DriSteem Vapor-logic3 Instructions d'exploitation télécharger pdf (Page 47)

Aquastat operation

The aquastat set point is the minimum tank

temperature the VAPOR-LOGIC

controller should

maintain. It is adjusted through the Set Up screen.

This feature is typically used to keep the tank from

freezing in a cold environment. However, it can also

be used to hold a higher minimum temperature if a

quick response to a demand signal is needed. For

example, if the aquastat is set at 180°F (82°C), when

a call for humidity occurs, the tank will only need to

warm up 32°F (18°C) to reach the boiling point and

start producing steam. However, if the aquastat is at

its minimum setting of 40°F (4°C) and the tank is in

an average-temperature occupied room, the tank will

be sitting at about 70°F (21°C). Now, when a call for

humidity occurs, the tank will need to warm up

142°F (79°C) to reach the boiling point and begin

producing steam. This feature is standard on all

DRI-STEEM humidifiers with VAPOR-LOGIC

control except ULTRA-FOG

and Steam Injection

humidifiers.

Tank heat-up feature

The tank heat-up feature uses the tank temperature

sensor to quickly heat a tank in response to a demand

signal. Its operation is as follows: If the tank is cold

(70°F) and a small demand signal is delivered, the

VAPOR-LOGIC

controller will override the

demand signal and run the humidifier at 100%

demand until the tank temperature is 190°F (88°C). At

this point, control will be returned to the original

demand signal and the humidifier will begin normal

operation. This allows the system to respond quickly

to even the smallest demand. This feature is standard

on all DRI-STEEM humidifiers with

VAPOR-LOGIC

control except ULTRA-FOG and

Steam Injection humidifiers.

SDU timer

If your humidifier is equipped with a Space

Distribution Unit (SDU) or an Area-Type fan, you

have the option of controlling how long the fan will

run after a call for humidity has ended. This delay

(SDU Duration) is adjustable in one-minute intervals

through the Set Up screen.

Sensor offsets

All external transmitters shipped with

VAPOR-LOGIC

can be field calibrated using the

keypad/display through the Set Up screen. For

example, if the system is equipped with an RH

transmitter, there will be an RH offset setting. The

factory default for all transmitter settings is zero.

However, if an adjustment is necessary, the keypad

can be used to adjust the transmitter reading up or

down through this setting. The sensors that have this

adjustment capability are the humidity, VAV high

limit, temp comp and dew point transmitters.

Metric conversion

VAPOR-LOGIC

is capable of displaying all

information in metric as well as standard units.

Aquastat, heat-up, SDU, offsets, metric.

Operation

Operation:

Aquastat, heat-up, SDU, offsets, metric

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 74 75

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DriSteem Vapor-logic3 Instructions d'exploitation Page 47

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