Return Air Enthalpy Sensor i
Mount the return-air enthalpy sensor (33CSENTSEN) in
the return-air section of the economizer. The return air
sensor is wired to the enthalpy controller
(33CSENTHSW). See Fig. 72.
__ -4-20 @-[-RED
Main _r_ BL K
+ ;uDtC t_-'X_ GRA._F_ CTBECO_
x2222/ I -- L_I (P'LINK: to J4-2) or
Outside Airwitc h (RTU Open: to J2-6)
s
I Lit- + 24-36 Return Air
I I VDC In Enthalpy
- 4-20 Main Sensor
I out
Cl1161
Fig. 72 - Outside and Return Air Enthalpy Sensor
Wiring
Smoke Detectors
Smoke detectors are available as factory-installed options on
50TC models. Smoke detectors may be specified for Supply
Air only or for Return Air without or with economizer or in
combination of Supply Air and Return Air. All components
necessary for operation are factory-provided and mounted.
The unit is factory-configured for immediate smoke detector
shutdown operation; additional wiring or modifications to
unit terminal board may be necessary to complete the unit
and smoke detector configuration to meet project
requirements.
Units equipped with factory-optional Return Air smoke
detectors require a relocation of the sensor module at unit
installation. See Fig. 73 for the as shipped location.
Return Air
Smoke Detector
(as shipped)
.
C12282
Fig. 73 - Return Air Smoke Detector, Shipping Position
Completing Installation of Return Air Smoke Sensor:
1. Unscrew the two screws holding the Return Air
Smoke Detector assembly. See Fig. 74, Step 1. Save
the screws.
2. Turn the assembly 90 and then rotate end to end.
Make sure that the elbow fitting is pointing down. See
Fig. 74, Step 2.
3. Screw the sensor and detector plate into its operating
position using screws from Step 1. See Fig. 74, Step 3.
4. Connect the flexible tube on the sampling inlet to the
sampling tube on the basepan.
Additional Application Data i
Refer to Catalog No. HKRNKA-1XA for discussions on
additional control features of these smoke detectors
including multiple unit coordination.
€_--o
Step 1 Step 2
c
o
Step 3
C12283
Fig. 74 - Completing Installation of Return Air Smoke Sensor
41
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