SMC 2450 Telecom Facility Environment Controller Owner's Manual
SMC 2450 Telecom Facility Environment Controller is a versatile device designed to monitor and control various environmental parameters in telecommunication facilities. With its advanced capabilities, it ensures optimal operating conditions for critical equipment, preventing costly downtime and service disruptions.
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Sierra Monitor Corporation
1991 Tarob Court, Milpitas, CA 95035
(408) 262-6611
(800) 727-4377
(408) 262-9042 - Fax
E-mail: [email protected]
Web Site: www.sierramonitor.com
Model 2450 / 2490 / 2495
E N V I R O N M E N T
C O N T R O L L E R
Version 1.0
UL Recognized
Approved
APPLICABILITY & EFFECTIVITY
Effective for all Model 2450 systems manufactured after July 1, 1996.
Instruction Manual Part Number T10014
Instruction Manual Environment Controller
Model 2450
TABLE OF CONTENTS
1. TABLE OF CONTENTS .......................................................................................................................................................i
1. PRODUCT DESCRIPTION ..............................................................................................................................................1-1
1.1. G ENERAL ............................................................................................................................................................................1-1
1.2. S PECIAL F EATURES .............................................................................................................................................................1-1
1.3. F ACTORY C ONFIGURATION .................................................................................................................................................1-1
1.4. C OMPUTER I NTERFACE .......................................................................................................................................................1-2
1.5. P OWER R EQUIREMENTS ......................................................................................................................................................1-2
2. CAUTIONS AND WARNINGS.........................................................................................................................................2-1
2.1. I NTRODUCTION ...................................................................................................................................................................2-1
2.2. C ONTROLLER ......................................................................................................................................................................2-1
2.3. W IRING ...............................................................................................................................................................................2-1
2.4. E XTERNAL S ENSORS AND A CTUATORS ...............................................................................................................................2-1
2.5. O PERATOR C AUTIONS .........................................................................................................................................................2-1
2.6. S ECONDARY P OWER S OURCE FOR M ODEL 2490.................................................................................................................2-1
3. INSTALLATION................................................................................................................................................................3-1
3.1. C OMPONENT M OUNTING ....................................................................................................................................................3-1
3.1.1. Controller (2450) ......................................................................................................................................................3-1
3.1.2. Interface Module (2490).............................................................................................................................................3-1
3.1.3. Alarm Connection Module (2495)..............................................................................................................................3-1
3.2. R IBBON C ABLES .................................................................................................................................................................3-1
3.2.1. Controller ...................................................................................................................................................................3-2
3.2.2. Alarm Connection Module .........................................................................................................................................3-2
3.3. C USTOMER W IRING ............................................................................................................................................................3-2
3.3.1. Interface Module ........................................................................................................................................................3-2
3.3.2. Alarm Connection Module .........................................................................................................................................3-2
3.4. P OWER UP ...........................................................................................................................................................................3-2
3.5. P OWER D OWN ....................................................................................................................................................................3-3
4. OPERATION ......................................................................................................................................................................4-1
4.1. I NTRODUCTION ...................................................................................................................................................................4-1
4.1.1. Indicators ...................................................................................................................................................................4-1
4.1.2. Controls......................................................................................................................................................................4-1
4.2. M ODES OF O PERATION .......................................................................................................................................................4-2
4.2.1. Run Mode ...................................................................................................................................................................4-2
4.2.1.1. Normal .................................................................................................................................................................................... 4-2
4.2.1.2. Comfort ................................................................................................................................................................................... 4-2
4.2.1.3. Purge ....................................................................................................................................................................................... 4-3
4.2.1.4. Inhibit...................................................................................................................................................................................... 4-3
4.2.2. View Mode..................................................................................................................................................................4-3
4.2.2.1. View Mode Operation............................................................................................................................................................. 4-3
4.2.3. Test Mode ...................................................................................................................................................................4-3
4.2.3.1. Manual Test ............................................................................................................................................................................ 4-4
4.2.3.2. Automatic Test ........................................................................................................................................................................ 4-5
4.2.4. Sensor Maintenance Mode .........................................................................................................................................4-5
4.2.4.1. Calibrate.................................................................................................................................................................................. 4-5
4.2.4.2. Sensor Mapping ...................................................................................................................................................................... 4-5
4.2.5. Other Operation .........................................................................................................................................................4-6
4.2.5.1. Warm-up ................................................................................................................................................................................. 4-6
4.2.5.2. Door Open Switch Operation.................................................................................................................................................. 4-6
4.2.5.3. Reset ....................................................................................................................................................................................... 4-7
4.3. LED I NDICATORS ...............................................................................................................................................................4-7
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Instruction Manual Environment Controller
Model 2450
4.3.1. Mode Indicators......................................................................................................................................................... 4-7
4.3.2. Alarm Status Indicators ............................................................................................................................................. 4-8
4.3.3. Control Status Indicators........................................................................................................................................... 4-9
4.4. V ACUUM F LUORESCENT D ISPLAY (O PTION ))................................................................................................................... 4-10
4.5. O THER C ONTROLLER O PERATIONS .................................................................................................................................. 4-10
5. CALIBRATION ................................................................................................................................................................. 5-1
5.1. C ALIBRATION O VERVIEW ................................................................................................................................................... 5-1
5.2. C ALIBRATION P ROCEDURE ................................................................................................................................................. 5-1
5.2.1. Calibration Keyboard Process .................................................................................................................................. 5-1
5.2.2. Calibration Sensor Process ....................................................................................................................................... 5-2
5.2.3. Calibration Notes: ..................................................................................................................................................... 5-2
6. MAINTENANCE & SERVICE ........................................................................................................................................ 6-1
6.1. G ENERAL R EQUIREMENTS ................................................................................................................................................. 6-1
6.2. S ENSORS ............................................................................................................................................................................ 6-1
6.3. T ROUBLESHOOTING ........................................................................................................................................................... 6-1
6.4. C ONTROLLER R EMOVAL .................................................................................................................................................... 6-1
6.5. I NTERFACE M ODULE R EMOVAL ......................................................................................................................................... 6-2
7. SERIAL INTERFACES .................................................................................................................................................... 7-1
7.1. PC C ONNECTIONS .............................................................................................................................................................. 7-1
7.1.1. Modem ....................................................................................................................................................................... 7-1
7.1.2. Direct ......................................................................................................................................................................... 7-1
7.2. H AND H ELD ....................................................................................................................................................................... 7-1
8. APPENDICES .................................................................................................................................................................... 8-1
8.1. A PPENDIX A: M ODEL 2450/2490 S PECIFICATIONS ............................................................................................................ 8-1
8.2. A PPENDIX B: L IMITED W ARRANTY ................................................................................................................................... 8-4
8.3. A PPENDIX C. P RODUCT N UMBERING ................................................................................................................................ 8-5
8.3.1. Model Numbers.......................................................................................................................................................... 8-5
8.3.2. Options ...................................................................................................................................................................... 8-5
8.3.3. Spare Parts ................................................................................................................................................................ 8-6
8.4. A PPENDIX E - D ATA I NTERFACE S CREENS ......................................................................................................................... 8-7
8.4.1. Description ................................................................................................................................................................ 8-7
8.4.2. Computer Terminal Instructions................................................................................................................................ 8-7
8.4.2.1. Security PIN Codes................................................................................................................................................................. 8-7
8.4.2.2. Set Point Changes ................................................................................................................................................................... 8-8
8.4.3. Hand Held Terminal Instructions .............................................................................................................................. 8-8
8.4.4. View Mode Instructions ............................................................................................................................................. 8-9
8.4.5. Computer Screens.................................................................................................................................................... 8-10
Page: ii
Instruction Manual Environment Controller
Model 2450
1. Product Description
1.1. General
The Model 2450 Environment Controller provides electronic, microprocessor-based sensing and control of heating, ventilation and air conditioning (HVAC) and other environmental conditions in remote telecommunications structures including various huts, cabinets and vaults. Specialized software is used to collect data from sensor inputs and make continuous, real time, control and alarm logic decisions. The results of the logic are used to operate control outputs, send alarms to telephone company systems, and display alarm conditions on the front panel of the controller.
1.2. Special Features
A unique aspect of the
Model 2450 is that environmental sensors, required for most telephone company applications, are integrated into the controller design. These sensors include temperature, humidity, combustible gas, carbon monoxide, oxygen and hydrogen sulfide. The design also provides for easy direct connection of additional temperature and humidity sensors as components, eliminating the need for expensive external signal conditioning electronics.
Power supply and alarm input connections provide a standard smoke detector interface. Spare industry
Figure 1-1
Model 2450 Environment Controller standard 4-20 mA inputs allow for other sensors to be added without mechanical retrofit of the controller.
There are three assemblies required for installation of the environment controller. These include the Model 2450
Environment Controller, a Model 2490 Interface Module, and a Model 2495 Alarm Connection Module. Figure
1-2 provides a logic block diagram of the three components. Various configurations of each model are denoted by a two digit suffix to the base model number.
1.3. Factory Configuration
Model 2450 controllers are supplied with factory default setpoints which match specific applications. Setpoints can be changed via a computer interface.
Page: 1-1
Instruction Manual Environment Controller
Model 2450
1.4. Computer Interface
Model 2450 controllers are designed for convenient external interface via either direct or modem personal computer (PC) connection or via a hand held terminal. (See Section 7) The controller automatically recognizes the method of communication at the time of any connection:
•
Computer: The controller recognizes that the calling device is a computer operating in terminal mode and returns a menu onto the screen of the terminal. When the computer operator selects an alpha character corresponding to a menu choice, a sub-menu or data form is returned by the controller. This method of communication avoids the need for use of a specific software package for which the operator would require training.
•
Hand Held Terminal: A specially configured hand held terminal can be used to process inquiries by pressing labeled keys on the terminal.
Response by the controller is similar to the response to a computer.
-48
VDC
Telephone Modem
Connection
Power
Supply
Digital Inputs &
External Sensor
Inputs
24
VAC
Model 2495
Alarm Connection
Module
Model 2450
Environment
Controller
Model 2490
Interface Module
120
VAC
Alarm Outputs to
Telephone Company
Control
Outputs
Tel Co.
Monitoring
Tel Co.
