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Modulating Baseboard Hydronic Heating —

In-

stall the water valve on the leaving water end of the baseboard
heater. See Fig. 30. Observe the fluid flow direction when
mounting the valve. Be sure to properly heat sink the valve and
direct the flame away from the actuator and valve body when
sweating the valve connections. Install the leaving water tem-
perature sensor (33ZCSENCHG) on the hydronic heating coil
as shown. The sensor accommodates nominal copper pipe
from

to 1-in. (OD sizes from

to 1.125 in.). It should be

secured to the pipe with the clamp supplied. If piping is larger
than 1-in. nominal size, a field-supplied clamp must be used.
Use fiberglass pipe insulation to insulate the sensor assembly.

Refer to Fig. 7 and 11 to wire the modulating water valve

and the sensor to the zone controller. Connect the leaving water
temperature sensor to the controller using the wiring connec-
tions shown for the SAT sensor. (NOTE: The leaving water
temperature sensor replaces the SAT sensor in this application.)
Use 18 or 20 AWG wire for all connections. The water valve
actuator housing may be used as a junction box if the leaving
water temperature sensor cable is not long enough and the
sensor cable must be extended to reach the controller.

For modulating hydronic heating applications, the default

configuration must be changed to properly control the valve.
Refer to the service configuration table and set the Heating
Loop parameters as follows:
Proportional Gain = 20.0
Integral Gain = 0.5
Derivative Gain = 0.0
Start Value = 102.0

Also, set the Ducted Heat decision to YES and set the

Maximum Duct Temperature decision equal to the design
(maximum) boiler water temperature minus 20 degrees, but not
greater than 200 F.

Connect the Carrier Communicating Net-
work Communication Bus —

The zone controllers

connect to the bus in a daisy chain arrangement. The zone
controller may be installed on a primary bus or on a secondary
bus from the primary bus. Connecting to a secondary bus is
recommended.

At 9,600 baud, the number of controllers is limited to

128 zones maximum, with a limit of 8 systems (Linkage Coor-
dinator configured for at least 2 zones). Bus length may not

exceed 4000 ft, with no more than 60 devices on any 1000-ft
section. Optically isolated RS-485 repeaters are required every
1000 ft.

At 19,200 and 38,400 baud, the number of controllers

is limited to 128 maximum, with no limit on the number of
Linkage Coordinators. Bus length may not exceed 1000 ft.

On larger systems with more than 8 linkage coordinators,

use bridges to split the system into sections. The first zone con-
troller in a network connects directly to the bridge and the
others are wired sequentially in a daisy chain fashion. Refer to
Fig. 31 for an illustration of Communication Bus wiring.

The Communication Bus also connects to the zone control-

ler space temperature sensor. Refer to the Install the Sensors
section for sensor wiring instructions.
COMMUNICATION BUS WIRE SPECIFICATIONS — The
Communication Bus wiring is field-supplied and field-
installed. It consists of shielded three-conductor cable with
drain (ground) wire. The cable selected must be identical to the
Communication Bus wire used for the entire network. See
Table 2 for recommended cable.

Table 2 — Recommended Cables

NOTE: Conductors and drain wire must be at least 20 AWG
(American Wire Gage), stranded, and tinned copper. Individual con-
ductors must be insulated with PVC, PVC/nylon, vinyl, Teflon, or
polyethylene. An aluminum/polyester 100% foil shield and an outer
jacket of PVC, PVC/nylon, chrome vinyl, or Teflon with a minimum
operating temperature range of –20

C to 60

C is required.

CONNECTION TO THE COMMUNICATION BUS

1. Strip the ends of the red, white, and black conductors of

the communication bus cable.

2. Connect one end of the communication bus cable to the

bridge communication port labeled COMM2 (if connect-
ing on a secondary bus).
When connecting the communication bus cable, a color
code system for the entire network is recommended to
simplify installation and checkout. See Table 3 for the
recommended color code.

3. Connect the other end of the communication bus cable

to the terminal block labeled J2A in the zone controller
of the first air terminal. Following the color code in
Table 3, connect the Red (+) wire to Terminal 1.
Connect the White (ground) wire to Terminal 2.
Connect the Black (–) wire to Terminal 3.

4. Connect additional zone controllers in a daisy chain fash-

ion, following the color coded wiring scheme in Table 3.
Refer to Fig. 31.

NOTE: The communication bus drain wires (shield) must be
tied together at each zone controller. If the communication bus
is entirely within one building, the resulting continuous shield
must be connected to ground at only one single point. If the
communication bus cable exits from one building and enters
another building, connect the shields to ground at a lightning
suppressor in each building where the cable enters or exits (one
point only).

Table 3 — Color Code Recommendations

MANUFACTURER

CABLE PART NO.

Alpha

2413 or 5463

American

A22503

Belden

8772

Columbia

02525

SIGNAL TYPE