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11

Unit Operation

In Occupied mode, the controller 
operates according to the occupied 
setpoints. In Occupied Standby 
Mode, the unit controller operates 
according to the Occupied Standby 
setpoints. When the controller 
receives a communicated 
unoccupied request, the controller 

operates according to the 
unoccupied setpoints regardless of 
the state of the hardwired 
occupancy input.

If neither the binary input nor the 
communicated input is used to 
select the occupancy mode, the 

controller defaults to occupied 
mode because the occupancy binary 
input (if present) typically is 
configured as normally open 
without an occupancy device 
connected.

Table 4

: Normally open hardwired input configuration (BI 3)

Description

Communicated Request

Hardwired State

Result

Standalone

NA

Open = Occupied

Occupied

Standalone

NA

Closed = Unoccupied

Unoccupied

Communicating

Occupied

Open = Occupied

Occupied

Communicating

Unoccupied

Open = Occupied

Unoccupied

Communicating

Occupied Standby

Open = Occupied

Occupied Standby

Communicating

Occupied

Closed = Occupied Standby

Occupied Standby

Communicating

Unoccupied

Closed = Occupied Standby

Unoccupied

Communicating

Occupied Standby

Closed = Occupied Standby

Occupied Standby

Generic Binary Input

Building automation systems can 
monitor the status of the generic 
binary input. This input does not 
affect controller operation.

High and Low Pressure
Switches

The high and low pressure cutout 
switches are wired in series with the 
compressor contactor in the unit. 
The ZN510 controller detects the 
state of each switch circuit by 
monitoring the controller’s 
compressor triac outputs. If either 
the high pressure switch (HPC) or 
the low pressure switch (LPC) switch 
opens, a fault condition occurs. This 
open circuit prevents the 

compressor contactor from 
energizing keeping the compressor 
from running. The controller 
automatically detects the fault 
condition by measuring the 
compressor triac output signal.

By default, when the HPC or LPC 
switches detect a high or low 
pressure condition in the refrigerant 
circuit, the special input detects the 
diagnostic and disables all 
compressor operation for that 
circuit. The unit fan continues to 
operate, if only one circuit is 
disabled in a two compressor unit. 
When the HPC/LPC diagnostic is 
present on both circuits, the ZN510 
shuts off the unit fan and disables 

unit operation. See 

Figure 7

 for high 

and low pressure switch.

When the refrigerant circuit returns 
to normal, the HPC and the LPC 
switches automatically reset. The 
high or low pressure cutout 
diagnostic may need to be manually 
reset to clear the diagnostic and 
enable compressor operation for the 
fault circuit.

Note:
If configured for normally closed, all states are opposite of Table 4.

Содержание Tracer ZN510

Страница 1: ...WSHP IOP 2 May 1998 Installation Operation and Programming Tracer ZN510 Controller...

Страница 2: ...Related Literature z CNT IOP 1 ZN510 1 Controller Installation Operation and Pro graming z WSHP PD 1 Water Source Heat Pump Controller Product Data Sheet z WMCA PD 1 ZN510 Loop Con troller Product Dat...

Страница 3: ...on 7 Power 8 Binary Outputs 8 Analog Outputs 9 Binary Inputs 9 Analog Inputs 12 Zone Sensors 15 Heating or Cooling Control Mode Operation 18 Single or Dual Compressor Operation 19 Data Sharing 20 Conf...

Страница 4: ...place in the ZN510 IOP on a copy of Sheet 6 of this document or on building plans for future location use The actual room location on the tag may be hand written Zone Sensor Placement Zone sensor loc...

Страница 5: ...l minutes to check for the presence of a com municated value 3 A random start time is hard coded on every board and cannot be disabled The board generates a random time delay between 0 and 25 seconds...

Страница 6: ...mber The NID is similar to the serial number of the unit but is specific to the identification of the ZN510 Board The location identification is a customer defined clear English description of the uni...

Страница 7: ...system Communication is also possible with Trane s service tool Rover ZN510 provides a total of six 1 4 inch quick connect terminals for connection to the Comm5 communication link These connections in...

Страница 8: ...air damper It may be field modified to control a generic output for control by a building automation system If set up as a generic output the controller does not use BOP 6 as part of the normal contr...

Страница 9: ...ion Circuit 2 Table 2 Binary input configurations Binary Input Description Configuratio n Contact Closure Contact Open BI 1 Low Temperature Detection Cir 2 Normally closed Normal Diagnostic BI 2 Conde...