-48VDC P/S
Keypad Input
LED Indicators
VFD Display
Control
Outputs
Sensor
Inputs
Figure 1-2
Environment Controller Interface Block Diagram
1.5. Power Requirements
Model 2450 controllers operate from a 5 VDC power supply located on the Model 2490 Interface Module.
Model 2490 Interface Modules contain the following power supplies:
•
Primary Power: 110 VAC input, +5 VDC output—for primary controller power
•
Secondary Power: -48 VDC input, +5 VDC output—for back-up controller power. This supply will be automatically switched into use when 110 VAC Primary power is lost. The -48 VDC input is protected against over-voltage to -66 VDC. It is recommended that the -48 VDC secondary power source be current limited to 1.0 Amp maximum.
Page: 1-2
Instruction Manual Environment Controller
Model 2450
Figure 1-3
Model 2450 Outline Dimensions
Page: 1-3
Instruction Manual
Figure 1-4
Model 2490-00- Interface Module
Environment Controller
Model 2450
Figure 1-5
Model 2490 -Mechanical Detail
Page: 1-4
Instruction Manual Environment Controller
Model 2450
Figure 1-6
Model 2495 - Mechanical Details
Page: 1-5
Instruction Manual Environment Controller
Model 2450
2. Cautions and Warnings
2.1. Introduction
The Environment Controller is designed and constructed for installation on a vertical surface in a structure which provides protection from "hostile" environments such as rain or excessive dust. Caution should be taken to insure that the installation is made in compliance with this instruction manual and any applicable electrical codes.
2.2. Controller
Install the controller in a location which will insure that the gas, temperature and humidity sensors are exposed to the ambient environments and are not blocked from air flow or diffusion. The gas, temperature and humidity sensors are installed under the slotted cover at the top of the controller. Do not tightly surround the controller with other equipment which might limit exposure to ambient air, temperatures and gases.
The only devices which are to be connected to the controller are ribbon cables supplied by Sierra Monitor with matching “D” connectors. The only sensors to be installed in the gas sensor sockets are sensors supplied by
Sierra Monitor for use in Environment Controllers.
2.3. Wiring
Wiring connections to the Interface Module must be in accordance with National Electric Code and wires must be sized based on the maximum calculated load.
2.4. External Sensors and Actuators
External temperature and humidity sensors connected to the Interface Module must be supplied by, or approved by, Sierra Monitor. All other external sensors and actuators are the responsibility of the installer.
2.5. Operator Cautions
Do not enter the structure if a local alarm (red light and/or audible alarm) is on. Follow established, prescribed procedures until the alarm condition is removed.
If an alarm occurs while you are inside a structure follow established, prescribed procedures or immediately evacuate the structure until an authorized person determines that it is safe to return to the structure.
2.6. Secondary Power Source for Model 2490
The -48 VDC secondary power source for Model 2490 Interface Modules must be current limited to 1.0 Amp maximum. Do not connect the system to a DC power source that does not meet this requirement.
Page: 2-1
Instruction Manual Environment Controller
Model 2450
3. Installation
3.1. Component Mounting
The following sections provide instructions for installation of each of the three major components of the environment controller. Installation and wiring of all components and interface devices must be made in accordance with National Electrical Code.
3.1.1. Controller (2450)
Installation location of the controller is determined by the structure design: The controller can be installed on the outside of the door of the control cabinet which is generally situated beside or below the electrical distribution cabinet.
The Controller is attached to the door of the control cabinet by four threaded studs located on the back of the controller.
In addition to the holes for the mounting studs, slots are required to be cut on the door to provide access to three interface connectors and one grounding stud on the back face of the controller. The grounding stud on the controller must be connected to earth ground.
Figure 3.1 provides details for the mounting holes and the access slot. A full size drilling template can be obtained from
Sierra Monitor.
3.1.2. Interface Module (2490)
The interface module should be installed inside the control cabinet in a manner which allows separation of low voltage and high voltage wiring. Due to the routing of ribbon cables between the interface module and the controller it is recommended that the interface module be installed in the left side of the cabinet closest to the hinged door.
Figure 3-1
Mounting Details
The interface module is supplied mounted on a carrier plate which has four holes for screw mounting to the control panel plate.
3.1.3. Alarm Connection Module (2495)
The Alarm Connection Module is generally installed immediately above, or to the right of the control cabinet.
Select a location which allows easy access by telephone company installers who will connect the alarm outputs, phone line and DC power. The installer will need to make conduit hub knock-outs in the enclosure to match installation requirements. Conduits must be 3/4” minimum to allow cable connector feed through. (See Figure
1-6).
3.2. Ribbon Cables
All connections between the Controller, Interface Module and Alarm Connection Module are by ribbon cable supplied with the original equipment.
Page: 3-1
Instruction Manual Environment Controller
Model 2450
3.2.1. Controller
Two ribbon cables, supplied with the Model 2450 Controller provide all the required interconnections to the Model 2490
Interface Module. The cables are correctly sized and their connectors are gendered so that they cannot be misconnected.
Install the two 37-conductor cables between the back of the
2450 and the two corresponding connectors on the 2490 interface board. (See Figure 3-2).
Alarms
Input/Output
3.2.2. Alarm Connection Module
One ribbon cable, supplied with the Model 2495 Alarm
Connector Module, provides all the required interconnections to the Model 2450 Controller.
Connect the 37 conductor cable to the vertical “D” connector on the back of the 2450 and feed the other end into the Alarm
Connection Module for connection into the “D” connector on the PCB assembly.
Figure 3-2
Ribbon Cable Connectors
Rear View of Model 2495
Note that only one incoming phone line can be connected to the modem. This can be via, either, the phone jack on the side of the Controller, or the two position telephone connector on the Alarm Connection Panel.
3.3. Customer Wiring
3.3.1. Interface Module
Figures 3-3 through 3-5 provide details of the use of each of the wiring terminals on the Interface Module.
Specific user configurations and control requirements will dictate which of the wiring positions will be used for each application.
3.3.2. Alarm Connection Module
Figure 3-6 provides details of the use of each of the wiring terminals on the Alarm Connection Module. Specific user configurations and control requirements will dictate which of the alarms should be connected by the telephone company.
3.4. Power up
Install and inspect all interface wiring and controlled devices prior to power up of the controller.
The controller can be powered up by either the 110 VAC supply or the -48 VDC supply, or both, in either order.
When power is turned on the controller will perform a 5-minute warm-up, during which none of the inputs will be processed and no alarm will be generated. To indicate that the warm-up is in progress the alarm indicator lights on the front panel will turn on and off in a vertical (walk) sequence.
After initial power up, manual or automatic tests can be performed to insure that each of the controlled devices is functioning. These tests are described in the operation section of the manual.
When the controller has not been in operation for an extended period, such as storage before installation, the real time clock will be incorrect. It is generally not necessary to reset the clock until the structure is placed into full time operation. A computer terminal or hand held terminal is required to set the clock.
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Instruction Manual Environment Controller
Model 2450
3.5. Power Down
All user-configured parameters and collected history data is saved in non-volatile EEPROM memory. No data will be lost due to a power interruption or extended power outage. If it is necessary to power down the controller, remove both AC and DC power sources.
Page: 3-3
Instruction Manual Environment Controller
Model 2450
24 VAC Neutral
Controls
TB2, TB3
25
26
27
28
29
30
31
32
13
14
15
16
9
10
11
12
7
8
5
6
3
4
1
2
21
22
23
24
17
18
19
20
24 VAC Source
Sump Pump
Emergency
Lights
Green
Indicator
Red
Indicator
DC Fan
Auxiliary 1
Auxiliary 2
Digital Input I
Dehumidifier
Air Damper
Main Lights
Blower
Heater
A/C 2
A/C 1
Connector Legend
20
21
22
23
24
15
16
17
18
19
25
26
27
28
29
30
31
32
6
7
8
9
10
11
12
13
14
2
3
4
5
# Connector Marking
1 TB2 Dehumidifier +
TB2
TB2
TB2
TB2
Dehumidifier -
Air Damper +
Air Damper -
Main Lights +
TB2
TB2
TB2
TB2
TB2
TB2
TB2
TB2
TB2
Main Lights -
Blower +
Blower -
Heater +
Heater -
A/C 2 +
A/C 2 -
A/C 1 +
A/C 1 -
TB2
TB2
TB3
TB3
TB3
TB3
TB3
TB3
TB3
TB3
TB3
TB3
TB3
TB3
TB3
TB3
TB3
TB3
24 VAC Input +
24 VAC Input -
Sump Pump +
Sump Pump -
Emergency Lights +
Emergency Lights -
Green Indicator +
Green Indicator -
Red Indicator +
Red Indicator -
DC Fan +
DC Fan -
Aux 1 +
Aux 1 -
Aux 2 +
Aux 2 -
(Digital Input) I +
(Digital Input) I -
FIELD WIRING
INTERNAL
Figure 3-3
Wiring Connections - Controls
SMC sierra monitor corporation
Model 2490
Interface Module
Controls Wiring Connections
Page: 3-4
Instruction Manual Environment Controller
Model 2450
25
26
27
28
21
22
23
24
17
18
19
20
13
14
15
16
29
30
31
32
7
8
5
6
3
4
1
2
9
10
11
12
Digital Inputs
TB4, TB5
Digital Input A
Digital Input B
Digital Input C
Digital Input D
Digital Input E
Digital Input F
Digital Input G
Digital Input H
Pump Off Switch
AC Failure
Pump On Switch
High Water
Duct Sail
Door Open
Smoke alarm
Intrusion Alarm
Connector Legend
20
21
22
23
24
15
16
17
18
19
25
26
27
28
29
30
31
32
6
7
8
9
10
11
12
13
14
2
3
4
5
# Connector Marking
1 TB4 Digital Input A +
TB4
TB4
TB4
TB4
Digital Input A -
Digital Input B +
Digital Input B -
Digital Input C +
TB4
TB4
TB4
TB4
TB4
TB4
TB4
TB4
TB4
Digital Input C -
Digital Input D +
Digital Input D -
Digital Input E +
Digital Input E -
Digital Input F +
Digital Input F -
Digital Input G +
Digital Input G -
TB4
TB4
TB5
TB5
TB5
TB5
TB5
TB5
TB5
TB5
TB5
TB5
TB5
TB5
TB5
TB5
TB5
TB5
Digital Input H +
Digital Input H -
Pump Off Sw. +
Pump Off Sw. -
AC Failure +
AC Failure -
Pump On Sw. +
Pump On Sw. -
High Water +
High Water -
Duct Sail Sw. +
Duct Sail Sw. -
Door Open +
Door Open -
Smoke Alarm +
Smoke Alarm -
Intrusion Alarm +
Intrusion Alarm -
FIELD WIRING
INTERNAL
Figure 3-4
Wiring Connections - Digital Inputs
SMC sierra monitor corporation
Model 2490
Interface Module
Digital Input Wiring Connections
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Instruction Manual Environment Controller
Model 2450
Analog I/O
TB-6
7
8
5
6
3
4
1
2
9
10
11
12
+
-
+
-
+
-
+
-
+
-
1
2
3
+
-
17
18
19
13
14
15
16
20
Tel/ Co. Power
TB-8
48 VDC +
48 VDC +
Comm
Comm
1
2
3
4
Main Power
TB-1
+
-
+ VDC
Comm.
