Catalogue

52 WSHP-PRC020D-EN
Controls
In a high pressure situation, the compressor contactor is de-energized, which suspends
compressor operation.The control will go into soft lockout mode initializing a three minute time
delay and a random start of 3 to 10 second time delays. Once these delays have expired, the unit
will be allowed to run. If a high pressure situation occurs within one hour of the first situation, the
control will be placed into a manual lockout mode, halting compressor operation, and initiating the
general alarm.
In a low temperature situation, the low pressure switch will transition open after the compressor
starts. If the switch is open for 45 seconds during compressor start, the unit will go into soft lockout
mode initializing a three minute time delay and a random start of 3 to 10 second time delays. Once
these delays have expired, the unit will be allowed to run. If the low pressure situation occurs again
within 30 minutes, and the device is open for more than 45 seconds, the control will be placed into
a manual lockout mode, halting compressor operation, and initiating the general alarm.
In a condensate overflow situation, the control will go into manual lockout mode, halting
compressor operation, and initiating the general alarm.
The general alarm is initiated when the control goes into a manual lockout mode for either high
pressure, low pressure or condensate overflow conditions.The alarm can be reset at the
thermostat or by cycling power to the unit.
Small Building Control
The deluxe 24V electro-mechanical design may be applied as a stand-alone control system or as
a multi-unit installation system.With a stand-alone design, units run independently of one another
with an electronic digital thermostat.
With a multiple unit installation, the units may be daisy-chained directly to theTrane Tracer loop
controller (TLC), pump(s), boiler, and tower for a complete net worked water-source system.
Tracer ZN510 Controls
TheTracer ZN510 direct digital control (DDC) system is specifically designed for single water-
source equipment to provide control of the entire unit, as well as outputs for unit status and fault
detection.This device is factory installed, commissioned, and tested to ensure the highest level of
quality in unit design.
Each of the controller's features and options were selected to coordinate with the unit hardware
to provide greater energy efficiency and equipment safety to prolong the equipment life.
Because the ZN510 is LonTalk certified, it is capable of working with, and talking to other LonTalk
certified controllers providing the building owner more choices, and the design engineers more
flexibility to meet the challenges of building automation. Features include 75 VA transformer,
compressor contactor, compressor lockout relay, compressor run capacitor, random start delay,
heating/cooling status, occupied/unoccupied mode, low pressure switch, high pressure switch, fan
Direct Digital Controls
When the ZN510 controller is linked directly to theTracer
Summit, eachTracer Summit building automation
system can connect a maximum of 120Tracer ZN510
controllers.