Bypass Controller Inputs And Outputs; Install Duct Temperature Sensor; Install Pressure Tubing; Dmp_Pos - Carrier VVT 33ZC Installation, Start-Up And Configuration Instructions

Bypass Controller Inputs and Outputs —
pass controller inputs and outputs are shown in Tables 1
and 2.
Table 1 — Bypass Controller Inputs
CHANNEL J4 TERMINATIONS
DUCT_TMP 10, 12

DMP_POS

9 (10 v), 7 (W+), 5 (–)
SP_SENSR 3, 1
Table 2 — Bypass Controller Outputs
CHANNEL J5 TERMINATIONS
DMPR_CCW 1 (24 VAC), 2
DMPR_CW 3 (24 VAC), 2
Install Duct Temperature Sensor —
perature sensor is required. The duct temperature sensor must
be installed in the supply air duct. The 33ZCSENDAT is the
recommended sensor. See Fig. 5 for sensor details.
For bypass systems, the duct temperature sensor should be
moved to a location which will provide the best sensing of the
supply-air temperature during heating and cooling.
For bypass systems using a ducted supply, the duct tempera-
ture sensor should be located in the main supply duct
downstream of the discharge of the air source and before the
bypass damper to allow good mixing of the supply airstream.
The 33ZCSENDAT duct sensor is a small epoxy sensor that
1
is 1 / -in. long. A grommet is provided for filling the hole
4
around the sensor cable after the sensor is located in the duct.
See Fig. 3 and 6 for mounting location.
Disconnect electrical power before wiring the bypass con-
troller. Electrical shock, personal injury, or damage to the
fan coil controller can result.
Do not run sensor or relay wires in the same conduit or race-
way with Class 1 AC service wiring. Do not abrade, cut, or
nick the outer jacket of the cable. Do not pull or draw cable
with a force that may harm the physical or electrical properties.
Avoid splices in any control wiring.
.225/ .245
(5.72/6.22)
0.06
(1.5)
NOTE: Dimensions are in inches.
Dimensions in ( ) are in mm.
The by-
CONTROL
DESCRIPTION
DEVICE
Duct Temperature 10K Thermistor
Damper Position 0-10 VDC
System Pressure 0-5 VDC
CONTROL
DESCRIPTION
DEVICE
Damper CCW 24 VAC
Damper CW 24 VAC
The duct tem-
Fig. 5 — 33ZCSENDAT Duct Sensor
Perform the following steps to connect the duct temperature
sensor to the bypass controller:
1. Drill or punch a
Fig. 6. Duct sensor can be installed to hang from top of
duct or from the sides. Sensor probe can touch side of
duct.
2. Push sensor through hole in the supply duct. Snap the
grommet into the hole until it is secure. Pull on the leads
of the duct sensor until the sensor is snug against the
grommet.
3. Connect the sensor leads to the bypass controller's termi-
nal board at the terminals labeled DAT (J4-10) and GND
(J4-12). See Fig. 4 for wiring. If extending cable length
beyond 8 ft, use plenum rated, 20 AWG (American Wire
Gage), twisted pair wire. Sensor wiring does not have
polarity. Either lead can be wired to either terminal.
4. Neatly bundle and secure excess wire.
5. Using electrical tape, insulate any exposed lead to prevent
shorting.
6. Connect shield to earth ground (if shielded wire is used).
Install Pressure Tubing —
should be located in the main supply duct before the first
branching of ductwork. Run the tubing from the bypass con-
troller to the installation location. For stable airflow measure-
ment, the recommended minimum length of tubing is 2 ft.
Connect the tubing to the high side of the pressure sensor
marked P1. Make sure the low side of the pressure sensor (P2)
is open to the atmosphere. See Fig. 3.
DRILL 1/4" HOLE
IN TOP OF DUCT
AND LET SENSOR
HANG DOWN
ALTERNATE INSTALLATION
LOCATION INSIDE OF DUCT
Fig. 6 — DAT Installation Location
1.00
(25.4)
1.25
(31.8)
5
1 / -in. hole in the supply duct. See
4
The static pressure pick up
SUPPLY DUCT
75.0 .5
(1905)