DA, 40 scim restrictor
RA, 20 scim restrictor
Air capacity
*HC, 40 scim rest.
*HC, 40 scim rest. cooling
DA, 40 scim restrictor
RA, 20 scim restrictor
Thermal system
*HC air usage and air capacity is the same for Powers, Honeywell, and Johnson.
Weight 3 lbs. (1.36 kg)
Dimensions
Air connections
Finish
Table 2. Air Supply Pressure and Changeover.
Type & Model
Heating (DA)
No.
Powers HC
25 Psi (172 kPa) 18 psi (124 kPa)
TH 188 HC
25 psi (172 kPa)
Powers DA
TH 188D
Powers RA
TH 188R
18 psi (124 kPa)
Honeywell HC
Lp916Bxxxx
Johnson HC
20 psi (138 kPa)
T-3300-2
Heating (DA) and Cooling (RA)
60° to 85° F (16° to 29° C)
30 psi (207 kPa) max.
1 to 5.25 psi per degree F
2.25 psi per degree F
0.2° F (0.1° C)
135°F (57°C)
231°F (111°C)
1°F (0.55°C)
See Table 2
45 scim (12 ml/s)
40 scim (11 ml/s)
25 scim (7 ml/s)
35 scim (9.5 ml/s)
120 scim (33 ml/s)
35 scim (9.5 ml/s)
120 scim (33 ml/s)
Remote bulb, liquid filled
See Figure 9
Barbed fitting for 1/4-inch (6.4 mm)
OD plastic tubing
Corrosion resistant zinc chromate
Cooling (RA)
--
--
25 psi (172 kPa)
13 psi (90 kPa)
15 psi (103 kPa)
TH 188 Unit Mounted Thermostat
Changeover
21 psi (145 kPa)
--
--
15 psi (103 kPa)
17 psi (117 kPa)
Siemens Industry, Inc.
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