37
PTEC-M-1A
Control Board
Characteristics and
Diagnostics
Control Board Characteristics
•
Automatic 3-minute Compressor
Lockout
- After the compressor
cycles off, it will not restart for three
minutes. This feature is enabled in
standard or remote thermostat
control. NOTE: This delay may be
defeated by shorting the “FD1”
and “FD2” terminals together for a
minimum of 5 seconds
•
Compressor lock-in feature
-
Whenever the compressor is
switched from off to on because
the room temperature has risen
above or fallen below the specified
limit it will remain on for at least
four minutes. However, if the
thermostat point is changed during
the four minutes this lock in feature
is overridden.
•
Automatic 2nd Stage Electric Heat
(Heat Pump Models)
- If the room
temperature falls to 4°F below the
set point temperature, the reverse
cycle heat pump is shut off and the
strip heat is turned on.
•
Automatic Freeze Protection
-
Whenever power is supplied to the
unit and the master switch is in the
ON position, automatic freeze
protection is active. If the
thermistor senses temperature
below 40°F+/- 5°F, the fan motor
and electric strip heat (or hydronic
heat, if applicable) are switched on.
The heater and fan will remain on
until the thermistor senses a
temperature of 43°F.
•
Fan Advance/ Delay
- The advance
feature will allow the fan to start six
seconds prior to the compressor
starting in either cooling or heating
mode. The delay will keep the fan
running for thirty seconds after the
compressor stops in either cooling
or heating modes.
•
Remote Thermostats
- Always use
an approved thermostat supplied
by the manufacturer. A wall
thermostat that has not been
approved by the manufacturer may
not work correctly with this unit.
•
Remote Functions
- All functions
are controlled by a wall mounted
thermostat.
•
Remote Fan
- When GL terminal is
connected to R terminal the remote
fan speed is switched to low. GH
terminal connected to the R
terminal fan speed is switched to
high.
•
Fuse Protection
- The fuse
protection has been maximized on
the 24 volt circuit so accidental
groundings of the external
terminals will not result in a burned
out board. The unit may be
operated in standard mode if the
fuse is blown. There will be an
auxiliary fuse supplied with the
board. It will be attached to the
main fuse by a plastic clip.
•
Random Delay
- When the master
switch is turned on or power is
reapplied to the control, all
functionality will be locked out for a
random period between two and
four minutes, if Y or W inputs are
active in remote or the mode
switch is set to HI/LO heat or cool.
The delay can be avoided if the
front desk terminals are closed for
more than two seconds, or the
mode switch is in the off or fan
only position.
•
Transformer Selection
- The board
comes with the transformer
selection set for on-board use. If an
external transformer is utilized
move the jumper from “ON-
BOARD to EXTERNAL”. The wiring
for an external transformer then
connects to the “EXT XFRMR”
terminals.
•
Indoor Ambient Thermistor
- The
Indoor Ambient Thermistor senses
actual room temperature.
Summary of Contents for PTEC-070
Page 22: ...PTEC M 1A 22 Refrigeration System PTEC Refrigeration System...
Page 54: ...PTEC M 1A 54 Schematic Diagrams PTEC and PTHC Condensate Pump One Stage Heat...
Page 55: ...55 PTEC M 1A Schematic Diagrams PTEC and PTHC Condensate Pump Two Stage Heat...
Page 56: ...PTEC M 1A 56 Schematic Diagrams PTEC and PTHC Power Vent One Stage Heat...
Page 57: ...57 PTEC M 1A Schematic Diagrams PTEC and PTHC Power Vent Two Stage Heat...
Page 58: ...PTEC M 1A 58 PTEC and PTHC Power Door One Stage Heat Schematic Diagrams...
Page 59: ...59 PTEC M 1A Schematic Diagrams PTEC and PTHC Power Door Two Stage Heat...
Page 60: ...PTEC M 1A 60 Schematic Diagrams PTEC and PTHC Condensate Pump with Power Vent One Stage Heat...
Page 61: ...61 PTEC M 1A Schematic Diagrams PTEC and PTHC Condensate Pump with Power Vent Two Stage Heat...
Page 62: ...PTEC M 1A 62 Schematic Diagrams Hydronic...
Page 63: ......
