User's Manual

1068152-YTG-L-0815
Johnson Controls Unitary Products 177
23 09 13 Instrumentation and Control Devices for HVAC
23 09 13.23 Sensors and Transmitters
23 09 13.23.A. Thermostats
1. Thermostat must
a. energize “G” when calling for fan only or continuous fan.
b. have capability to energize 2 different stages of cooling, and 2 different stages of heating.
c. include capability for occupancy scheduling.
23 09 23 Direct- digital Control system for HVAC
23 09 23.13 Decentralized, Rooftop Units:
23 09 23.13.A. Simplicity SE (Unit based microprocessor control)
1. Shall be ASHRAE 62- 2001 compliant.
2. Shall include an integrated economizer controller to support an economizer with 2 to 10 v DC actuator input.
3. Controller shall accept the following inputs: space temperature, setpoint adjustment, outdoor air temperature,
indoor air quality, outdoor air quality, indoor relative humidity, compressor lockout, fire shutdown, enthalpy,
fan status, remote time clock/door switch.
4. Shall accept a CO
2
sensor in the conditioned space, and be Demand Control Ventilation ready.
5. Unit shall provide surge protection for the controller through a circuit breaker.
6. Shall have an LED display independently showing the status of activity on the communication bus, and
processor operation.
7. Software upgrades will be accomplished by local download. Software upgrades through chip replacements
are not allowed.
A. Unit shall be complete with self-contained low-voltage control circuit protected by a resettable circuit breaker
on the 24-volt transformer side.
B. Unit shall incorporate a lockout circuit which provides reset capability at the space thermostat or base unit
should any of the following standard safety devices trip and shut off compressor:
C. Loss-of-charge/Low-pressure switch.
D. High-pressure switch.
E. Freeze-protection temperature sensor, evaporator coil. If any of the above safety devices trip, an LED (light-
emitting diode) indicator shall flash a diagnostic code that indicates which safety switch has tripped.
F. Unit shall incorporate “AUTO RESET” compressor over temperature, over current protection.
G. Unit shall operate with conventional thermostat designs and have a low voltage terminal strip for easy hook-up.
H. Unit control board shall have on-board diagnostics and fault code display.
I. Standard controls shall include anti-short cycle and low voltage protection, and permit cooling operation down
to 0 ºF.
J. Control board shall monitor each refrigerant safety switch independently.
K. Control board shall retain last 5 fault codes in non-volatile memory, which will not be lost in the event of a
power loss.
23 09 23.13.B. RTU Open - multi- protocol, direct digital controller:
1. Shall be ASHRAE 62- 2001 compliant.
2. Shall include built- in protocol for BACNET , Modbus , and Johnson N2.
3. Shall allow access of up to 62 network variables (SNVT). Shall be compatible with all open controllers
4. Baud rate Controller shall be selectable using a dip switch.
48HC