DriSteem HUMIDI-TECH DI Guide d'installation Page 10
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3
Installation and Operation Manual
SSR modulation
DRI-STEEM electric humidifiers are available with two basic
types of solid state relay (SSR) modulation: SSR modulation with
contactors and 100% SSR modulation.
SSR modulation with contactor sequence
On systems that employ SSR modulation with contactors, the
operation of the unit is the same as with TP modulation. In this
scenario, one of the cycling contactors is replaced with an SSR. The
SSR now is the device that carries out all of the cycling duties. The
contactors are always either on or off. Any needed TP cycling is
handled by the SSR stage.
This provides two distinct advantages over standard TP modulation.
First, an SSR can turn on and off much faster than a contactor can.
Therefore, as the unit modulates around a demand signal, tighter
control is achieved because the cycle time on an SSR system can be
as low as one second (factory set at two seconds). This means that
every two seconds, the controller can adjust the on and off times of
the SSR to closely track desired demand.
The second major advantage over standard TP modulation is
reliability. With a solid state device like an SSR, component wear
is almost nonexistent compared with an electromechanical device
such as a contactor. Therefore, with the SSR doing all of the heavy
cycling work, the life expectancy of the contactors is extended.
100% SSR modulation
The ultimate in electric humidifier modulation is 100% SSR
modulation. With this type of control, all heat stages are controlled
by SSRs. This allows the output of the humidifier to track the actual
demand closely because all heat stages now can cycle on and off at
the rapid SSR cycle rate.
With 100% SSR modulation, a contactor is wired in series with
the SSR devices as an additional safety feature. If an SSR fails, the
controller will de-energize the contactor, which will de-energize the
heaters.
VL3_IOM.pdf 10 11/19/2009 9:11:05 AM
- Vapor-logic 1
- Table of contents 3
- 1SPEVDUPWFSWJFX 5
- Summary of features 6
- Control input signals 7
- board receives a linear 8
- 51NPEVMBUJPO 9
- SSR modulation 10
- 7BMWFBOECVSOFSNPEVMBUJPO 11
- XBUFSNPEFMT 12
- *OTUBMMJOHUIFLFZQBEEJTQMBZ 14
- Figure 11-1: 15
- Figure 13-1: 17
- controller. The 18
- Figure 15-1: 19
- GTS expansion board 19
- 3 main controller 20
- main controller 21
- Installation checklist 22
- Typical installation 23
- (FOFSBMXJSJOHQSPDFEVSFT 24
- (FOFSBMXJSJOHQSPDFEVSFT 25
- Control cabinet connections 26
- 4FOTPSEFWJDFQMBDFNFOUBOE 29
- IVNJEJUZDPOUSPMPWFSWJFX 29
- 8JSJOHTFOTPSEFWJDFT 30
- Installation: Wiring detail 31
- Figure 28-1: 32
- VAV transmitter wiring 32
- Figure 29-1: 33
- Figure 30-1: 34
- Figure 31-1: 35
- YYPOMZ 36
- Important: 37
- Connecting LonTalk 39
- Connecting LonTalk, continued 40
- -PO5BML/FUXPSLWBSJBCMFBOE 42
- Table 39-1: 43
- OWPDPOUJOVFE 44
- OWP%JHJUBM@*0 45
- Introduction 46
- Multiple tank configurations: 47
- 1SJPSJUZHSPVQT 47
- Installation 49
- Multi-tank status screen 50
- 6TJOHUIFLFZQBEEJTQMBZ 51
- Configuring humidifier tanks 52
- Using the keypad 56
- Using the keypad, continued 57
- .FOVTUSVDUVSFPWFSWJFX 58
- Main menu: Idle screen 60
- Idle screen status messages 61
- Main menu: Status screen 62
- Main menu: Alarms screen 64
- Fault messages 65
- Fault messages, continued 66
- Table 63-1: 67
- Set Up menu information 67
- Main menu: Set Up screen 68
- Adjusting set point 69
- 1*%UVOJOH 70
- 1*%UVOJOHDPOUJOVFE 71
- controller. Users 75
- can be field 77
- Table 74-1: 78
- Main menu: Diagnostics screen 82
- Main menu: Reports screen 83
- Start-up checklist 85
- Start-up checklist, continued 86
- Troubleshooting introduction 88
- Troubleshooting guide 100
- Replacement parts 105
- DRI-STEEM Vapor-logic 107
- Two-year Limited Warranty 108
- Extended warranty 108
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