Enthalpy Switch/Receiver And Enthalpy Sensor - Carrier SPS Installation Manual

Enthalpy switch/receiver and Enthalpy sensor

Enthalpy switch/receiver - Part #33CSENTHSW
Enthalpy sensor - Part #33CSENTSEN
Outdoor enthalpy control
Requires a field-installed enthalpy switch/receiver. The enthalpy switch/receiver, mounted in the outdoor air
intake, senses temperature and humidity of the surrounding air and calculates the enthalpy.
The enthalpy switch/receiver:
• Energizes the relay output when the outdoor enthalpy is above 28 BTU/lb OR dry bulb temperature is
above 75° F
•
De-energizes the relay output when the outdoor enthalpy is below 27 BTU/lb AND dry bulb temperature
is below 74.5° F.
The relay output is wired to the unit economizer which opens or closes based on the output of the switch.
Differential enthalpy control
Requires an enthalpy switch/receiver and an enthalpy sensor. The enthalpy switch/receiver, mounted in the
outdoor air intake, calculates outdoor air enthalpy. The enthalpy sensor, mounted in the return airstream,
calculates the indoor air enthalpy.
The enthalpy switch/receiver energizes:
•
The HI Enthalpy relay output when the outdoor enthalpy is greater than the indoor enthalpy
•
The LOW Enthalpy terminal when the outdoor enthalpy is lower than the indoor enthalpy
The relay output is wired to the unit economizer which opens or closes based on the output of the switch.
NOTE The enthalpy is calculated using an average altitude of 1000 ft above sea level.
Enthalpy switch/receiver
HI LOW GND 24
Enthalpy
Carrier Sensors
4.25 in.
(10.8 cm)
33CSENTHSW
RETURN AIR
ENTH SENSO R
- +
4-20 24-36
mA In VDC
VAC
out
Model #: HH57ZC003
Power: 24 VAC
Output: 10 A Form 1C Relay w/
24 VAC Sourced Power
3.75 in.
(9.5 cm)
Enthalpy sensor
3.35 in.
(8.5 cm)
Enthalpy switch/receiver and Enthalpy sensor
4.25 in.
(10.8 cm)
33CSENTSEN
+ -
4-20 24-36
mA In VDC
out
Model #: HH57ZC001
Power: 24 to 36 VDC
Span: 0 to 50 BTU/lb
Output: 4 to 20 mA
3.75 in.
(9.5 cm)
3.35 in.
(8.5 cm)
49