TM 5-3895-374-24-2
Table 2
Voltage
Service
Capacitance (mF)
(nonpolarized)
120 VAC
Resistance
None Required
240 VAC
Resistance
0.1
120 VAC
Relays
0.001 to 0.01
240 VAC
Relays
0.001 to 0.01
15-25 VAC
Relays
0.02
120 VAC
Motor
Use Relay
240 VAC
Motor
Use Relay
TESTING AND ADJUSTMENT
The arrow on the head of the controller indicates the
direction to turn the adjusting screw to increase the
temperature setting. Each full turn of the adjusting
sleeve will change the temperature the approximate
amount shown in Table 3.
After the controller has been installed, allow the
controller to operate for several cycles to permit the
controlled system to stabilize. Then adjust to the desired
temperature. Check the setting by cooling the system to
ambient temperature, re-heating it, and rechecking the
temperature. Where extremely accurate control is
desired,
several
adjustments
may
be
necessary.
However, once adjusted, the accuracy of the setting will
be maintained.
TESTING TEMPERATURE SET POINT
The set point temperature is the temperature at which the
contacts on a THERMOSWITCH Controller just "make"
(close). All controllers are set at room temperature [75
15°F (24 8°C)] unless ordered with a specific factory
setting (MOD 3).
Testing the temperature set point in an application, under
conditions where the heat source is remotely located from
the controller, or when ambient temperature conditions are
far below or above 75°F (240C), may give misleading
results. In some cases, this has led to rejection of
controllers that were within proper setting tolerance. If you
require temperature set point testing, Fenwal recommends
using our Model 80001-0 Test Kit. If you choose to build
you own test equipment, we recommend that you contact
your Fenwal representative for guidance in setting up a
good thermal test system.
Table 3
Tension Operated
Compression Operated
Catalog
Number
Approx.
F° Per Full
Turn of
Adj.
Sleeve
Catalog
Number
Approx.
F° Per Full
Turn of
Adj.
Sleeve
-
-
13121-1
1000
15050 to 16051
165
-
-
17000 to 17352
80-115
17021 to 17323
70-100
17800
125
17821
75
17802
160
17823
90
18000 to 18002
80-100
18021 to 18023
75-90
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