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Heater Resistance Checks
WARNING
ELECTROCUTION HAZARD
To reduce risk of injury or damage to
equipment, conduct these electrical
checks with the main disconnect OFF.
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 Control Panel Component
Layout in Graco form 309085 for wiring diagram
information.
Table 1. Check Heater Resistance on 2-Zone Control (243698)
Zone
Component
1
DH Hose/Aux
2
DH Gun/Aux
Table 2. Check Heater Resistance on 4-Zone Control (243699)
Zone
Component
1
DH Hose/Aux
2
DH Gun/Aux
3
DH Hose/Aux
4
DH Gun/Aux
Table 3. Therm-O-Flow Plus Gun/Aux Heater Resistance Values
Resistance Values
Watts
(ohms) at 240 VAC
200
400
400*
500
Table 4. Therm-O-Flow Plus Hose Heater Resistance Values – 50 watts/foot
Length/ft.
6
10
15
20
25
Installation
288
+30/–40
144
+14/–20
144
+14/–20
115
+12/–16
Resistance Values
(ohms) at 240 VAC
288
+30/–40
144
+14/–20
144
+14/–20
115
+12/–16
115
+12/–16
3. Replace any parts whose resistance readings do
not comply with the ranges listed in Tables 3 and
4.
NOTE: Check resistance at ambient room tempera-
F).
ture (63_ – 77_
Use the following tables for the appropriate zone
control. Resistance values of the heating elements for
the various 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.
Between
Terminals
1232 & 1050
Refer to Tables 3 and 4 for resistance
Refer to Tables 3 and 4 for resistance
values for the device connected
1262 & 1050
Between
Terminals
2063 & 1061
2082 & 1061
Refer to Tables 3 and 4 for resistance
Refer to Tables 3 and 4 for resistance
values for the device connected
2103 & 1061
2122 & 1061
Therm-O-Flow Plus
Gun/Aux Device
Gun, Automatic and Manual
Compensator
Manifold
Header
Resistance Values
(ohms)
Resistance Values
(ohms)
309213
13
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