Hot
Neutral
Ground
Analog Output
Analog Input 2
Analog Input 1
External RH Sensor
Internal Temp. 2
Internal Temp. 1
External Temp.
Smoke Detector 12 VDC
Heater
A/C 1
- 48 VDC Source
-48 VDC
H
N
G
110 VAC
Source
Connector Legend
20
21
22
23
24
15
16
17
18
19
6
7
8
9
10
11
12
13
14
2
3
4
5
# Connector Marking
1 TB6 Analog Output +
TB6
TB6
TB6
TB6
Analog Output -
Analaog Input 2 +
Analog Input 2 -
Analog Input 1 +
TB6
TB6
TB6
TB6
TB6
TB6
TB6
TB6
TB6
Analog Input 1 -
External RH +
External RH -
Internal Temp. 2 +
Internal Temp. 2 -
Internal Temp. 1 +
Internal Temp. 1 -
External Temp. +
External Temp. -
TB6
TB6
TB7
TB7
TB7
TB7
TB8
TB8
TB8
TB8
Smoke Det. +12 VDC
Smoke Det. DC Gnd
Heater
Heater
A/C 1
A/C 1
48V +
48V +
48V -
48V -
FIELD WIRING
INTERNAL
Figure 3-5
Wiring Connections - Analog I/O
SMC sierra monitor corporation
Model 2490
Interface Module
Analog I/O Wiring Connections
Page: 3-6
Instruction Manual Environment Controller
Model 2450
Telco Connections
31
32
33
34
27
28
29
30
35
36
37
38
19
20
21
22
15
16
17
18
23
24
25
26
5
6
3
4
1
2
9
10
7
8
11
12
13
14
FIELD WIRING
Oxygen Alarm
CO Alarm
Combustible Alarm
Smoke Alarm
Vent Sail Alarm
High Temp. Alarm
High Humidity Alarm
High Water Alarm
Pump Run Alarm
Malfunction Alarm
H2S Alarm
AC Failure Alarm
Intrusion Alarm
Gas Det. Trouble
Motor Current Alarm
Spare Alarm 1
Spare Alarm 2
Phone
48 VDC Pass Through
INTERNAL
Connector Legend
25
26
27
28
29
30
31
32
33
34
35
36
37
38
20
21
22
23
24
15
16
17
18
19
6
7
8
9
10
11
12
13
14
2
3
4
5
# Connector Marking
1 TB2 Oxygen
TB2
TB2
TB2
TB2
Oxygen
CO
CO
Comb
TB2
TB2
TB2
TB2
TB2
TB2
TB2
TB2
TB2
Comb
Smoke
Smoke
Vent Sail
Vent Sail
High Temp
High Temp
High Humidity
High Humidity
TB2
TB2
TB2
TB2
TB2
TB3
TB3
TB3
TB3
TB3
High Water
High Water
Pump Run
Pump Run
Malfunction
Malfunciton
H2S
H2S
AC failure
AC Failure
TB3
TB3
TB3
TB3
TB3
TB3
TB3
TB3
TB3
TB3
TB4
TB4
TB1
TB1
Intrusion
Intrusion
Gas Det Trouble
Gas Det Trouble
Motor Current
Motor Current
Spare 1
Spare 1
Spare 2
Spare 2
Phone 1
Phone 2
48 VDC +
48 VDC -
SMC sierra monitor corporation
Model 2495
Alarm Connection Module
Alarm Wiring Connections
Figure 3-6
Wiring Connections - Alarm Connection Module
Page: 3-7
Instruction Manual Environment Controller
Model 2450
4. Operation
4.1. Introduction
The Model 2450 provides continuous automatic control of environmental conditions within the structure and initiates alarms when abnormal conditions cannot be corrected. The controller automatically tightens limits when the structure is occupied and returns to wider limits when the structure is not occupied. Under normal circumstances, the only operator action required is to press a key to confirm that the structure is occupied.
The front panel (Figure 4-1) contains a display area and a keypad. The display has 28 LED indicators for mode, alarm and control status, and the keypad contains 6 push-button key switches. The function and use of the indicators and key switches are described in the following sections.
4.1.1. Indicators
The LED indicators are separated into three functional blocks:
•
Run Mode ( 4 LED s). Only one Run Mode can be active at any time, so only one Mode LED will normally be on, and the other three will be off.
•
Control Status (14 LED s). Various combinations of control devices may be active at any time based on the environmental control logic and the occupied status of the structure.
•
Alarm status (10 LED s). Any combination of alarm conditions may exist, but generally, no alarms should be present if the structure controls are operating correctly.
The LED indicators also provide feedback to the operator during other special operations, such as during calibration or test. During testing, the 14 control device indicators retain their normal functions, while the remaining LED s are used to show which of the control devices is selected for test. During calibration, the four gas alarm indicators have special functions to indicate the status of the calibration process.
4.1.2. Controls
The six push-button control keys include two reset keys on either end of the row and four function keys. The reset keys are spaced to either side of the panel to avoid accidental resetting of the controller. When it is necessary to reset, both keys must be pressed at the same time.
There are two labels for each of the four function keys. The primary labels (N, C, P, I) correspond to the
NORMAL
,
COMFORT
,
PURGE
, and
INHIBIT
Run Modes, respectively. The secondary labels (
UP
,
DOWN
,
ON
,
OFF
) correspond to key functions during
TEST
.
Table 4-1 provides an overview of operator key press sequences. In this manual “Press” a key means a momentary activation of the key.
“Hold” a key means depress and hold the key for five seconds, then release. Whenever it is necessary to “Hold” a key, a change in visual status will indicate that the key has been held long enough.
In one case, activation of test modes, it is necessary to press a key within 2 seconds after a previous key press. In all other key press or hold steps, there is no minimum time requirement between operator actions.
Figure 4-1
Model 2450 Control Keys
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Instruction Manual Environment Controller
Model 2450
4.2. Modes of Operation
There are four modes of operation; and
SENSOR MAINTENANCE modes are identified by unique bold capital letters.
Table 4-1 lists the modes, sub modes, and the primary control key presses to enter each mode.
When the structure is not occupied it automatically reverts to
NORMAL
operation.
RUN , VIEW
,
TEST
. For most modes there are sub modes. In this manual modes and sub
RUN
VIEW
TEST
MODE SUB MODE
NORMAL
CONTROL KEY
Press N.
COMFORT Press C
PURGE
Press P.
INHIBIT
VIEW
MANUAL
Press I.
Hold N.
Reset, then Press UP
SENSOR
AUTOMATIC Reset then Press OFF
CALIBRATE In COMFORT , Hold C
MAINTENANCE MAP In CALIBRATE , Hold C
When the structure is occupied, any of the modes of operation can be manually selected. When any of the run modes are active, the corresponding mode LED will flash slowly.
COMFORT
is
Table 4-1
Modes and Control Keys automatically initiated when the structure is occupied unless this feature is turned off by changing set points.
Special key entry combinations to activate
VIEW
,
TEST
and
SENSOR MAINTENANCE
are discussed in further detail in this chapter. There are various timer states and special functions, including calibration delays, sensor warm-up, sensor failure and sensor mapping, that are be mentioned where appropriate.
4.2.1. Run Mode
4.2.1.1. Normal
The default mode of operation, which is automatically initiated when the structure is unoccupied, is
NORMAL
.
In
NORMAL
, the lights are off, the maximum and minimum temperatures are extended to save energy by reducing heating or air conditioning demands, gas alarm levels are increased to facility protection levels, and sump pump and dehumidifier functions are active. Any of the following conditions activate
NORMAL
:
•
The controller has been reset and the warm-up timer has cleared.
•
The N key is pressed, when the controller is in one of the run modes.
•
PURGE , INHIBIT , COMFORT or
CALIBRATE
have timed out.
4.2.1.2. Comfort
The typical mode of operation when a structure is occupied is
COMFORT
.
COMFORT
is automatically activated when the door has been opened and the structure is safe for entry.
In
COMFORT
, the lights are on, the maximum and minimum temperatures are contracted to provide heating or air conditioning comfort for occupants, the gas alarm levels are tightened to personnel protection levels, and sump pump and dehumidifier functions are active.
COMFORT
is activated when:
•
The structure door is opened.
•
The C key is pressed momentarily.
Conditions or actions which usually cause the controller to exit
COMFORT
are:
•
A different mode key is pressed.
•
The structure’s door is closed and no function key is pressed within six minutes.
•
Two hours have elapsed since
COMFORT
was initiated.
Run Mode
C
Press
COMFORT
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Instruction Manual Environment Controller
Model 2450
4.2.1.3. Purge
Run Mode
PURGE
is used to force ventilate structures which use static damper control.
PURGE
is automatically activated when the structure door is first opened.
PURGE
can also be initiated by pressing the P key when the controller is in another run mode.
P
Press
PURGE
In
PURGE
, all HVAC, sump pump, and dehumidifier logic functions are active and the blower is always on. All temperature set points retain their
NORMAL
or
COMFORT
settings based on the mode immediately preceding activation of
PURGE
.
PURGE
times out, but can be stopped by pressing any other key.