Страница 10: ...to page 28 on how to reset a unit z If BOP 6 is configured as a generic binary output the state of the output is not affected by the low temperature detection diagnostic or by other diagnostics Conden...

Страница 11: ...or the status of the generic binary input This input does not affect controller operation High and Low Pressure Switches The high and low pressure cutout switches are wired in series with the compress...

Страница 12: ...roller includes an automatic diag nostic reset function that allows the controller to automatically recover after a high or low pres sure cutout diagnostic After 30 minutes the con troller will reset...

Страница 13: ...In the occupied mode the unit attempts to maintain the space temperature at the active occupied heating or cooling setpoint based on the measured space temperature the active setpoint and the proporti...

Страница 14: ...ing water temperature is less than the leaving water temperature low limit the controller generates a Low Temp Detect diagnostic If the Leaving Water Temp Sensor fails to open or close the controller...

Страница 15: ...operation Table 5 Methods of setpoint operation Method Situation used Zone Sensor with an adjustable hardwired setpoint A hardwired adjustable setpoint is connected to the controller Local setpoints a...

Страница 16: ...t signal of OFF or AUTO If the fan control request is communicated to the controller the controller ignores the hardwired fan switch input and uses the communicated value The zone sensor fan switch si...

Страница 17: ...ion z External setpoint z ON and CANCEL buttons z Communication jack z Vertical case with Trane logo Part Number X13510635010 Description z Space temperature 0 2 C resolution z External setpoint z Fan...

Страница 18: ...only changes state when the controller turns on compressor 1 When a power failure occurs the reversing valve output defaults to the heating de energized state To reduce noise due to refrigeration mig...

Страница 19: ...verride the controller applies the occupied heating and cooling setpoint but reports the effective occupancy mode as occupied bypass mode In the occupied bypass mode a building automation system can d...

Страница 20: ...setpoint For this application each communicating controller uses the same setpoint ON CANCEL ZONE SET COMMMUNICATION 24V SERVICE ZONE SENSOR POWER BINARY IN PUTS FAN Actual Size 4 0 x5 5 ANALOG INPUT...

Страница 21: ...switch hardwired Enabled Setpoints Unoccupied cooling setpoint 85 F Occupied standby cooling 78 F Occupied cooling setpoint 74 F Occupied heating setpoint 71 F Occupied standby heating 67 F Unoccupie...

Страница 22: ...usly The controller is not detecting any communication Normal for standalone applications LED blinks The controller detects communication normal for communicating applications including data sharing L...

Страница 23: ...h ZN510 Loop Controller During Unoccupied the pumps will be OFF but should be energized to test compressor operation The user must override the pumps either at the ZN510 Loop Controller or by pushing...

Страница 24: ...heating or cooling to the space Fan mode off When a local fan mode switch determines the fan operation the off position controls the unit fan off Requested mode off The desired operating mode such as...

Страница 25: ...ressor may not work correctly No power to the controller If the controller does not have power the compressor does not operate For the ZN510 controller to operate normally a voltage input of 24 VAC mu...

Страница 26: ...anual output test sequence that may be used to verify output operation and associated output wiring However based on the current step in the test sequence the outdoor air damper may not be open Refer...

Страница 27: ...p failure Enabled Compressor 1 Off Compressor 2 See note below Damper See note below Discharge air temp failure Enabled Compressor s No action Damper No Action Maintenance required example Filter Stat...

Страница 28: ...al operation until another diagnostic occurs If a special diagnostic occurs within 24 hours after an automatic diagnostic reset the diagnostic must be manually reset Cycling Power When the 24 VAC powe...

Страница 29: ...29 Wiring Diagram...

Страница 30: ...30 Wiring Diagram...

Страница 31: ...s 18 to 32 VAC 24 VAC nominal 50 or 60 Hz 300 mA Agency Listings UL and CUL 916 Energy Management System Agency Compliance IEC 1000 4 2 ESD IEC 1000 4 4 EFT IEC 1000 4 5 Surge FCC Part 15 Class A Inpu...

Страница 32: ...ure 40 to 212 F 40 to 100 C J3 4 Analog ground NA Table 19 Binary Outputs Description Terminals Output Rating Load Energized Load De energized Binary Output 1 J1 1 12 VA 1 VAC RMS typical 24 VAC RMS t...

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