Honeywell HH57AC080 Temperature Sensor Instruction Manual
- October 27, 2023
- Honeywell
Table of Contents
Honeywell HH57AC080 Temperature Sensor
Installation Instructions
Part No. CRTEMPSN002A00
The accessory temperature sensor can be used on all rooftop units with a
factory-installed or accessory Economizers IV system.
PACKAGE CONTENTS
| QTY | CONTENTS |
|---|---|
| 1 | Temperature Sensor |
| 2 | 6-20, 3/4 In. Sheet Metal Screw |
| 1 | Grommet |
| 1 | Black Wire |
| 1 | Red Wire |
IMPORTANT: Read these instructions completely before attempting to install the accessory temperature sensor.
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be hazardous due
to system pressure and electrical components. Only trained and qualified
service personnel should install, repair, or service air-conditioning
equipment.
Untrained personnel can perform basic maintenance functions of cleaning coils
and filters and replacing filters. All other operations should be performed by
trained service personnel. When working on air-conditioning equipment, observe
precautions in the literature, tags and labels attached to the unit, and other
safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work gloves. Use quenching
cloth for unbrazing operations. Have fire extinguisher available for all
brazing operations.
It is important to recognize safety information. This is the safety-alert
symbol . When you see this symbol on the unit and in instructions or manuals,
be alert to the potential for personal injury.
Understand the signal words DANGER,WARNING,CAUTION, and NOTE. These words are
used with the safety-alert symbol.
DANGER identifies the most serious hazards which will result in severe
personal injury or death.
WARNING signifies hazards which could result in personal injury or death.
CAUTION is used to identify unsafe practices, which may result in minor
personal injury or product and property damage.
NOTE is used to highlight suggestions which will result in enhanced
installation, reliability, or operation.
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury and/or death.
Disconnect power supply and install lockout tag before attempting to install
the accessory.
GENERAL
Units with factory-installed enthalpy sensor can be changed to outdoor dry bulb changeover control with a single accessory temperature sensor. All other units come with the dry bulb sensor as standard with the factory-installed Economizers IV system. The sensor is used for outdoor temperature control.
Outdoor Dry Bulb Changeover Control
For this control mode, the outdoor temperature is compared to an adjustable set point selected on the sensor. If the outdoor air temperature is above the set point, the Economizers IV system will ad-just the outdoor air dampers to minimum position. If the outdoor air temperature is below the set point, the position of the outdoor air dampers will be controlled to provide free cooling using out-door air.
GENERAL INSTALLATION
This section assumes you are starting with an Economizers IV system installed in the rooftop and equipped with a single enthalpy sensor (P/N HH57AC078). If your Economizers IV system is already equipped with a dry bulb temperature sensor (P/N HH57AC080), STOP. You do not need to continue with this section.
-
Turn off power to the unit and install Lockout Tag.
-
Depending on the type of panels the unit is equipped with:
-
Units with standard panels — Remove the Economizers hood from the base unit and save the screws for Step 8a.
-
Units with factory-installed hinged panels — Open the hinged panel and secure it. Since the panel is hinged, do not remove it from the unit.
-
Disconnect the black and red wires from the pre-existing single enthalpy sensor (P/N HH57AC078) and let them hang. Remove the single enthalpy sensor and save the screws (no. 8) for use in Step 4. The wires will be used later to connect to enthalpy sensor.
-
Use the two sheet metal screws (no. 8) from Step 3 to mount the dry bulb sensor on the front left of the Economizers frame, as shown in Fig. 1 and 2. Use the two screw holes in the Economizers frame.
-
Ensure the black and red wires are connected on the Economizers IV controller correctly. The red wire should be connected to the “SO” terminal and the black wire to the “SO+” terminal. If they are not connected this way, make the connections as described. The CRTEMPSN002A00 kit contains an extra red and black wire. (See Fig. 3.)
-
Pick up the black and red wires left hanging in Step 3 and connect them to the temperature sensor. Connect the red wire to the sensor’s “-” terminal and the black wire to the sensor’s “+” terminal. See Fig. 4 for details.
-
Restore power to the unit and configure the Economizers IV controller per the configuration section of this manual.
-
Depending on the type of panels the unit is equipped with:
-
Units with standard panels — re-install the Economizers hood. Secure the hood using the screws saved from Step 2a.
-
Units with factory-installed hinged panels — Close the hinged panel and latch it.
C7660 Dry Bulb Sensor Set Up
See Fig. 5 and 6.
When outdoor air temperature is below the changeover set point, the sensor
will provide a 20 mA signal to the economizer which translates to OK to
economize positioning the damper open on a call for cooling. When the outdoor
air is above the changeover set point, the sensor provides a 4 mA signal to
the economizer which translates to not OK to economize and the outdoor damper
drives to minimum position. The C7660 temperature sensors replace the control
function of the temperature changeover in the economizer control.
The A-B-C-D potentiometer on the economizer does not control the changeover
point when a C7660 sensor is used in place of an enthalpy sensor. For single
dry bulb set the potentiometer to D. The factory default switch setting is
63°F. The changeover temperature can be field set by changing the positions of
the switches using Fig. 7.
CONFIGURATION
Outdoor Dry Bulb Changeover
For this control mode, the outdoor temperature is compared to an adjustable set point selected on the control. If the outdoor air temperature is above the set point, the Economizers IV system will ad-just the outdoor air dampers to minimum position. If the outdoor air temperature is below the set point, the position of the outdoor air dampers will be controlled to provide free cooling using outdoor air. When in this mode, the LED next to the free cooling set point potentiometer will be on.
Outdoor Air Sensor
The C7660 Dry Bulb sensor has three dip switches that are used to set the
change over temperature to meet the application. The facto-ry default setting
is 63°F. There are two changeover strategies available: exclusive operation
where you can have either mechanical cooling or economizer but not both
simultaneously (Single Stage Thermostat) or integrated operation, where the
economizer and mechanical cooling can operate simultaneously, requires the use
of a two stage thermostat.
Figure 7 lists the changeover switch set point. With the power off, set the
switches to the appropriate temperature required for application. Set the Free
Cooling/Enthalpy Changeover Set Point Potentiometer to “D” located on the face
of the economizer control.
