
14
309077
Installation
Check the Resistance Between the Supply
Unit and the True Earth Ground
WARNING
FIRE, EXPLOSION, AND ELECTRIC
SHOCK HAZARD
To reduce the risk of fire, explosion, or
electric shock the resistance between
the supply unit components and true
earth ground must be less than 0.25
ohms.
Have a qualified electrician check the resistance
between each supply unit component and the true
earth ground. The resistance must be less than 0.25
ohms. If the resistance is greater than 0.25 ohms, a
different ground site may be required. Do not operate
the system until the problem is corrected.
NOTE:
Use a meter that is capable of measuring
resistance at this level.
Checking Resistance
WARNING
ELECTRIC SHOCK HAZARD
Do not open the electrical control panel,
unless you are a trained professional.
Before opening the control panel, make sure that
all power has been removed from the control panel.
You can check the resistance of the supply unit’s heat
sensors and heaters.
Sensor Resistance Checks
WARNING
ELECTROCUTION HAZARD
To reduce risk of injury or damage to
equipment, conduct these electrical
checks with the main disconnect OFF.
The supply unit includes six heat sensors and control-
lers for each of the six heated zones. To check sensor
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
Schematics
on page 64 for wiring
diagram information.
3. Replace any parts whose resistance readings do
not comply with the ranges listed in the chart
below.
NOTE:
Check resistance at ambient room tempera-
ture (63
– 77
Fahrenheit
).
RTD Sensors
Zone Component Terminals Value Range
1
Follower
1321 &
1331
97.4 – 102.8 ohms
2
Dispense
Hose 1
1521 &
1531
97.4 – 102.8 ohms
2
Dispense
Hose 2
1661 &
1671
97.4 – 102.8 ohms
4
Pump
1391 &
1401
97.4 – 102.8 ohms
5
Dispense
Gun 1
1591 &
1601
97.4 – 102.8 ohms
6
Dispense
Gun 2
1731 &
1741
97.4 – 102.8 ohms
Summary of Contents for 309077
Page 9: ...9 309077 Typical Installation 4 Regulator Air Control Module Fig 2 O C D I A E B 9402A ...
Page 47: ...47 309077 Notes ...
Page 64: ...64 309077 Schematics 122 122 ...
Page 65: ...65 309077 Schematics 121 121 TEMPERATURE CONTROL TEMPERATURE CONTROL ...
Page 66: ...66 309077 Schematics 170 170 TEMPERATURE CONTROL TEMPERATURE CONTROL TEMPERATURE CONTROL ...
Page 68: ...68 309077 Schematics ...
Page 69: ...69 309077 Notes ...