•
In structures using static damper control,
PURGE
opens the damper and runs the blower for five minutes.
(Note that
PURGE
will not run if there is a smoke alarm.)
•
In structures using dynamic damper control,
PURGE
opens the damper to maximum, continues the constant blower operation and activates the DC fan if it is installed.
4.2.1.4. Inhibit
INHIBIT
can be used by a craftsperson to turn off the HVAC equipment to quiet the structure for a short period of time. In this mode, all blower, air conditioner, sump pump and dehumidifier activity is inhibited for five minutes. To start
INHIBIT
, press the I key.
INHIBIT
can be interrupted after it has been started by pressing any other function key.
INHIBIT
can be activated only when it is safe to turn off all the control devices.
INHIBIT
will be terminated and the controller will return to
NORMAL
if any alarm occurs.
Run Mode
I
Press
INHIBIT
4.2.2. View Mode
Run Mode
N
Hold
VIEW
Controllers with the optional Vacuum Fluorescent Display (VFD) continuously show the temperature and humidity when the structure is occupied and the controller is in one of the Run
Modes. When the exit procedure is in progress a warning message is displayed to prompt an operator to press a key to keep the lights on if required.
To view other status conditions on the VFD the controller must be placed in the
VIEW
mode.
4.2.2.1. View Mode Operation
To enter
VIEW
hold the
NORMAL
key. The VFD will change to display the structure control number.
To exit to run mode hold the
NORMAL
key. The VFD returns to temperature and humidity display.
VIEW
operation is similar to hand held terminal operation except that there is no access for set point changes
•
To advance between groups (Status, Log, Set Points) press
ON
•
Within groups, to advance between families (e.g. Inputs, Controls etc.) press
OFF
•
Within a Family to move between data lines press
UP
,
DOWN
.
4.2.3. Test Mode
MANUAL TEST
and
AUTOMATIC TEST
, can be used to activate control equipment during start-up or servicing of the structure. In both modes, the 14 Control Status indicators retain their normal functions, while the remaining alarm and mode indicators become indicators of which control device is selected for test activation.
•
MANUAL TEST
should be used when more than one control device is to be operated concurrently or when only selected devices are to be activated.
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Instruction Manual Environment Controller
Model 2450
•
AUTOMATIC TEST
should be used when sequential activation of each of the control devices is required, such as during customer acceptance or routine inspection.
4.2.3.1. Manual Test
To run
MANUAL TEST
:
1. Press both Reset keys concurrently, followed immediately by the Up key. The
INHIBIT
indicator will then blink at 2 blinks per second, and the remaining mode indicators will be on to indicate that the controller is ready to run
MANUAL
Test.
Run Mode
* *
Reset
2. Press the
DOWN
key. The top Alarm Status light will turn on and the
INHIBIT light will continue to blink. The Test Mode is now active, and any control device can be selected for activation.
Warm-up
N
< 2 Secs
3. Use the
UP
and
DOWN
keys to advance the status indicator to select the required control device. When the selection is correct press the
ON
key to activate the device.
MANUAL TEST
•
To activate multiple control devices, leave the first one on, advance the selection to other devices and press
ON
for each additional selection.
•
When the blinking
INHIBIT
indicator is the only active LED in the left column, the Auxiliary 2 control device is selected and can be manually turned on or off.
N: Up
C: Dn
P: On
I: Off
•
When the Red Indicator LED is selected (
NORMAL LED is on) the devices which will be activated, by pressing
ON
, will be all the alarm relays in the
Model 2495.
* *
Reset
•
When the Air Damper LED is selected, in addition to turning on the damper relay output, the controller will change the Analog Output from 2 VDC to 10 VDC.
4. To turn control devices off, move the selection to the required device and press
OFF
.
5. When the tests are complete, press both Reset keys concurrently to reset the controller. The controller will first enter warm-up mode and then return to
NORMAL
.
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Instruction Manual Environment Controller
Model 2450
4.2.3.2. Automatic Test
To run
AUTOMATIC
Test:
Run Mode
* *
Reset
1. Press both
RESET
keys concurrently, followed immediately by the I key. The
INHIBIT
indicator will then blink at 2 blinks per second, and the remaining Mode indicators will turn on and off sequentially indicating that the controller is ready to run
AUTOMATIC
Test.
Warm-up
I
< 2 Secs
2. Press the DOWN key. The top Alarm Status light and the top control device will turn on simultaneously indicating the current
AUTOMATIC
Test step. After a pre-set period, the test will advance down to the next indicator and control device.
AUTOMATIC
Test will continue sequentially, device by device, until interrupted.
AUTO TEST
3. To interrupt the test, press the DOWN key again. The test will stop at the current step.
C
Start
4. To resume the test, press the DOWN key, and the automatic sequence will restart at the next control device..
Run
AUTO TEST
P: On
I: Off
5. When the tests are complete, press both
RESET
keys concurrently to reset the controller. The controller will first enter warm-up mode and then return to
NORMAL
.
4.2.4. Sensor Maintenance Mode
* *
Reset
4.2.4.1. Calibrate
Periodic calibration of gas sensors is required to assure accurate and reliable operation. The manufacturer recommends calibration every six months. This section provides a summary of the controller’s operation during
CALIBRATE
.
Refer to Chapter 5, Calibration, for the complete calibration procedure.
Run Mode
C
Press
There are three phases to the calibration process—start calibration, apply calibration gas, and end calibration. Calibration is started by first selecting
COMFORT
(press C) and then by selecting
CALIBRATE
(hold C).
COMFORT
C
Hold
The controller takes calibration readings from all the gas detection sensors while calibration gas is being applied, and then it automatically stores this information in its memory. The calibration gas is an accurate mixture of all the gases needed to calibrate all the gas detection sensors. The calibration data will not be lost should power ever be removed from the controller. Operator actions and controller responses and indications during each phase of calibration are described in detail in Chapter 5.
CALIBRATE
C
Hold
MAPPING
4.2.4.2. Sensor Mapping
Sensor Mapping allows the controller to determine what operating gas sensors have been installed and, in the case of the carbon monoxide sensor, to determine whether an electrochemical or solid state
CO sensor is installed. The main purpose for this functional mode is to enable (i.e., turn on or map in) another sensor when a new one is added. It can also be used to disable (i.e., turn off or map out) a sensor that has been removed, to temporarily disable a failed sensor, and to re-enable a replacement sensor after a failed sensor was temporarily mapped out.
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Instruction Manual Environment Controller
Model 2450
To start
MAPPING
:
1. Press C key to initiate
COMFORT
.
2. Hold C key to initiate
CALIBRATE .
3. Hold C key again to initiate
MAPPING
.
In Sensor Mapping, the controller will check all four gas sensor inputs.
•
All installed and working sensors will be enabled.
•
All removed or failed sensors will be disabled.
•
Mapped date will be stored in controller memory.
Sensor Mapping runs for 10 seconds and then the controller automatically returns to
COMFORT
. During the 10second sensor mapping, the four Mode LEDs will be Off, and the Alarm Status LEDs corresponding to any enabled, working sensors will be On. None of the four function keys will operate in Sensor Mapping.
•
If the enabled sensor in the CO socket is a solid state type, the CO LED will blink rapidly during the 10second Sensor Mapping
•
If any new sensors are found and enabled during Sensor Mapping, a 5-minute warm up period for the new sensors will start after the Mapping function is completed. The corresponding Alarm Status LEDs for the new sensors on the front panel will blink (at 2 blinks per second) during this warm-up period.
Newly enabled sensors will use default calibration values stored in the controller until they are calibrated.
4.2.5. Other Operation
4.2.5.1. Warm-up
Warm-up is automatically started any time power is applied to the controller or when the controller is reset. Warm-up is a five-minute period that allows the gas sensors to stabilize.
After five minutes, the controller automatically returns to
NORMAL
.
To indicate that the warm-up is in progress the alarm indicator lights on the front panel will turn on and off in a vertical (walk) sequence. The walking sequence stops when the warm-up period is completed and the controller enters
NORMAL
.
Warm-up
P
Hold
Prior Mode
The warm up period can be stopped by pressing the
PURGE
key for five seconds, or until the
NORMAL
Mode LED turns on.
4.2.5.2. Door Open Switch Operation
The structure’s door open switch is an input to the Environment Controller. Transitions of the door switch are used, in conjunction with other inputs, to determine whether the structure is occupied or not. Opening the door causes the system to automatically select
COMFORT
and
PURGE
(see ¶4.2.1.2 and 4.2.1.3).
A structure will be considered occupied when the door has been opened or any Mode key has been pressed. A structure will be considered unoccupied if no function key is pressed for 6 minutes after the door has been closed.
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Instruction Manual Environment Controller
Model 2450
The Environment Controller starts a door closure sequence when the structure’s door is closed. During the first three minutes the buzzer will beep once every ten seconds. At the end of three minutes the main lights will turn off and the emergency light will turn on. The emergency light will remain on for another three minutes. This sequence will not start, however, if the controller is in Calibration, Sensor Mapping or Smoke Alarm. Also, if any key is pressed during the 6-minute door closure sequence, the structure will be considered occupied, and the sequence will be interrupted.
If door is closed during Calibration, the door close sequence will not start. If the calibration is successfully completed or is manually aborted, the structure is considered occupied. If calibration is timed out the system will start door close sequence.
4.2.5.3. Reset
When both RESET keys are pressed concurrently, and released, the controller will Reset and begin a warm-up cycle. Immediately after the Reset keys have been released all four Mode LEDs turn on for a two second period which allows for test modes to be initiated.
4.3. LED Indicators
A general description of the LED indicators is provided in 4.1.1 and in discussions of various operational modes. This section summarizes the indicators and their functions.
4.3.1. Mode Indicators
Table 4-2 summarizes operation of the LEDs during run mode.
Any Mode
* *
Reset
Warm-up
INDICATOR COLOR NORMAL COMFORT PURGE INHIBIT
NORMAL Green
COMFORT Amber
PURGE Red
INHIBIT Red
On*
Off
Off
Off
Off
On*
Off
Off
Off
Off
On*
Off
Off
Off
Off
On*
* When LED is on, it blinks slowly to provide positive indication that the processor is operating.
