Unit Start Up
RT-SVX36K-EN 91
– When the setpoint is exceeded the relay (K1) will be
energized and a blowdown request will close the
Water treatment request binary input on the MCM.
• The second setpoint will be the emergency point
– The second setpoint will open the normally closed
K2 relay which will interrupt the sump proving
circuit which will generate a manual lockout.This
second setpoint will be used to protect the unit from
extremely high conductivity that would indicate a
failure in the system.
• Inside the enclosure for the controller, there will be a
thermostat and strip heater that will protect LCD from
cracking at low ambient conditions.The thermostat
closes at 15°F and opens at 25°F.
Procedure to calibrate conductivity
Note: Visit this webpage for additional documentation:
<http://www.gfsignettools.com/products/pdf/
8860eng.pdf>
• Use a calibrated thermometer and a known
conductivity rating
• There are two different options for having a liquid with
known conductivity
• Purchase a liquid with known conductivity rating
• Purchase a handheld conductivity reader
• Close the ball valve on the chemical treatment tree and
remove the conductivity sensor from the tree
• Enter service test mode on the unit and turn the pump
on, ensuring the compressors are set to Off
• With the conductivity controller connected to the
sensor and power, enter the CALIBRATE menu by
holding down the enter key for 2 seconds
• When asked for the calibration key code, hit the UP-UP-
UP-DOWN arrow keys in sequence
• Using the UP and DOWN arrows go to Chan 1 Cell:
Standard. Ensure this channel is set to standard
• If not press the RIGHT arrow key and set to standard
then press the ENTER key to return to the
CALIBRATION menu
• Using the UP and DOWN arrows go to Chan 1 Cell.
Ensure that the cell constant is set to 1.0
• If not press the RIGHT arrow key and set the cell
constant to 1.0 then press the ENTER key to return to
the CALIBRATION menu
• Using the UP and DOWN arrows go to Chan 1 Set:
Temperature and press the RIGHT arrow key to enter
the edit mode
• Adjust the temperature on the controller to match the
actual temperature
• Press the ENTER key to save the input and return to the
CALIBRATE menu
• Using the UP and DOWN arrows, go to the Chan 1 Set:
Conductivity and press the RIGHT arrow key to enter
the edit mode
• Adjust the conductivity on the controller to match the
actual conductivity rating of the liquid
• Press the ENTER key to save the conductivity rating
and return to the CALIBRATE menu
• When finished calibrating the controller, press the UP
and DOWN key simultaneously to return to normal
operating mode
Procedure to set purge setpoints on the
conductivity controller
Note: Visit this webpage for additional documentation:
<http://www.gfsignettools.com/products/pdf/
8860eng.pdf>
• Work with local water treatment expert to identify
nominal purge and emergency purge conductivity
value.
• Close the ball valve on the chemical treatment tree and
remove the conductivity sensor from the tree.
• Enter Service test mode on the unit HI and energize the
sump pump, ensuring the compressors are set to
“OFF”
• With the conductivity controller connected to the
sensor and power, enter the CALIBRATE menu by
holding down the enter key for 2 seconds
• When asked for the calibration key code, hit the UP-UP-
UP-DOWN arrow keys in sequence
• Using the UP and DOWN arrows, go to Relay 1
Setpoint: and press the RIGHT arrow key to enter edit
mode (K1)
• Adjust the set point to the nominal blowdown
conductivity value
• Press the ENTER key to return to the CALIBRATE menu
• Using the UP and DOWN arrows, go to Relay 2
Setpoint: and press the RIGHT arrow key to enter edit
mode (K2)
• Adjust the set point to the emergency conductivity
value
• Press the ENTER key to return to the CALIBRATE menu
• When finished setting the values, press the UP and
DOWN key simultaneously to return to normal
operating mode
Gas Heating Sequence of Operation
Standard Two Stage Gas Furnace
The control system for the rooftop units are wired to
ensure that the heating and cooling do not occur
simultaneously. Refer to the wiring diagram that shipped
with the unit while reviewing the following sequence of
operation.
Honeywell Ignition System
When a heating requirement exists, the Rooftop Module
(RTM) starts the supply fan and sends a request for heat to
the Heat Module.The Heat Module closes K1 contacts and
starts the combustion blower motor (4B11).The
combustion blower motor starts on low speed through the
normally closed combustion blower relay (4K33) contacts.
The supply airflow switch (4S38) and the combustion air
switch (4S25) closes. Power is applied through the high
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