Carel heaterSteam Specifications download pdf (Page 16)

CAREL heaterSteam

1.6.4 Control Wiring for On/Off Operation

This control program is for On/Off operation in response to an

external closed contact as from a humidistat or DDC relay.

Parameter A0=0

If the Hi-Limit and Airflow switches are not used, then place a

jumper across terminals 7I and 8I. WARNING: connect an

external dry contact to terminals 7I and 8I. Do not apply

any voltage to these terminals. Max. 50 ohm resistance.

DO NOT apply voltage to any input in On/Off control.

1.6.5 Control Wiring for Modulation to External

Signal

This control program is designed to accept various modulating

input signals: 0-10 Vdc, 2-10 Vdc, 0-20 mAdc, and 4-20 mAdc.

Parameter A0=1.

If the Hi-Limit and Airflow switches are not used, then place a

jumper across terminals 7I and 8I. WARNING: connect an

external dry contact to terminals 7I and 8I. Do not apply

any voltage to these terminals. Max. 50 ohm resistance.

NOTE: The modulating signal must come from a controller or

DDC system, not a sensor. This control program follows the

input signal, being off at low signal and full on at high signal.

1.6.6 Control Wiring for Stand-Alone Modulation with Humidity Display

This control program is designed to accept an input signal

from a humidity sensor (not controller). Parameter A0=2. This

input signal is then displayed on the controller as the relative

humidity. Set point and differential are entered into the

controller, making it stand-alone. To the right is the wiring for

the ASWH10000 wall mount sensor and the ASDH10000 duct

mount sensor.

This control program can also accept a second sensor (in this

example shown as an ASDH10000 duct sensor), which acts

as a high limit and will modulate the output down on

approaching either the main set point or the high limit set

point. Parameter A0=3. This is a very useful feature in VAV

systems where the air flow can vary, and also in high precision

applications where the on/off cycling of a high limit humidistat

would be detrimental to precision.

If the Hi-Limit and Airflow switches are not used, then place a

jumper across terminals 7I and 8I. WARNING: connect an

external dry contact to terminals 7I and 8I. Do not apply

any voltage to these terminals. Max. 50 ohm resistance.

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Carel heaterSteam Specifications Page 16