Table 4-2
Mode LED Indicators - Run Mode
Table 4-3 summarizes operation of the LEDs during special operational modes.
INDICATOR COLOR CALIBRATE MAP MANUAL TEST AUTO TEST
NORMAL Green Off Off
COMFORT Amber Flash* Off
PURGE Red Off Off
INHIBIT Red Off
* Flash rate is two times per second.
Off
Off
Off
Off
Flash
Cycle
Cycle
Cycle
Flash
Table 4-3
Mode LED Indicators - Special Modes
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Instruction Manual Environment Controller
Model 2450
4.3.2. Alarm Status Indicators
Table 4-4 summarizes the meaning of each Alarm Status LED during run mode and during special operation modes.
INDICATOR
Pump Run
High Water
High Humidity
High
Temperature
COLOR RUN MODE
Red Sump Pump over 3 minutes
Red
Red
Red
High Water Detected
High Humidity Alarm
High temperature Alarm
Vent Sail
Smoke
Red Air flow not detected
Red Smoke Alarm
Combustible
Carbon
Monoxide
Oxygen
Red Solid: Gas Alarm
Slow Blink: Sensor Fail
Red Solid: Gas Alarm
Slow Blink: Sensor Fail
Red Solid: Gas Alarm
Slow Blink: Sensor Fail
Hydrogen Sulfide Red Solid: Gas Alarm
Slow Blink: Sensor Fail
NORMAL Green Slow Blink:
Mode
NORMAL
COMFORT Amber Slow Blink:
Mode
COMFORT
PURGE Red Slow Blink:
PURGE
Mode
INHIBIT Red Slow Blink:
INHIBIT
Mode
Note: 1
Note: 2
CALIBRATE n/a n/a n/a n/a n/a n/a n/a n/a
Air Damper selected
Dehumidifier selected
Active 1 Active 2 Sump Pump selected
Active
Active
Active
Off
Blink
Off
Off
1
1
1
MAP TEST n/a A/C 1 selected n/a n/a n/a
Active
Active
Active
Off
Off
Off
Off
2
2
2
A/C 2 selected
Heater selected
Blower selected
Main Lights selected
Emergency Light selected
Green Indicator selected
Red Indicator selected
DC Fan selected
Auxiliary 1 selected
Auxiliary 2 selected
1. Off before applying calibration gas if a sensor is failed, disabled, or not installed.
2. On before applying calibration gas for installed, working sensors.
3. Blinking (2/second) while calibration gas is being applied for installed, working sensors.
4. Off after gas is removed for working sensors.
5. Blinking (rapidly)–for CO and H2S sensors only–before applying gas when there is background gas present.
1. Off if sensor is failed, disabled, or not installed.
2. On for 10 seconds for installed, working sensors.
3. Blinking (rapidly) for 10 seconds–for solid state CO sensor only–for installed, working sensor.
4. Blinking (2/second) for 5 minutes after Mapping for newly enabled sensors.
Table 4-4
Alarm Status Indicators
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Instruction Manual Environment Controller
Model 2450
4.3.3. Control Status Indicators
Table 4-5 summarizes the Control Status Indicators and their functions:
INDICATOR COLOR CONTROL FUNCTION
A/C 1
A/C 2
Heater
Amber On if internal temperature exceeds set point.
Lead/Lag logic determines which A/C is turned On first.
Off during smoke alarm or inhibit mode
Amber On if internal temperature exceeds set point.
Lead/Lag logic determines which A/C is turned On first.
Off during smoke alarm or inhibit mode
Amber On when temperature drops low minimum
NORMAL
or
COMFORT
set point.
Off during smoke alarm or inhibit mode
Blower
Air Damper
Amber On continuously if Dynamic Damper Control
Blower cycles On periodically when structure is occupied in Static Damper Control.
Blower also turns On when cooling mode conditions are met in Static Damper
Control.
Off during smoke alarm or inhibit mode
Amber Damper opens when cooling mode conditions are met and blower is on.
Off during smoke alarm or inhibit mode
Dehumidifier Amber Dehumidifier turns On when humidity exceeds set point (default 85% RH)
Special Case: If internal relative humidity sensor fails, the high humidity
LED on the front panel will be on 0.5 seconds in every 3 seconds. The high humidity alarm relay will be On. Dehumidifier will be Off
Sump Pump
Main Light
Amber Sump Pump is turned On when water level rises above the “Pump On” (high) level.
Sump Pump is turned Off when water level drops below the “Pump Off” (low) level.
Amber Main lights are On whenever the structure is occupied.
Main lights turn Off three minutes into the exit routine.
Emergency
Lights
Amber Emergency lights are On when the structure is occupied and there is no AC power.
Emergency lights are On for three minutes after the main lights turn Off during the exit routine.
Green Indicator Amber Green Indicator is On when the structure is safe to enter and the door is open or the structure is occupied.
Red Indicator Amber Red Indicator is On during entry procedure purge and at any time a gas or smoke
DC Fan alarm is On.
Amber DC Fan is turned On when AC power is lost or when any gas alarm occurs.
Auxiliary 1
Auxiliary 2
Amber
Amber
Audible Alarm n/a
Special functions for custom applications
Special functions for custom applications
Steady for 20 seconds when door is opened.
Steady during gas alarm
Pulsing if vent sail alarm occurs
Mixed steady 5 seconds, pulse 5 seconds if both gas alarm and vent sail alarm occur.
Pulse 10 seconds during first 3 minutes of exit routine
Press “I” to acknowledge audible alarm
Table 4-5
Control Status Indicators
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Instruction Manual Environment Controller
Model 2450
4.4. Vacuum Fluorescent Display (Option)
The optional two line, forty character vacuum fluorescent display can be factory installed on the front cover of the Environment Controller. The display functions are as follows:
•
During normal occupied operation the display indicates the internal temperature and relative humidity.
•
During the door close sequence, and for three minutes after the door close sequence has been completed the display reads “Press C turn on Lights”.
•
During unoccupied operation the display is turned off.
•
The display can be used to interrogate other status conditions by following the View Mode instructions in Sections 4.2.2.1 and 8.4.
4.5. Other Controller Operations
Various timers, alarm values and set points and special functions can be individually configured via the serial interface, using the set point menus. The factory default values of each set point are listed in the display of serial interface screens in Section 8.4.5 of this manual.
Page: 4-10
Instruction Manual Environment Controller
Model 2450
5. Calibration
5.1. Calibration Overview
Periodic calibration of the environment controller’s gas detection sensors is recommended to assure accurate and reliable operation. This procedure is a simple three step process:
•
Start calibration mode by using the push-buttons on the controller front panel (Gas Alarm LEDs on solid).
•
Apply calibration gases to the sensors for three minutes (Gas Alarm LEDs blinking).
•
Verify successful calibration by watching the LED’s on the front panel (Gas Alarm LEDs turn off).
Calibration gas is supplied in a single mixture containing all the necessary component gases in cylinders which fit the Sierra Monitor Model 1200-26 calibrator or the higher capacity Model 1250-00 calibrator.
5.2. Calibration Procedure
5.2.1. Calibration Keyboard Process
1.
PURGE
the structure for two minutes to insure that there is no background gas or alarm.
Run Mode
2. Press
COMFORT
key to insure the controller is in
COMFORT
Mode.
3. Press and hold the
COMFORT
key for 5 seconds until the Gas Alarm LEDs turn on. The controller turns on only the LEDs corresponding to mapped gas sensors.
C
Press
•
The
COMFORT LED will blink at 2 blinks per second to indicate that system is in the calibration mode.
COMFORT
C
Hold
•
Calibration cannot be started under the following circumstances:
System is in warm up mode.
Any sensor is in warm up mode.
All enabled sensors failed.
CALIBRATE
Any gas alarm is present.
•
During calibration mode, gas alarms are not active. Also, all other alarms, except smoke alarm, are active.
•
The LEDs of any disabled sensors or enabled but failed sensors will be off during calibration. After calibration is completed, the LEDs of any failed sensors will blink again.
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Instruction Manual Environment Controller
Model 2450
5.2.2. Calibration Sensor Process
1. Prepare the gas calibration equipment according to its instruction manual.
2. Open the slotted sensor cover located at the top of the controller by turning each of the captive screws a half turn counter clockwise and then lifting the cover to the vertical position. The gas sensor slots from left to right are: Combustible, Carbon Monoxide, Oxygen and
Hydrogen Sulfide. The fifth slot is the temperature and humidity sensor assembly which does not require periodic calibration.
Figure 5-1
Model 2450
Sensor Cover Open View
3. If a multi-port calibration adapter is used, place it over the group of sensors and allow the slotted cover to drop into position as a retainer. If a single cavity calibration adapter is used place it over each sensor in turn and repeat the following steps for each sensor.
4. Connect the gas delivery tube to the calibration adapter to begin the flow of gas.
5. Watch for each of the gas sensor LED s to change from solid to flashing. This signifies that the sensor is functioning properly.
6. Maintain the gas flow for three minutes, then discontinue the gas flow and remove the calibration adapter.
7. The sensor LEDs should turn off within 2 minutes as the sensor signals return to the zero level. Calibration is then complete and the slotted cover can be closed and secured.
5.2.3. Calibration Notes:
•
If any sensor does not flash during the calibration period, the sensor should be replaced and the new sensor must be calibrated.
•
If any key is pressed during calibration, the system will abort Calibration Mode and return to
COMFORT
Mode. The old calibration values will be used for the uncalibrated sensors.
•
If any sensor has received enough gas to calibrate before the calibration is aborted, the 5-minute warm-up
(recovery) period will start after calibration is aborted.
•
If CO or H
2
S electrochemical gas sensor senses more than 5 PPM of either CO or H
2
S gas at the beginning of calibration, its corresponding LED will blink very fast (about 7 Hz) to indicate the background gas is too high to calibrate. If clean air is used to purge the sensor and background gas cleared while system is still in the calibration mode, the LED will return to solid indicating that the sensor is ready to calibrate.
•
Calibration will be terminated if no sensor signal is higher than threshold within 15 minutes. This includes:
1) No sensor signal is higher than its threshold after calibration mode has run for 15 minutes,
2) One or more sensors’ calibration is complete and the other sensors do not sense gas for 15 minutes.
