IM 725 (1-02)
27
Figure 85 - Typical Electrical Locations, Vertical Floor Models AVS, AVV,
AVB, AVR, Front View, Access Panels Removed
Unit Mounted Microtech
™
Direct Digital Controls (DDC) Components
This Drawing shows the location of the standard and optional AAF
®
-HermanNelson
®
MicroTech
™
control items. The following is a general
description of these components.
1.
MicroTech Unit Ventilator Controller: This is a factory
mounted microprocessor-based DDC control device which is
capable of stand-alone control or network control from a front
end computer. The controller can support sixteen (16) inputs
and sixteen (16) outputs. Each input supports either analog
sensing and/or binary contact closure. Each output consists of
a binary contact closure to operate controlled devices. The
controller will provide status of either the outputs or the inputs
upon request from a personal computer connected either to a
network or an individual controller. The controller contains
self-diagnostic capability to maintain constant reliability. The
controller provides heating and cooling control in response to
various inputs as well as the room sensor which may be either
unit mounted or wall mounted. Damper actuators are precisely
positioned by means of step-and-wait parameters built into
control software. Two-position functions such as DX cooling/
heating and electric heating are also initiated by the controller.
Room temperature adjustment, unoccupied temperature offset
and outdoor air damper minimum position are all adjustable at
the controller. In a network system, these three adjustments
are not operative and are done as part of the network control
plan.
The controller provides a visual means of fault detection with
the use of status LED on board.
2.
Room Temperature Adjustments: This item controls the room
temperature setpoint.
3.
Terminal Strips as required: Provides convenient connection
points for the following:
a. Modulating steam or water control valve (factory wired).
b. Wall mounted room sensor.
c. Condensing unit control circuit (field wired by others).
4.
Damper Actuator(s): These devices position the outdoor and
room air dampers and bypass dampers (when furnished) in
response to the unit ventilator controller. Factory mounted,
wired and adjusted.
5.
Sampling Chamber: This enclosure houses the room air sensor
whenever a unit mounted sensor is specified. Room air is
continuously drawn through the sampling chamber to insure
fast accurate response to temperature changes within the room.
*6.
Time Clock Accessory: This device automatically cycles unit
through occupied and unoccupied modes in accordance with a
user programmed time schedule. Programming instructions
are included. Time clocks have battery backup so they will not
require resetting if electric power is interrupted. Located in
front of the room air fan motor.
7.
Electric Connection Box: Contains the motor speed switch,
motor speed transformer and fusetron(s) when furnished.
Wiring connections to the day/night relay and vent relay are
made in this box. Refer to the unit wiring diagram for
specifics.
8.
“High-Med-Low-Off” Motor Speed Switch: Allows user to
select the fan speed desired. The “Off” position shuts unit
down completely.
9.
Right End Compartment:Class 1 wiring required.
10.
Unit Main Power “On-Off” Switch: Disconnects main power
to unit for servicing the unit or when unit is to be shut down for
an extended period.
11.
Left End Compartment: Class 2 wiring permitted.
*Not furnished with network units since the function is handled through the
communication network.
Motor
5
4
8
9
10
11
7
2
1
3
6*
J6
J7
J8
J9
LED
RELAY OUT
AUX OUT
STATUS
POWER
PWR
G 0
H 1
2
3
4
5
6
7
8
V
9
10
G 24V
1
2
3
1
2
3
4
5
6
R
5
4
3
2
1
0
G S G S G
S G S G S G S G S G S
G S1 S0
COMMB
COMM A
DIGITAL INPUT
IN 13 IN 12 IN 7 IN 6 IN 5 IN 4 IN 3 IN 2
IN 1. 0
J1
J2
J3
J4
J5
MicroTech
®
325 Controller
This devise complies with Part 15 of the FCC rules.
Operation is subject to the following 2 conditions:
(1) This device may not cause harmful interference.
(2) This device must accept any interference received, including
interference that may cause undesired operation.
C
®
File E159169
Model 325
Part No. 107627201
J1
J2
J3
J4
J5
COOLING SETPOINT IS
FACTORY SET 6
°
F ABOVE
HEATING SETPOINT
HI
LO
NETWORK
ADDRESS
%
°
F
°
F
MINIMUM OA
UNOCCUPIED
HEATING SETPOINT
POSITION
OFFSET
30
40
50
20
10
75
0
100
0
20
10
15
5
70
65
75
60
80
J6
J7
J8
STATUS
POWER
J9
012
3
4
5
67
89
A
B
C
D
EF
012
3
4
5
67
89
A
B
C
D
EF
Remote Status
LED Output
Relay
Outputs
Auxiliary
Outputs
(TRIAC)
Status
LED
Power Supply
LED
Electro-Mechanical
Relays
Hex
Switches
Digital
Inputs
Communication
Ports
Analog
Inputs
Heating Setpoint Pot
Minimum OA
Damper
Position Pot
Unoccupied
Offset Pot
Figure 87 - MicroTech Controller
Figure 86 - Sensor Locations
Discharge Air Sensor
Room Air Sensor
Holes in Front
Access Panel
Outdoor Air Sensor
Outdoor Air
Opening