York Millennium YCAJ150, Installation Operation & Maintenance, Page: 109 / 116

FORM 150.65-NM4
109 YORK INTERNATIONAL
REMOTE RESET OPTION
The Remote Reset Option allows resetting of the water
temperature setpoint using a 0 - 10VDC input, a 4 - 20mA
input, or a dry contact. The electronic circuitry in the
option converts the signals mentioned above into pulse
width modulated (PWM) signals which the microproces-
sor can understand. Whenever an offset is called for, the
change may be noted by the user by pressing the RE-
MOTE RESET TEMP/RANGE Key on the Keypad. All
refresh requirements normally associated with PWM in-
puts will be automatically taken care of by the electron-
ics in the option.
It is important to note that the maximum offset, when
this option is installed, is 20°F (11.1°C). This is due to
the electronic’s limitation of maximum 11 sec. pulse. If
an offset greater than 20°F (11.1°C) is required, a user
supplied PWM signal of up to 21 sec. is needed and the
Remote Reset Option cannot be installed.
The Remote Reset Option P/N 471-01232-181 consists
of a Remote Reset printed circuit board, a mounting
bracket and associated wiring. Each of the 3 signal types
will require individual jumpering of the printed circuit board.
This will be discussed in the following text.
0 - 10VDC
Jumpers JU2 and JU4 must be IN. All other jumpers
should be OUT. Program the REMOTE TEMP SETPOINT
RANGE (page 77) for 40°F (4.4°C) which will allow a
20°F (11.1°C) offset with an input of 10VDC. The tem-
perature will be offset linearly according to the voltage (0
- 10VDC) applied.
The 0 - 10VDC signal should be connected to the + and
- terminals on the TB3 Terminal Block at the right of the
Microprocessor Board. Be sure polarity is correct.
CAUTION: THE 0 - 10VDC INPUT SIGNAL WIRING
MUST NOT BE EARTH GROUNDED!
4 - 20mA
Jumpers JU3 and JU5 must be IN. All other jumpers
should be OUT. Program the REMOTE TEMP SETPOINT
RANGE (page 77) for 40°F (4.4°C) which will allow a
20°F (11.1°C) offset with an input of 20mA. There will be
no offset with an input of 4mA. The temperature will be
offset linearly according to the current (4 - 20mA) ap-
plied.
The 4 - 20mA input signal should be connected to the +
and - terminals on the TB3 Terminal Block at the right
of the Microprocessor Board. Be sure polarity is correct.
CAUTION: THE 4 - 20mA INPUT SIGNAL WIRING
MUST NOT BE EARTH GROUNDED!
Dry Contact
A dry contact may also be used to offset temperature.
This allows a single offset whenever the contact is closed.
The offset is determined by the adjustment of the R11
potentiometer on the Remote Reset Board. Adjust the
potentiometer as needed to obtain the desired offset.
Jumper JU1 must be IN. All other jumpers must be OUT.
Program the REMOTE RESET TEMP SETPOINT
RANGE (page 77) for 40°F (4.4°C) which will allow the
R11 pot to be adjusted for an offset of as much as 20°F
(11.1°C) when the contact is closed.
The dry contact should be connected directly to the P1-
1 (J1-1) and P1-2 (J1-2) terminals on the Remote Reset
Board (Fig. 41, page 110).
NOTE: The coil of the controls used for reset must be
suppressed. Use YORK P/N 031-00808-000 sup-
pressor.
The Remote Setpoint Reset will not operate
when a Remote Control Center Option is con-
nected to the Micropanel. The Remote Con-
trol Center will always determine the setpoint.