•
Gas alarms are not generated during gas sensor calibration.
•
If any alarm, except smoke alarm, occurs during gas sensor calibration, the alarm LED and alarm relay will be on, red indicator will be on, and calibration will continue. The alarm conditions include: pump run, high water, high humidity, high temperature, vent sail.
Page: 5-2
Instruction Manual Environment Controller
Model 2450
6. Maintenance & Service
6.1. General Requirements
The following are the manufacturer’s recommendations for periodic maintenance of the Model 2450
Environment Controller:
1 Calibration: Combustible, Carbon Monoxide, Oxygen and Hydrogen Sulfide, sensors require calibration every six months
2 Dust & Dirt Control: When calibration is performed the sensors should be checked visually to determine if dust or dirt build up needs to be removed. This cleaning should be done with dry instruments such as compressed air, cloth wipes or whisk broom.
6.2. Sensors
Sensor replacement is required at any time a sensor trouble is indicated by a flashing Gas Alarm Status LED beside the specific sensor. Replacement is also required if the sensor fails to calibrate correctly. To replace a sensor:
1. Open the sensor cover panel by loosening the wing screws on either side of the cover.
2. Lift the sensor out of the sockets by pulling it gently away from the PCB assembly.
3. Install a replacement sensor into the same socket.
4. Turn on the sensor using the sensor mapping function described in Section 4.2.4.2
5. Calibrate the sensor following the instructions in Section 05
6.3. Troubleshooting
Trouble shooting recommendations can be obtained by calling Sierra Monitor Corporation at 1 800 727 4377.
Sierra Monitor offers technical support including computer connection to the remote structure for trouble analysis.
6.4. Controller Removal
If it is necessary to replace the Model 2450 controller:
1. Make provision for temporary lighting in the structure before disabling the controller.
2. Remove power from the control panel.
3. Open the control panel door and remove three ribbon cables from the back of the controller.
4. Remove the ground tie from the back of the controller.
5. Remove four small nuts on the cabinet door and lift the controller off the front of the door.
6. Reverse the procedure to install replacement controller.
6.5. Interface Module Removal
If it is necessary to remove the Interface Module:
1. Make provision for temporary lighting in the structure before disabling the controller.
2. Remove power from the control panel.
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Instruction Manual Environment Controller
Model 2450
3. Open the control panel door and confirm that all wiring connections to the Interface Module are identified for re-installation.
4. Remove -48 VDC power by disconnecting at the Alarm Connection Module or at another safe location upstream from the Interface Module.
5. Remove all wiring from Interface Module terminals and move the wires clear of the PCB assembly.
6. Locate and remove four screws which hold the black Interface Module mounting plate to the control panel cabinet.
7. Lift the Interface Module out of the cabinet.
8. Reverse the procedure to install the replacement Interface Module.
Page: 6-2
Instruction Manual Environment Controller
Model 2450
7. Serial Interfaces
Model 2450 controllers are designed for convenient external interface via either direct or modem personal computer (PC) connection or via a hand held terminal. The controller automatically recognizes the method of communication at the time of any connection.
7.1. PC Connections
7.1.1. Modem
For remote connection via personal computer, a telephone line must be connected to the Model 2450 controller in the remote structure. The phone line can be permanently connected via the Model 2495 Alarm Connection
Module, or temporarily connected via the “Line” jack on the side of the controller.
To initiate the remote connection:
1. Connect a telephone line to the PC’s modem per the modem’s user manual.
2. Use a terminal emulation program (such as Windows - Terminal) and configure the following settings:
Baud Rate 2400, Data Bits: 8, Stop Bits: 1, Parity: None, Flow Control Xon/Xoff.
3. Select Terminal Emulation: VT-100.
4. Input the correct telephone number and dial the number.
5. When the two modems connect a message will be display on the terminal “Connect 2400”.
6. After a pause of up to 30 seconds, the controller main menu will be displayed.
7. Follow instructions in Section 8.4.2 to use the menu items.
8. To disconnect use the terminal program’s “Hang-Up” command.
7.1.2. Direct
To connect a laptop computer directly to the controller:
1. Connect a serial cable with a DB-9 male connector to the serial port on the side of the controller.
2. Connect the other end of the cable to a COM port on the computer. Generally computer’s COM-1 port requires a DB-9 female connector on the cable.
3. Open a terminal emulation program and enable COM-1.
4. The controller main menu will appear on the computer terminal screen.
5. Follow instructions in 8.4.2 to use the menu items.
6. To disconnect use the terminal program’s “Disconnect” command, or remove the serial cable from the controller.
7.2. Hand Held
A specially configured hand held terminal can be used to process inquiries by pressing labeled keys on the terminal. To connect the terminal to the controller:
1. Connect a serial cable with a DB-9 male connector to the serial port on the side of the controller.
2. Connect the other end of the cable to the hand held terminal.
3. The welcome menu will display on the terminal.
4. Follow instructions in Section 8.4.3 to use the menu items.
Page: 7-1
Instruction Manual Environment Controller
Model 2450
8. Appendices
8.1. Appendix A: Model 2450/2490/2495 Specifications
Power:
Microprocessor:
Modem:
Software:
Environmental:
Temperature
Humidity
Front Panel
Standard
Optional
Malfunction
Protection
Control Features
120V (50/60 Hz) as the primary and/or -48V (20-66 VDC) as the backup
5 Watts nominal
Motorola 68HCII with watchdog timer
Memory: 2.5 Kbytes EEPROM,
64K bytes EPROM, Real Time
Clock with 2 day backup by a supercapacitor
Clock Speed: 8 MHz
Hayes Compatible 2400 Baud
Supports any terminal communication program via modem or direct serial connection.
Over 60 programmable set points and two level access code.
Operating Range
4 o
to 122oF (-20 o
to 50 o
C )
Storage Range
-40 o
to 122 o
F (-40 o
to 50 o
C)
0 - 95% RH
Integral control panel with 6 keys and 28 LEDs. The 6 keys select the run mode: NORMAL ,
COMFORT , PURGE , INHIBIT and the reset function
Vacuum fluorescent alphanumeric display (2 rows x 20 characters)
Automatically turns on blower, air damper red indication and malfunction alarm if system malfunctions or power is lost.
Front panel selection of operating modes: Run, View, Test, Sensor
Maintenance. Hand Held
Terminal for viewing data or changing set points.
Sensors
Combustible Gas
Range
Sensor type
5,000 ppm (10% LEL)
Solid-state metal-oxide semiconductor
Sensor life
Set points
Over five years
Occupied 2,500 ppm
Unoccupied 5,000 ppm
Response
Carbon Monoxide
< 30 seconds to 90% FS
Range 100 ppm
Sensor type
Sensor life
Set points
Electrochemical
Over 3 years
Occupied 35 ppm
Response
Oxygen
Range
Sensor type
Sensor life
Set points
Response
Hydrogen Sulfide
< 30 seconds to 90% FS
Range 100 ppm
Sensor type
Sensor life
Set points
Electrochemical
Over 3 years
Occupied 10 ppm
Response
Temperature
Range
Sensor type
Sensor life
Accuracy
Humidity
Range
Sensor type
Sensor life
Accuracy
Unoccupied 100 ppm
< 30 seconds to 90% FS
25% by volume
Electrochemical
2 years
Occupied 19.5%
Unoccupied 16.5%
Unoccupied 20 ppm
< 30 seconds to 90% FS
0 o
to 221 o F (-15 o
to 105 o C)
Solid-state
Over ten years
± 1oF (0.5oC)
0-100% Relative Humidity (RH)
Solid-state
Over ten years
± 5% Relative Humidity
Page: 8-1
Instruction Manual
Digital
Analog
Inputs
Integral
External
Outputs
Alarms
(Model 2450)
Temperature
Humidity
Combustible Gas
Carbon Monoxide
Oxygen
Hydrogen Sulfide
(Terminals on the Model 2490, controls in 2450.)
Intrusion
Door Open
AC Failure
Smoke Alarm
Duct Sail Switch
High Water Alarm
Pump On Level Switch
Pump Off Level Switch
Spares (Qty 9)
Total Digital Points: 17
(Optional sensors available)
External Temperature
Internal Temperature #1
Internal Temperature #2
External Relative Humidity
0-10 VDC Spare
4-20 mA Spare (Optional)
Total Analog Points: 6
(Alarm outputs are controlled by Model
2450, relays are located on Model 2495.)
SPST (Form A), 0.5 Amp, 60 VDC or
30 VRMS(AC), Rated for 20 Million operations at 10V, 4mA load
Pump Run
High Water
High Humidity
High Temperature
Vent Sail
Smoke
Combustible Gas
Carbon Monoxide
Oxygen
Hydrogen Sulfide
AC Power Fail
Intrusion
Malfunction
Gas Detection Trouble
Common Motor Current Alarm
Spare (2)
Total Alarm Points: 17
Environment Controller
Model 2450
Controls Control outputs are controlled by Model
2450, the relays are also located on the
Model 2450. Connection terminals are on the Model 2490
SPST (Form A), 0.5 Amp, 60 VDC or
30 VRMS(AC), Normally open contacts.
One end of all contacts connected to common 24 VAC. Rated for 20 Million operations at 10V, 4mA load
Air Conditioner #1
Air Conditioner #2
Heater
Blower
Air Damper
Dehumidifier
Sump Pump
Main Lights
Emergency Light
Green Indicator
Red Indicator
DC Fan (48V)
Spares (Qty 2)
Additional Dry Contacts:
Analog Output
Air Conditioner #1
Heater
Total Control Points: 14
One available, 4-20 mA, or 0-20 mA, or 0-10V, Loop resistance
400 ohm
Audible Output Buzzer, variable alarm tone
Auxiliary Power
Output
+12 VDC output for remote smoke detector.
