Graco Therm-O-Flow 200 Instructions-Parts List Manual page 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.
Check resistance at 63-77°F (17-25°C).
Table 3: Check Heater Resistance, 4-Zone Control
Zone Component
1 DH Hose/
Auxiliary
2 DH Gun/
Auxiliary
3 DH Hose/
Auxiliary
4 DH Gun/
Auxiliary
Table 4: Gun/Auxiliary Heater Resistance Values
Device
Gun, automatic or
manual
Compensator
Manifold
311513D
Resistance
Between Values,
Terminals ohms
1134 & See Table 4
1142 and Table 5
for
1162 &
resistance
1142
values for
1192 &
the device
1142
connected.
1222 &
1142
Resistance
Values, ohms at
Watts 240 Vac
200 288, +30/- 40
400 144, +14/- 20
400 144, +14/- 20
Table 4: Gun/Auxiliary Heater Resistance Values
Device
Heater
Table 5: Hose Heater Resistance Values (50 Watts/ft)
Length, ft (m)
6 (1.83)
10 (3.05)
15 (4.57)
20 (6.10)
25 (7.62)
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.
Installation
Resistance
Values, ohms at
Watts 240 Vac
500 115, +12/- 16
Resistance Values,
ohms at 240 Vac
288, +30/- 40
144, +14/- 20
144, +14/- 20
115, +12/- 16
115, +12/- 16
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