Graco Therm-O-Flow 200 Instructions Manual page 19

Heater Resistance Checks.
To reduce risk of injury or damage to equipment, con-
duct these electrical checks with the main power dis-
connect OFF.
To check heater resistance:
1. Make sure the power is off and that the disconnect
switch is in the OFF position.
Zone Component
1 Platen
Zone Component Between Terminals
2 Pump T1/T3, T2/T3,
B1/B3, B2/B3
T1/T3, T2/T3,
B1/B3, B2/B3
Same
311208P
Table 2 Heaters
Between For Unit Voltage Platen Model Code
Terminals
AB, BC, CD, 220/240 VAC
DE, EF, FA
AB, BC, CD, 380/400 VAC
DE, EF, FA
470/490 VAC
AB, BC, CD, 570/590 VAC
DE, EF, FA
Any to GND
Table 3 Heaters
For Unit Voltage Platen Model Code
Any
380/400
470/490
570/590
2. Make electrical resistance checks for the compo-
nents. Refer to Electrical Schematics on page 52
for wiring diagram information.
3. Replace any parts whose resistance readings do
not comply with the ranges listed in Table 2 or Table
3.
Check resistance at ambient room temperature
°F) (
(63°– 77 17°– 25
Resistance Values (ohms)
BA 16.5Ω +1 / -2
BB, BC 19.5Ω +2 / -3
BA 16.5Ω +1 / -2
BB, BC 19.5Ω +2 / -3
BA 16.5Ω +1 / -2
BB, BC 19.5Ω +2 / -3
BA 16.5Ω +1 / -2
BB, BC 19.5Ω +2 / -3
100,000Ω Min
Any
BA
BB, BC
BA
BB, BC
BA
BB, BC
Installation Procedure
°C).
Resistance Values (ohms)
192.0 +/- 19.2Ω
19