Page: 8-2
Instruction Manual
Mechanical
Model 2450
Enclosure
Mounting
Connections
Dimensions
Weight
Model 2490
Enclosure
Connections
Mounting
Dimensions
Weight
Model 2495
Enclosure
Mounting
Connections
Dimensions
Weight
NEMA-1 with hinged sensor cover panel
Installs on door of electrical wiring enclosure
3 each 37 pin “D” connectors
11.25 x 8.75 x 2.0 inches
(WxHxD) ( 28.6 x 22.2 x 5.1 cm)
3.2 lbs (2.3 Kg)
Enclosure by user
2 each 37 pin “D” connectors
Screws terminals for sensor inputs and controls
Supplied on mounting plate
13.0 x 9.0 inches (WxH) (33.0 x
22.9 cm)
4.2 lbs (1.9 Kg)
NEMA 1
Internal Mounting holes for panel assembly
1 each 37 pin “D” connector
Screw terminals for alarms, 48
VDC supply and phone line
8.0 x 8.0 x 2.0 inches (WxHxD)
(20.5 x 20.5 x 5.0 cm)
1.4 lbs (0.63 kg)
Environment Controller
Model 2450
Page: 8-3
Instruction Manual Environment Controller
Model 2450
8.2. Appendix B: Limited Warranty
SIERRA MONITOR CORPORATION warrants its environment controller products to be free from defects in workmanship or material under normal use and service for two years after date of shipment. SMC will repair or replace, without charge, any equipment found to be defective during the warranty period. Final determination of the nature and responsibility for defective or damaged equipment will be made by SMC personnel.
All warranties thereunder are contingent upon proper use in the application for which the product was intended and do not cover products which have been modified or repaired without SMC approval or which have been subjected to accident, improper maintenance, installation or application, or on which original identification marks have been removed or altered. This Limited Warranty also will not apply to interconnecting cables or wires, consumables (i.e. calibration gases, batteries), nor to any damage resulting from battery leakage.
In all cases SMC's responsibility and liability under this warranty shall be limited to the cost of the equipment.
The purchaser must obtain shipping instructions for the prepaid return of any item under this warranty provision and compliance with such instruction shall be a condition of this warranty.
Except for the express warranty stated above, SMC disclaims all warranties with regard to the products sold hereunder including all implied warranties of merchantability and fitness and the express warranties stated herein are in lieu of all obligations or liabilities on the part of SMC for damages including but not limited to consequential damages arising out of/or in connection with the use or performance of the product.
Page: 8-4
Instruction Manual Environment Controller
8.3. Appendix C. Product Numbering
8.3.1. Model Numbers
Table 8-1 lists the model numbers for the major components of the Environmental Control system:
Model 2450
MODEL NUMBER
2450-20
2450-21
2450-22
2450-23
2450-24
2450-40
2450-41
2450-42
2450-43
2450-44
2490-20
2495-10
DESCRIPTION
Environment Controller with software license for CEV, CEC and
Hut, with no gas sensors.
Same as 2450-20, with combustible gas sensor
Same as 2450-21 with carbon monoxide sensor
Same as 2450-22 with oxygen sensor
Same as 2450-23 with hydrogen sulfide sensor
Same as 2450-20 with vacuum fluorescent display option
Same as 2450-21 with vacuum fluorescent display option
Same as 2450-22 with vacuum fluorescent display option
Same as 2450-23 with vacuum fluorescent display option
Same as 2450-24 with vacuum fluorescent display option
Interface Module with 110 VAC and -48 VDC power supplies
Alarm Connection Module
Table 8-1
Major Component Model Numbers
8.3.2. Options
Table 8-2 lists model numbers for Environment Controller options.
MODEL NUMBER
1200-26
1290-03
1290-08
1250-02
1260-50
1260-51
2401-50
2404-50
2480-00
SPK22087
DESCRIPTION
Calibration Kit
Cylinder, calibration gas, methane 5,000 ppm
Cylinder, calibration gas carbon monoxide 25 ppm
Calibration Kit, multi gas, high capacity
Cylinder, calibration gas mixture methane 5,000 ppm, carbon monoxide 25 ppm
Cylinder, calibration gas mixture, four gases.
Remote Indicator Box
Smoke Detector - 12 VDC
Hand Held Terminal w/ Cable
Temperature Sensor, External (15’ cable)
Table 8-2
Optional Item Model Numbers
Page: 8-5
Instruction Manual
8.3.3. Spare Parts
Table 8-3 lists spare and replacement parts available from Sierra Monitor Corporation.
Environment Controller
Model 2450
MODEL NUMBER
SPK33003
SPK33030
SPK33044
SPK33041
SPK22031
SPK22082
SPK22084
SPK25011
DESCRIPTION
Sensor, Combustible Gas
Sensor, Carbon Monoxide
Sensor, Oxygen
Sensor, Hydrogen Sulfide
Sensor Assembly, Temperature, Humidity
Cable, Ribbon 37 lead, Alarm Connector
Cable, Ribbon 37 lead, Interface Connector
Cable, Serial DB9, for Hand Held Terminal
Table 8-3
Spare Part Model Numbers
Page: 8-6
Instruction Manual Environment Controller
Model 2450
8.4. Appendix E - Data Interface Screens
8.4.1. Description
Status conditions, data logs and set points can be viewed via computer terminal, hand held terminal or the optional vacuum fluorescent digital display on the controller. Set points can be changed via computer terminal or hand held terminal.
A similar menu/data structure is used for each of the methods of communication. The data structure is described in 8.4.2, Computer Terminal Instructions.
8.4.2. Computer Terminal Instructions
Instructions for making initial connection via computer are provided in Section 7.1.1 (modem) and 7.1.2 (direct). Once a connection is made, the controller sends a menu to the computer.
The menu screen is the first example shown in Section 8.4.5, below. See also, Figure 8.1.
Note that:
•
The header of the menu screen lists the controller tag number (or location), the controller software version number, and the current date and time at the controller location.
I
J
K
L
M
N
E
F
G
H
A
B
C
D
STATUS
STATUS
STATUS
STATUS
LOG
LOG
WELCOME TERMINAL OPERATOR
CEV 123 MAIN, NOTOWN, SC
CONTROL #: 2450-CC-VR
TIME: 01/01/96 12:00
MAIN MENU
- ALARMS
- CONTROLS
LOG
SET POINTS
SET POINTS
SET POINTS
SET POINTS
SET POINTS
- INPUTS
- POWER SUPPLY & GAS
- ENVIRONMENTAL
- ALARMS
- RUN TIMES
- TIMERS
- TEMPERATURE & HUMIDITY
- VENTILATION
MOTOR CURRENT TEST
SECURITY
- GAS MONITOR
- CONFIGURATION
•
Each line of the menu is prefixed by an alpha symbol (A through N).
Figure 8-1
Computer Terminal Main Menu
•
The lines are “grouped” by Status, Log and Set Point. The terminology for Hand Held Terminal and VFD Display refers to these “Groups”.
•
Within each Group there are several “Families”. For example The Status Group has Alarm, Control and
Input Families.
To display the “Line Item” data for any family press the corresponding alpha key on the computer keyboard.
Each of the line item displays are reproduced in Section 8.4.5, below.
To return to the main menu at any time, press the space bar, or escape key. To change line item displays without returning to the main menu, press the new alpha key.
Although Set Points can be viewed by any user, they are protected from change unless the user is authorized via a security code. Security codes for set point changes are described below.
8.4.2.1. Security PIN Codes
1. There are two levels of security. The level one master code allows level two PIN codes to be established. Each PIN code is a four digit number.
N) SECURITY
1 Change Master PIN
2 Change Operator PIN
2. To establish user codes on a new controller, Press “N”. The controller will prompt “1” to Change Master
PIN, 2 to Change Operator PIN. Select “1” and follow the prompts to input a four digit Master PIN
3. To establish an operator PIN, Press “N” and input the Master PIN. ”. The controller will prompt “1” to
Change Master PIN, 2 to Change Operator PIN. Select “2” and follow the prompts to input a four digit
Operator PIN
Page: 8-7
Instruction Manual Environment Controller
Model 2450
4. After PIN numbers have been established, either the Master or the Operator PIN can be used to authorized set point changes.
8.4.2.2. Set Point Changes
Set point changes can only be made when a Master or Operator PIN number authorization has been input.
When set point changes are authorized, each of the Set Point Group data screen will display with line numbers for each data line.
To make set point changes:
1. Input PIN code.
2. Press the alpha key corresponding to the required set point family.
3. Input the number of the set point to be changed, press Enter.
4. The terminal will display the current value and prompt for the new value.
5. Input the new value, press Enter.
6. The terminal will display the new value and ask for a Yes/No validation.
7. Press the Y key to validate, N key to reject the new value.
8. The terminal will return to the set point family display screen with the new value.
8.4.3. Hand Held Terminal Instructions
Instructions for connection of the Hand Held Terminal (HHT) are provided in Section
7.2.
When the HHT is properly connected, it will display the same data as the header of the computer terminal main menu. To access data displays:
1. Press the labeled “Group” key. The display will indicate the alpha number of the first family in the group, and the corresponding Group indicator LED on the HHT will light.
2. Use the left and right arrow keys on the HHT to move between families within groups.
3. Use the up and down arrows on the HHT to move between data lines within a family.
Figure 8-2
Computer Terminal Display
Hand Held Terminal
4. To change set points press the Set Point key, followed by the right arrow until the “N” menu is displayed.
Then follow the same instructions as 8.4.2.2.
Page: 8-8
Instruction Manual Environment Controller
Model 2450
8.4.4. View Mode Instructions
All data lines can be viewed on the Vacuum Fluorescent Display (VFD) by using
View Mode. Instructions for entering View Mode are provided in 4.2.2.1. View operation is similar to HHT operation except that there is no access for set point changes.
1. To advance between groups (Status, Log, Set Points) press On
2. Within groups, to advance between families (e.g. Inputs, Controls etc.) press
Off
3. Within a Family to move between data lines press Up, D OWN
.
