Copyright © D 369 -10/00
7 of 32
Adjust
Zone 2
8
7
6
Zn
1
C
R
Com
1-2
Zn
2
M
M
Hi Stage
Lo Stage
Section B1
General Cooling
Section B2
Cooling Enable
Section B3
Cooling Control
Adjust
Adjust
Zone
1
20 21
Com tN1
1
tN1
2
22 23
Indr
2
Item
Menu
View
1
°
F
UnOcc
Cycle Length
Lo Stage
Hi Stage
Lo Stage
Hi Stage
Lo Stage
Hi Stage
On
Off
On
Off
On
On
Section A3: Two Stage Heating
TWO STAGE HEATING
In cases where a one stage heating system can not provide sufficient heat, a second stage of heat from an
additional heating terminal can be provided to supplement the first stage. A two stage heating system
therefore has one RTU or indoor sensor controlling two output relays: a
Lo stage relay and a Hi stage relay.
If an RTU is used to control a two stage heating zone, the RTU must be connected to an even
tN1 terminal
(i.e.
tN1 2, tN1 4 or tN1 6), and TWO must be selected through the STG NUM adjustment in the Zone Adjust
menu of the control. If an indoor sensor is used to control a two stage heating zone, the sensor must be
connected to an
Indr terminal (i.e. Indr 2, Indr 4 or Indr 6), and TWO must be selected through the STG NUM
adjustment in the Zone Adjust menu of the control. The odd numbered zone relay becomes the Lo Stage
and the even numbered zone relay becomes the Hi Stage.
Example
: An RTU connected between
Com
and
tN1 2 terminals (20 and 22) is used to
control the output relays
Zn 1 and Zn 2.
Relay
Zn 1 is the Lo stage output relay and
relay
Zn 2 is the Hi stage output relay.
PID Staging Logic
The temperature within each two stage zone is controlled by varying the
on time of the output relays over a cycle length. During light loads, the
369 cycles the
Lo Stage relay on and off. As the load increases, the Lo
stage relay on time increases until it reaches the maximum of the cycle
length. The
Hi stage relay is then turned on and its on time is increased
as the load increases. When the heating load decreases again, the on
time of the
Hi stage relay is reduced until the Hi stage relay is turned off
completely. The control then starts to reduce the on time of the
Lo
stage relay.
Section B: Cooling Operation
Section B1: General Cooling
GENERAL COOLING
The Zone Control 369 is capable of operating a single cooling group to provide either cooling enable (ENBL)
or cooling control (CTRL). This is an adjustable item through the COOL MOD setting in the Control Adjust menu
of the control. In order to prevent short cycling of the mechanical cooling unit, the 369 ensures the
Cooling relay
is operated for a minimum amount of time. The minimum run time (MIN RUN) and minimum off time (MIN OFF)
are adjustable settings in the Control Adjust menu of the control.
COOLING GROUP (CG)
A cooling group is a group of heating zones that are a part of a cooling zone. This function allows zones which
are assigned to the cooling group to be doing cooling, while zones which are not assigned to the cooling group
are heating. A heating zone can be assigned to the cooling group by selecting CG through the ZN COOL
adjustment in the Zone Adjust menu of the control. Zone 6 (
tN1 6 or Indr 6) is always a member of the cooling
group; therefore, there is no option for removing this zone from the cooling group.
COOLING INTERLOCK (INTRLOCK)
In order to prevent simultaneous heating and cooling, the 369 provides a cooling interlock. Once all the heating zones assigned to the
cooling group have been satisfied for a period of time, the control will allow cooling operation to occur. This time is adjustable through
the INTRLOCK setting in the Control Adjust menu of the control. Once any zone assigned to the cooling group requires heat, cooling
operation is terminated.
- 01/09
- 01/09
