Trane RAUJ-C20, Installation, Operation And Maintenance Manual

Page: 101 / 132

SS-SVX11K-EN 101
N No otte e:: Before condemning the sensor, verify that
the connecting cable resistance is not
excessive. Refer to the “Field Installed
Control Wiring” section.
5. Make all necessary repairs and reconnect the duct
sensor lead to terminal T1 on the controller.
6. Turn all control switches to the “ON” position and
restore power to the system.
Master Energy Control Checkout
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1. Open the system control switches 5S1 and 5S2 to
disable the Evaporator Fan and Heating system.
2. Verify that the main power disconnect switch and
the control circuit switch 1S2, in the unit control
panel, is “OFF”.
3. At the Master Energy Controller (7U11), in the unit
control panel, remove at least one wire from each
of the “Heat Relay” normally open contacts and
one from each of the “Cool Relay” normally open
contacts. Insulate the wires with tape to prevent
shorting or grounding during control checkout.
4. Close the main power disconnect switch and turn
the control circuit switch 1S2, in the unit control
panel, “ON”.
W WA AR RN NIIN NG G
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5. At the Master Energy Controller, use a digital
voltmeter to verify that there is 20 volts DC power
between terminals 1 (N) & 2 (+20). Refer to the
illustration in Discharge Air Controller Checkout
(Honeywell W7100A) section for terminal
identification.
N No otte e:: The wires that are still connected to one side
of the “Cool Relay” contacts, are active with
115 volts applied. Measuring the contacts
when only one wire is connected will not
cause any damage to the ohmmeter.
However, do not try to ohm any set of
contacts with wires connected to both
terminals of that contact.
6. To verify the “Heating” output relays are operating;
a. place a jumper between Terminals 2 (+20) & 5
(H).
b. place the ohmmeter leads across each set of
normally open “Heat Relay” contacts. The
ohmmeter should read “Resistance” which
indicates that the heating output relays have
“pulled in”.
7. To verify the “Cooling” output relays are operating;
a. Remove the jumper from Terminals 2 (+20) & 5
(H) and reinstall it between Terminals 2 (+20) &
4 (C).
b. Place the ohmmeter leads across each set of
normally open “Cool Relay” contacts. The
ohmmeter should read “Resistance” which
indicates that the cooling output relays have
“pulled in”.
8. With all of the “Cooling Output” relays pulled in
(step 7), measure the DC voltage across Terminals
R (-) and W (+). The measured voltage should be
approximately 1.7 to 2.1 VDC.
9. Remove the jumper installed between Terminals 2
(+20) & 4 (C).
10. Measure the voltage again across Terminals R (-)
and W (+). The measured voltage should now be
approximately 0.2 VDC.
11. Turn the control circuit switch 1S2, in the unit
control panel, to the “OFF” position.
12. Remove the wires from Terminals R, B, W, & Y.
13. Measure the resistance across the following pairs of
terminals and compare the actual resistance
readings with the values shown below:
MEC Terminals Resistance (ohms)
R-to-W 226
R-to-B 432
R-to-Y 226
14. Reconnect the economizer leads W, R, B and Y to
the appropriate terminals on the controller.
15. Turn switches 1S2, 5S1, & 5S2 to the “ON” position
to restore power to the control system.
P Prre e--S Stta arrtt