Figure 8-3
VFD Display on Controller
Page: 8-9
Instruction Manual
8.4.5. Computer Screens
WELCOME TERMINAL OPERATOR
-----------CEV 123 MAIN, NOTOWN, SC ------------
CONTROL #: 2450-CC-VR
TIME: 01/01/96 12:00
MAIN MENU
A STATUS
B STATUS
C STATUS
D STATUS
E LOG
F LOG
G LOG
- ALARMS
- CONTROLS
- INPUTS
- POWER SUPPLY & GAS
- ENVIRONMENTAL
- ALARMS
- RUN TIMES
H SET POINTS - TIMERS
I SET POINTS - TEMPERATURE & HUMIDITY
J SET POINTS
K SET POINTS
- VENTILATION
- GAS MONITOR
L SET POINTS
M MOTOR CURRENT TEST
- CONFIGURATION
N SECURITY
A STATUS - ALARMS
Pump Run
High Water
High Humidity
High Temperature
Vent Sail
Smoke
Combustible Gas
Carbon Monoxide
Oxygen
Hydrogen Sulfide
Intrusion
AC Power Fail
Gas Detection Trouble
Motor Current Alarm
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
B STATUS
A/C 1
A/C 2
Heater
Blower
Air Damper
Dehumidifier
Sump Pump
Main Lights
Emergency Light
Green Indicator
Red Indicator
DC Fan (48V)
- CONTROLS
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
Environment Controller
Model 2450
C STATUS
Internal Temperature
Relative Humidity
External Temperature
Smoke Alarm
Intrusion Switch
Door Open
Duct Sail Switch
High Water
Pump On Level Switch
Pump Off Level Switch
AC Failure
A/C Compressor 1
A/C Compressor 2
A/C Condenser Fan
Pump Over Run
Blower Motor
- INPUTS
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
75 o
F
50 %
85 o
F
OFF
OFF
OFF
OFF
D STATUS
AC to 5.5 VDC
48 VDC to 5.3 VDC
+12 VDC
Combustible Gas
Carbon Monoxide
Oxygen
Hydrogen Sulfide
POWER SUPPLIES & GAS
5.5 VDC
5.3 VDC
12.0 VDC
% FS
00 PPM
20.9 %
00 PPM
E LOG - ENVIRONMENTAL
Log Reset Date/Time 12/31/95 09:00
Highest Internal Temperature 95 o
F 3/15/96 16:15
Lowest Internal Temperature 65 o
F 1/05/96 01:25
Highest External Temperature 95 o
F 3/15/96 16:15
Lowest External Temperature 65 o
F 1/05/96 01:25
Highest Relative Humidity 92% 3/15/96 10:35
Lowest Relative Humidity 40% 3/15/96 10:35
F LOG
00 - 08/13 10:57
01 - 08/13 9:12
02 - 08/13 9:11
03 - 08/13 8:17
04 - 08/01 11:13
G LOG
Run Times Reset Date/Time
Run Time A/C 1 (hh:mm)
Run Time A/C 2
Run Time Heater
Run Time Blower
Run Time DC Fan
Run Time Sump Pump
Run Time Dehumidifier
Run Time Main Light
Run Time Emergency Light
- ALARMS
System reset= On
Vent sail alarm= Off
Vent sail alarm= On
System reset= On
Vent sail alarm=Off
- RUN TIMES
12/31/95 10:00
145:20
144:55
14:25
2,127:15
0:19
1:03
12:10
4:18
00:24
Page: 8-10
Instruction Manual
H SET POINT
1 Sensor Warm-up Time
2 Comfort Mode Span
3 Purge Mode Span
4 Inhibit Mode Span
5 Test Mode Span
6 Auto Test Step Time
7 Door Close Main Lights On
8 Emergency Light On
9 Pump Run Alarm Delay
10 High Water Alarm Delay
11 Inhibit Horn Span
12 Vent Sail Alarm Delay
13 Gas Alarm Blower Off Delay
- TIMERS
5 mins
120 mins
60 mins
30 mins
120 Mins
10 secs
180 secs
180 secs
180 secs
10 secs
5 mins
10 secs
30 Secs
I SET POINT- TEMPERATURE & HUMIDITY
1 A/C 1 On Delay
2 A/C 2 On Delay
3 A/C Lead/Lag Temperature Differential
4 A/C NORMAL Temperature Set Point
120 secs
180 secs
2 ºF
95 ºF
5 A/C COMFORT Temperature Set Point
6 Heater NORMAL Temperature Set Point
72 ºF
60 ºF
7 Heater
COMFORT
Temperature Set Point 63 ºF
8 High Temperature Alarm Set Point 125 ºF
9 High Temperature Full Vent Set Point
10 Temperature Set Point Differential
11 Dehumidifier On Set Point
12 Dehumidifier Off Set Point
13 High Humidity Alarm Set Point
120 ºF
5 ºF
55 %RH
50 %RH
85 %RH
J SET POINT - VENTILATION
Air Damper Control Method
Static Control Method
Cooling Mode Criteria
1
2
3
Internal Temperature (above)
External Temperature (below)
Internal Humidity (below)
Static
85 o
F
80 o
F
75%
Occupied Ventilation
4 Cycle Time 15 mins
5 Blower/Damper Run Time/Cycle 60 secs
Dynamic Control Method
6 Internal Temperature Minimum
7 External Temperature Minimum
8
9
Internal Humidity Maximum
Temperature Differential
10 Damper Position Update Rate
68
40 o o
F
F
75%
5 o
F
10 secs
Environment Controller
Model 2450
K SET POINT - GAS MONITOR
1 Combustible Enabled
2 Calibration Concentration
3 Vent Control Set Point
4 Alarm Set Point
5 Carbon Monoxide (CO) Enabled
6 Calibration Concentration
7 Vent Control Set Point
8 Alarm Set Point
9 Oxygen Enabled
10 Calibration Concentration
11 Vent Control Set Point
12 Alarm Set Point
13 Hydrogen Sulfide (H
2
S) Enabled
14 Calibration Concentration
15 Vent Control Set Point
16 Alarm Set Point
Yes
5,000 PPM
2,500 PPM
5,000 PPM
Yes
35 PPM
35 PPM
100 PPM
No
18.0 %
19.5 %
16.5 %
No
10 PPM
10 PPM
20 PPM
L SET POINT - CONFIGURATION
1 Forced Input Enabled
2 Auto Comfort Mode
3 Red/Green Status Light Always On
4 Suppress Low CO Logic
5 A/C 2 Enabled
6 DC Fan Enabled
7 A/C Compressor 1 Monitor Enabled
8 A/C Compressor 2 Monitor Enabled
9 A/C Condenser Fan Motor Enabled
10 Sump Pump Over Run Monitor Enabled
No
No
11 Blower Motor Monitor Enabled
12 Location
No
Sierra Monitor Factory
13 Time
14 Date
17:01
08/21
15 Calibrate Temperature Sensor
16 Calibrate Relative Humidity Sensor
1/1/96
1/1/96
No
Yes
Yes
No
Yes
Yes
No
No
M MOTOR CURRENT TEST
1 A/C 1 Test
2 A/C 2 Test
3 Sump Pump Test
4 Blower Motor Test
5 Auto Test
N SECURITY
Enter PIN Number
Passed
Passed
Passed
Passed
Passed
####
Page: 8-11
Instruction Manual Environment Controller
Model 2450
LIST OF FIGURES
F IGURE 1-1 M ODEL 2450 E NVIRONMENT C ONTROLLER ........................................................................................................... 1-1
F IGURE 1-2 E NVIRONMENT C ONTROLLER I NTERFACE B LOCK D IAGRAM .................................................................................. 1-2
F IGURE 1-3 M ODEL 2450 O UTLINE D IMENSIONS ...................................................................................................................... 1-3
F IGURE 1-4 M ODEL 2490-00- I NTERFACE M ODULE .................................................................................................................. 1-4
F IGURE 1-5 M ODEL 2490 -M ECHANICAL D ETAIL ..................................................................................................................... 1-4
F IGURE 1-6 M ODEL 2495 - M ECHANICAL D ETAILS ................................................................................................................... 1-5
F IGURE 3-1 M OUNTING D ETAILS .............................................................................................................................................. 3-1
F IGURE 3-2 R IBBON C ABLE C ONNECTORS R EAR V IEW OF M ODEL 2495 .................................................................................. 3-2
F IGURE 3-3 W IRING C ONNECTIONS - C ONTROLS ...................................................................................................................... 3-4
F IGURE 3-4 W IRING C ONNECTIONS - D IGITAL I NPUTS .............................................................................................................. 3-5
F IGURE 3-5 W IRING C ONNECTIONS - A NALOG I/O.................................................................................................................... 3-6
F IGURE 3-6 W IRING C ONNECTIONS - A LARM C ONNECTION M ODULE ....................................................................................... 3-7
F IGURE 4-1 M ODEL 2450 C ONTROL K EYS ................................................................................................................................ 4-1
F IGURE 5-1 M ODEL 2450 S ENSOR C OVER O PEN V IEW .............................................................................................................. 5-2
F IGURE 8-1 C OMPUTER T ERMINAL M AIN M ENU ...................................................................................................................... 8-7
F IGURE 8-2 C OMPUTER T ERMINAL D ISPLAY H AND H ELD T ERMINAL ....................................................................................... 8-8
F IGURE 8-3 VFD D ISPLAY ON C ONTROLLER ............................................................................................................................ 8-9
List of Figures
Instruction Manual Environment Controller
Model 2450
LIST OF TABLES
T ABLE 4-1 M ODES AND C ONTROL K EYS ...................................................................................................................................4-2
T ABLE 4-2 M ODE LED I NDICATORS - R UN M ODES ...................................................................................................................4-7
T ABLE 4-3 M ODE LED I NDICATORS - S PECIAL M ODES .............................................................................................................4-7
T ABLE 4-4 A LARM S TATUS I NDICATORS ...................................................................................................................................4-8
T ABLE 4-5 C ONTROL S TATUS I NDICATORS ................................................................................................................................4-9
T ABLE 8-1 M AJOR C OMPONENT M ODEL N UMBERS ..................................................................................................................8-5
T ABLE 8-2 O PTIONAL I TEM M ODEL N UMBERS ..........................................................................................................................8-5
T ABLE 8-3 S PARE P ART M ODEL N UMBERS ...............................................................................................................................8-6
List of Tables

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Key features
- Monitors a wide range of environmental parameters including temperature, humidity, airflow, smoke, and water leaks.
- Provides real-time data logging and analysis for comprehensive environmental monitoring.
- Controls HVAC systems, fans, and other devices to maintain desired environmental conditions.
- Offers remote access and control via computer interface for convenient monitoring and management.
- Supports multiple alarm levels and notification methods for timely alerts in critical situations.
- Complies with industry standards and UL Recognized for reliability and safety.