Installation
311513D
9
Heater Resistance Checks
To check heater resistance:
1.
Make sure the power is off and that the disconnect
switch is in the OFF position.
2.
Make electrical resistance checks for the compo-
nents. Refer to your Therm-O-Flow manual for wir-
ing diagram information.
3.
Replace any parts whose resistance readings do
not comply with the ranges listed in Tables 3 and 4.
Use the following tables for the appropriate zone control.
Resistance values of the heating elements for the vari-
ous devices vary by length and/or type. If the resistance
values are not within the indicated range, reference the
appropriate device manual for further information.
Overview of Temperature Controller
Settings
Temperature controls are set in the zone configuration
setup screens. See Run Screens in your Therm-O-Flow
manual for information about setting temperature con-
trols.
P, I, and d settings are preset for device types and will
not need to be changed. Refer to the Zone Setup
Screens in your Therm-O-Flow manual for a list of
device types and how to set them for each zone.
Check resistance at 63-77°F (17-25°C).
Table 3: Check Heater Resistance, 4-Zone Control
Zone
Component
Between
Terminals
Resistance
Values,
ohms
1
DH Hose/
Auxiliary
1134 &
1142
See Table 4
and Table 5
for
resistance
values for
the device
connected.
2
DH Gun/
Auxiliary
1162 &
1142
3
DH Hose/
Auxiliary
1192 &
1142
4
DH Gun/
Auxiliary
1222 &
1142
Table 4: Gun/Auxiliary Heater Resistance Values
Device
Watts
Resistance
Values, ohms at
240 Vac
Gun, automatic or
manual
200
288, +30/- 40
Compensator
400
144, +14/- 20
Manifold
400
144, +14/- 20
Heater
500
115, +12/- 16
Table 5: Hose Heater Resistance Values (50 Watts/ft)
Length, ft (m)
Resistance Values,
ohms at 240 Vac
6 (1.83)
288, +30/- 40
10 (3.05)
144, +14/- 20
15 (4.57)
144, +14/- 20
20 (6.10)
115, +12/- 16
25 (7.62)
115, +12/- 16
Table 4: Gun/Auxiliary Heater Resistance Values
Device
Watts
Resistance
Values, ohms at
240 Vac