Specifications

IM 934-5 Page 23 of 48
Controls
Standard (Non-programmable) Digital
Touchpad Control
Figure 30: Standard Digital Touchpad ControlApplication
The PTAC Digital Control is used to control a PTAC Unit
that includes both an integral air conditioner and a source of
heat.
The Digital Control is operated with a Touchpad.
Inputs and Outputs
• Indoor coil sensor, (ICS)
• Outdoor coil sensor, (OCS)
• Indoor air sensor, (IAS)
• Outdoor air sensor, (OAS)
• Remote T’stat, T’STAT (RCWYBG)
• Heat Fan Lock Out (HFLO)
• Power supply, (24VAC)
• Line voltage input, (L1, L2)
• Indoor fan standby voltage, (L1STB L2STB)
• Control selection, (LUI, T’STAT
• Model selection, (AC/E, HP, HP/E)
• Time delay bypass, (TEST)
• Indoor off fan cycle, (FAN, OFF CYCLE–10, 20,
30, 1 HR)
Outputs
• Compressor output, COM
• Indoor fan, BLOWER LO, HI
• Outdoor fan, OUTDOOR FAN
• Electric heater, ELE
• Reversing valve, REV VALVE
Figure 31: Standard Digital Control Indicators
9- LED
Indicators
LED
2-Digit Display
7- Push Buttons
User Interface
The user will by default control the Electronic Controller via
the touchpad. The user can select with a jumper for the unit
to receive commands from a Remote Thermostat.
Table 1: Keys and Indicators Labels
ON/OFF, FAN SPEED, MODE
7 Push Buttons FAN MODE, SLEEP
Temp buttons: for
Temp UP and for Temp DOWN
9 LED Indicators SLEEP, COOL, COOL/DRY, FAN,
HEAT, HIGH, LOW, CYCLE, CONT.
LED 2 Digit Displays No Label
Display Function Legend
Tr = Room Temperature
hI = High Room Temperature
Lo = Low Room Temperature
LA = Low Ambient Lockout
= Secondary (Slave) Unit Touchpad Display - Indicates
Unit is Controlled by a Master. Occurs when Slave
“Control Select” Jumper is on SEC Pins
rT = Remote Thermostat Control
tP = Touchpad Control
t = Time
Ts = Temperature Setpoint
Rf = Room Freeze Condition
CF = Coil Freeze Protection
F = Fahrenheit
C = Celsius
LC = Control Lockout Mode
Remote Thermostat Control
The Remote Thermostat can be any thermostat that can
interface with an electronic thermostat via RCWYBG
terminals. The Control Selection jumper must be in T’STAT
position. During a call the remote thermostat will pass R
back to the controller on a respective terminal. The push but-
tons on the touchpad become inactive in the remote thermo-
stat mode, EXCEPT in T'STAT mode, the fan speed can be
changed at the Touchpad and the fan mode is dictated by the
Remote t'stat. However, the control pad LED display will
indicate the mode of operation, and the room temperature.
Note: Intermsofoutputs,therearetwotypesof
thermostats:relaycontactsandsolidstate.Ifyou
openthethermostatanddon’tseerelaysthenitmust
besolidstate.
 Manufacturersofsolidstateoutputthermostats
includeloadingresistorsontheirinstallationkits.
Theyareof560Ohmand3Wvalue.Theseresistors
aremeanttoloadthermostatsolidstateoutputs
inorderfortheoutputvoltagetobeeither0or
24VAC,i.e.nooatingvoltage.Theseresistorsare
connectedfromW,Y,Gtocommon(C),respectively.
You can wire any type of 24Vac thermostat straight into
the REMOTE T’STAT connector of PTAC control boards,
667997102, 667997203 and 667997303 (Basic, Premium
and Auto-Changeover models) and the control boards will
recognize the signals from them.