Trane Modular 20 to 35 Tons Parts List download pdf (Page 45)

PKG-PRC003U-EN 45

Controls

• STATUS is used to monitor all temperatures, pressures, humidities, setpoints, input and output

status.

• CUSTOM allows the user to customize a status report, which can consist of up to four screens

of data available in the main STATUS menu.

• SETPOINT is used to edit all factory preset default setpoints.

• DIAGNOSTICS allows the user to review active and historical lists of diagnostic conditions. A

total of 49 different diagnostics can be read at the human interface (HI) panel and the last 20

diagnostics can be held in an active history buffer log at the HI panel.

• SETUP allows the user to edit control parameters, sensor selections, setpoint source selections,

output definitions, and numerous other points in this menu. All points have factory preset

values to keep unnecessary editing to a minimum.

• CONFIGURATION allows changing of factory-preset unit configuration information.This

information can be edited only if certain options are field-installed or deleted from the unit. For

example, if aTracer LCI-I communication interface module or ventilation override module

(VOM) were field-installed, the unit configuration will require editing to reflect those options for

proper unit operation.

• SERVICE allows servicing or troubleshooting the unit by selecting component control outputs

such as compressors, fans, damper position, etc.This menu is accessible only at the unit-

mounted human interface panel.

Control Sequences of Operation

Morning Warmup

This feature is available on all types of factory-installed heat units and on units with no heat.This

function may still be selected to support systems with heat sources not provided by the self-

contained unit. At the conclusion of unoccupied mode, the selected zone is heated to the user-

defined morning warmup setpoint.The unit is then released to occupied mode.There are two types

of morning warmup: full capacity or cycling capacity.

Full Capacity Morning Warmup (MWU)

Full capacity morning warmup uses full heating capacity to heat the zone as quickly as possible.

Full heating capacity is provided until the morning warmup setpoint is met. At this point, the unit

is released to daytime mode.

Cycling Capacity Morning Warmup (MWU)

Cycling capacity morning warmup provides a more gradual heating to overcome “building sink”

as the zone is heated. Normal zone temperature control with varying capacity is used to raise the

zone temperature to the MWU zone temperature setpoint.This method of warmup is used to

overcome the “building sink” effect. Cycling capacity MWU will operate until MWU setpoint is

reached or for 60 minutes.Then the unit switches to occupied mode. Cooling will suspend until

building load conditions exceed the MWU setpoint of 3°F (1.7°C), which is field adjustable.

Note: When using the morning warmup option in a VAV heating/cooling self-contained unit,

airflow must be maintained through the self-contained unit.This can be accomplished by

electrically tying the VAV boxes to the unoccupied output relay contacts on the unit’s RTM

module or by using changeover thermostats. Either of these methods will assure adequate

airflow through the unit and satisfactory heating.

Ventilation Override (VOM)

The user can customize up to five different override sequences (A-E) for purposes of ventilation

override control. If more than oneVOM sequence is being requested, the sequence with the highest

priority is initiated first. Priority schedule is that sequence “A” (unit off) is first, with sequence “E”

(purge with duct pressure control) last.

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Trane Modular 20 to 35 Tons Parts List Page 45

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