Carrier AQUAZONE 50PTH User Manual download pdf (Page 37)

The WSHP Open multi-protocol controller will control me-

chanical cooling, heating, hot gas reheat and waterside

economizer outputs based on its own space temperature

input and set points. An optional CO

IAQ (indoor air qual-

ity) sensor mounted in the space can maximize the occu-

pant comfort. The WSHP Open has its own hardware

clock that is automatically set when the heat pump soft-

ware is downloaded to the board. Occupancy types are de-

scribed in the scheduling section below. The following sec-

tions describe the functionality of the WSHP Open multi-

protocol controller. All point objects that are referred to in

this sequence of operation will be referenced to the objects

as viewed in the BACview

handheld user interface.

Scheduling

Scheduling is used to start/stop the unit based upon a time

period to control the space temperature to specified occu-

pied heating and cooing set points. The controller is de-

faulted to control by occupied set points all the time, until

either a Time Schedule is configured with the Equipment

Touch™ interface, i-Vu

Open, or a third party control sys-

tem Enables/Disables the BAS On/Off point. Your local

time and date must be set for these functions to operate

properly. The occupancy source can be changed to one of

the following:

Occupancy schedules — The controller will be occu-

pied 24/7 until a Time schedule is configured using either,

i-Vu Open, Equipment Touch or a third party Enables/Dis-

ables the BAS On/Off point. This can be disabled by going

to Config>Unit>Occupancy Schedules and changing the

point from Enable to Disable.

NOTE: This point must be Enabled in order for i-Vu Open

or Bacview

to assign a Time schedule to the controller.

Schedule_Schedule — The unit will operate according

to the schedule configured and stored in the unit. The

schedule is accessible via the Equipment Touch user inter-

face, i-Vu Open, or Field Assistant. The daily schedule con-

sists of a start/stop time (standard or 24 hour mode) and

seven days of the week, starting with Monday and ending

on Sunday.

Occupancy input contact (option) — If configured for

remote occupancy control (default), the WSHP Open con-

troller has the capability to use an external dry contact clo-

sure to determine the occupancy status of the unit. You will

need to disable the Occupancy Schedules in order to utilize

the Occupancy Contact Input. The control will cause the

unit to go into an occupied mode whenever the abnormal

input is sensed. After the input returns to its normal state,

the unit will stay in the occupied mode for the configured

Occupancy Override Delay period (15 minutes default).

NOTE: Scheduling can only be controlled from one

source.

BAS (building automation system) on/off — For use

with a Building Automation System that supports network

scheduling, you will need to disable the Occupancy Sched-

ules so the BAS system can control the unit through a net-

work communication and the BAS scheduling function.

NOTE: Scheduling can only be controlled from one

source.

Global occupancy scheduling — The WSHP Open

controller has the capability to read the occupancy status

from another unit so that a group of WSHPs can be con-

trolled from a single occupancy schedule. The local Occu-

pancy Schedules must be disabled in order to utilize the

global occupancy input.

NOTE: Scheduling can only be controlled from one

source.

BACnet network occupancy input — The WSHP Open

controller has the capability to accept an external BACnet

Binary Network Input for occupancy control. This function

is only compatible with units used in BACnet systems. You

will need to configure the “System Occupancy” BACnet

network input point to locate the device and point name

where the external occupancy point information resides.

Also Occupancy Schedules must be disabled in order to

utilize this input.

NOTE: Scheduling can only be controlled from one

source.

Fire/smoke detector (FSD) input (field optional)

The WSHP Open controller has the capability to read the

status of a normally closed FSD contact input to determine

if a fire or smoke detector alarm is present. If the controller

determines an alarm condition is present, all heating, cool-

ing and the fan are disabled. The normal state of the switch

is factory set to Normally Closed and cannot be changed.

Shutdown input

The WSHP Open controller has a shutdown input (soft-

ware) which when set to its Active mode will cause the

WSHP to safely shut down in a controlled fashion. Heating

and cooling will be disabled after any minimum runtime

conditions expire and the fan will be disabled after the fan

off timer expires. All alarms are reset but any active alarm

will remain active. After the shutdown input transitions

from Active mode to Inactive mode, the WSHP Open con-

troller will restart after the configured power fail restart de-

lay expires.

Indoor fan

The indoor fan will operate in any one of three modes de-

pending upon the user configuration selected. Fan mode

can be defined/selected as Auto, Continuous, or Always

On. In Auto mode the fan is in intermittent operation dur-

ing both occupied and unoccupied periods. Continuous fan

is intermittent during unoccupied periods and continuous

during occupied periods. Always On operates the fan con-

tinuously during both occupied and unoccupied periods. In

the default mode, Continuous, the fan will be turned on

whenever any one of the following is true:

• It is in occupied mode. Determined by its occupancy

status.

• Whenever there is a demand for cooling or heating in

the unoccupied mode.

• When there is a call for dehumidification (optional).

When power is reapplied after a power outage, there

will be a configured time delay of 5 to 600 seconds before

starting the fan. There are also configured fan delays for

Fan On and Fan Off. The fan on delay defines the delay

time (0 to 30 seconds; default 10) before the fan begins to

Controls — WSHP Open sequence of operation

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Carrier AQUAZONE 50PTH User Manual Page 37

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