System
Figure 37. Discharge Duct Sensor 6RT2 & 6RT3 “Temperature vs Resistance” Curve
(Ohms) | 4200 |
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4000 |
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3800 |
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Resistance |
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3600 |
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3400 |
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| 3483 ± 10 Ohms @ |
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3200 |
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| 77O F (25O C) |
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3000 |
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20 | 40 | 60 | 80 | 100 | 120 | 140 | 160 | 180 | 200 | 220 | ||
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| (4.4oC) | (15.6oC) | (26.7oC) | (37.8oC) (48.9oC) (60.0oC) | (71.1oC) (82.2oC) (93.3oC) | (104.4oC) | ||||||
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| Temperature - OF (OC) |
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EVP Chiller Control Checkout (Honeywell W7100G)
Note: The following checkout procedure must be performed in its entirety and in the sequence given.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.
The W7100G (6U11) chilled water controller can be checked out using a highly accurate digital volt- ohmmeter, the W7100 accessory tool kit (Trane part #
1.Verify that the main power disconnect switch and the control circuit switch 1S2, in the unit control panel, is “OFF”.
2.At the unit control panel, unplug the reset relay 1K11 and 1K12, (1K12 used on 40 through 60 Ton units only). Refer to the connection diagram that shipped with the unit for the location of the relay(s).
3.At the Chilled Water controller (6U11) inside the remote panel, disconnect the sensor (6RT2) leads form Terminals T & T1.
4.Remove the 3,400 ohm resistor (blue leads) from the test kit and connect it across Terminals T and T1 to simulate a discharge air temperature of 60ºF.
5.Remove the
6.To simulate a call for maximum reset, remove the jumper from Terminals 6 & 7 and install the 1780 ohm resistor (red leads), from the test kit, across Terminals 6 and 7.
7.Install a jumper across the P1 and P2 Terminals (remote setpoint input).
8.Remove the red dust cover from the test plug socket at the bottom of the W7100G. Insert the “Test Plug”, from the kit, into the test plug socket. The test plug overrides most of the
9.Set the “Reset F” dial at 20ºF and the “Setpoint F” dial at 10ºF
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