Maintenance
Service Failure
Measure the voltage between terminals
Clogged Filter = Approximately 32 VDC.
Normal = Less than 1 VDC, approximately 0.75 VDC
Fan Failure = voltage alternates between 32 VDC & 0.75 VDC.
To use LED's for quick status information at the unit, purchase a ZSM and connect wires with alligator clamps to terminals 6 through 10.
Connect each respective terminal wire (6 through 10) from the Zone Sensor to the unit J6 terminals 6 through 10.
Note: If the system is equipped with a programmable zone sensor THS03, the LED indicators will not function while the ZSM is connected.
Resetting Cooling and Ignition Lockouts
Cooling Failures and Ignition
Lockouts are reset in an identical manner. Method 1 explains resetting the system from the space, Method 2 explains resetting the system at the unit.
Note: Before resetting Cooling Failures and Ignition Lockouts, check the Failure Status Diagnostics by the methods previously explained.
Diagnostics will be lost when the power to the unit is disconnected.
Method 1
To reset the system from the zone, turn the "Mode" selection switch at the zone sensor to the "Off" position.
After approximately 30 seconds, turn the "Mode" selection switch to the desired mode, i.e. Heat, Cool or Auto.
Method 2
To reset the system at the unit, cycle the unit power by turning the disconnect switch "Off" and then "On".
Lockouts can be cleared through the building management system. Refer to the building management system instructions for more information.
Zone Temperature Sensor (ZTS) Service Indicator
The ZSM SERVICE LED is a generic indicator that will signal the closing of a Normally Open switch at any time, providing the Indoor Motor (IDM) is operating. This indicator is usually used to indicate a clogged filter, or an air side fan failure.
The RTRM will ignore the closing of this Normally Open switch for 2 (±1) minutes. This helps prevent nuisance SERVICE LED indications. The exception is the LED will flash 40 seconds after the fan is turned "On" if the Fan Proving Switch is not made.
Clogged Filter Switch
This LED will remain lit the entire time that the Normally Open switch is closed. The LED will be turned off immediately after resetting the switch (to the Normally Open position), or any time that the IDM is turned "Off".
If the switch remains closed, and the IDM is turned "On", the SERVICE LED will be turned "On" again after the 2 (±1) minute ignore delay.
This LED being turned "On", will have no other affect on unit operation. It is an indicator only.
Fan Failure Switch
When the "Fan Failure" switch is wired to the RTOM, the LED will remain flashing the entire time the fan proving switch is closed, indicating a fan failure, and it will shut the unit operations down.
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