York Y33 User Manual download pdf (Page 93)

246653-YTG-E-0108

Johnson Controls Unitary Products 93

The control shall lock on the Fan if the high temperature limit

trips three times in one hour of operation.

The control will have a software programmable Fan Mode

Switch for Auto operation or Continuous operation.

When the Fan is in the Continuous mode, it will run continu-

ously during the occupied schedule and in the Auto mode

when in an unoccupied schedule.

The control shall be capable of operating the fan without a G

or fan signal from the thermostat.

EQUIPMENT CONTROL FEATURES

The control shall be capable of communicating on the Stan-

dard Open protocol, Modbus

RTU.

The register data for the Modbus

must be publicly available

and open.

Monitoring Software shall be provided at no cost. The moni-

toring software shall have a flashing icon when any unit wired

to the computer has an alarm. Clicking the flashing icon shall

display the fault code and the details of the fault.

The networking setup shall be completed by connecting a

three-wire daisy chain cable to each unit, then powering all

the units up and pushing a button on each control. There

shall not be any dipswitches to configure the network

address.

The control shall use a communication driver that is capable

of having 64 nodes on the bus before a repeater is needed.

The control shall use non-volatile memory to store the last

five alarms. There shall be a single button to push to recall

these last five alarms. The alarms shall be stored first in last

out. The first flash code shall be the last alarm that occurred.

There shall be a button press sequence to clear the alarms in

non-volatile memory.

The control shall have a button to reset compressor lockouts

without powering the unit down.

The control shall have a button to clear compressor Anti-

Short Cycle Delays. When this button is pressed it will only

clear the Anti-Short Cycle Delays for one cycle only and not

permanently.

The control will be compatible with any BAS (Building Auto-

mation System). Any BAS shall be able to control the equip-

ment when wired to the control's Thermostat Terminal Strip.

The control shall have loading of at least 25 milliamps on all

thermostat inputs for controllers and thermostats that use out-

put TRIACs.

The control shall have a Smoke Detector Shutdown input on

the board. The control shall be powered through this input,

so when the Smoke Detector trips, the control will shut down

the unit immediately.

The control will have low voltage protection for the contactors

and will not energize a contactor if the voltage is below 19.2

VAC, to insure contactor pull-in. If the control has a compres-

sor contactor energized when the voltage drops, it shall not

de-energize the contactor until the voltage drops below 16

VAC, which is the drop out voltage for most contactors.

The control shall have a means of low ambient control with-

out adding any additional components. The control shall

have a means of cycling the compressor on for 10 minutes

and off for 5 minutes to defrost the indoor coil when the out

side ambient is below a low ambient switch point without add-

ing additional components.

The control shall have a means of storing compressor run

time. This data shall be available through communication.

The control shall have the ability to clear this data when a

compressor is replaced.

The control shall have the ability to store a name of at least

26 characters in length. The control will leave the factory with

the serial number of the equipment it is in, stored in non-vola-

tile memory in the Name location.

The control shall have the ability to store the model number

of the equipment of at least 26 characters in length. The con-

trol will leave the factory with the model number of the equip-

ment it is in, stored in non-volatile memory.

The control shall have the ability to store the serial number of

the equipment of at least 26 characters in length. The control

will leave the factory with the serial number of the equipment

it is in, stored in non-volatile memory.

The control shall not power the contactors through the ther-

mostat wiring. Dropping voltage over the thermostat wiring

causes chattering contactors when the contactors are pow-

ered in this manner.

The control will operate and monitor up to 3 stages of heat

independently.

The control shall monitor the Gas Heat operation in the heat-

ing mode. It shall monitor the gas valve when there is a call

for heating. The control shall alarm when there is a call for

heat and no gas valve voltage after 5 minutes.

There will only be one control board for this series of units, for

both CV and VAV operation.

COMFORT CONTROL FEATURES

The control will be installed and tested at the factory where

the equipment is assembled.

The control will use a Wall Senor that has a means of overrid-

ing the unoccupied mode for a programmable amount of

time.

The Unoccupied Override time will be programmed in min-

utes up to 4 hours.

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York Y33 User Manual Page 93

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