Veris Industries VH7200 SERIES Install - Manual (Page 13)

13
If the “Hum” LED is ON and you measure a dc voltage
close to 10 Vdc, the humidistat is working fine. Look at
the wiring between the Humidistat and the Humidifier. If
the Humidistat is not powered by the Humidifier
(separate transformer) you may have a conflict with the
Common (signal reference) On a VH7270F1000,
disconnect the wire on the
“Hum” terminal measure the
voltage across terminals
“Hum” and “C” you should
read a dc voltage close to 10
Volts
If the “Hum” LED is ON and you don’t measure a dc
voltage, the humidistat is probably defective, contact
your distributor or Viconics technical support
department.
If the “Hum” LED is ON and you measure 24 Vac, the
humidistat is working fine. Look at the wiring between
the Humidistat and the Humidifier. If the Humidistat is
not powered by the Humidifier (separate transformer)
you may have a conflict with the Common (signal
reference)
Humidistat calls for
humidification.
(Hum LED is ON)
but the humidifier
does not operate
On a VH7200A1000,
disconnect the wire on the
“Hum” terminal measure the
voltage across terminals
“Hum” and “C” you should
read 24 Vac.
If the “Hum” LED is ON and you don’t measure 24 Vac,
the humidistat is probably defective, contact your
distributor or Viconics technical support department.
RH sensor is out of range Verify the remote humidity sensor and it’s wiring or the
internal RH sensor
System Mode in Humidification
or Off Change the system mode parameter to Dehumidification
System Mode in Auto but there
is a Humidification demand at
the humidistat Wait: when a Dehumidification demand will occur at the
humidistat, dehumidification will resume.
Humidistat does
not call for
dehumidification
(Dehum LED is
OFF)
Outside air humidity is below
the Dhu OALK parameter Change the Dhu OALK parameter to a value that will
enable the dehumidification, if desired.
When you short across the two “DEH” terminals the unit
does not operate, the problem is related to wiring or to
the dehumidification device. Refer to wiring diagram.
Humidistat calls for
dehumidification
(Dehum LED is
ON) but the
dehumidifier does
not operate On all models, take a wire
(jumper) and short across
“DEH” and “DEH” terminals.
If the system turns ON when you short across the two
“DEH” terminals the humidistat dehumidification contact
is probably defective, replace humidistat.
Specifications
Humidistat power requirements: 19-30 Vac 50 or 60 Hz; 2 VA ( RC & C ) Class 2
Operating conditions: 0 °C to 50 °C ( 32 °F to 122 °F )
0% to 95% R.H. non-condensing
Storage conditions: -30 °C to 50 °C ( -22 °F to 122 °F )
0% to 95% R.H. non-condensing
Resolution: Temperature: ± 0.1 °C (± 0.2 °F)
Humidity: ± 0.1%
Control accuracy: Humidity: ± 5% RH from 20 to 100% RH at 50 to 90°F (10 to 32°C)
Humidification setpoint range: 10% RH to 90% RH
Dehumidification setpoint range: 15% RH to 95% RH
Outdoor air temperature range: -40 °C to 50 °C ( -40 °F to 122 °F )
Binary inputs: Relay dry contact only across “Scom” and “DI1” terminals
Contact output rating: Each relay output: 30 Vac, 1 Amp. Max. / 30 Vac, 3 Amp. in-rush
Analog output rating 0 t0 10 Vdc into 2K Ω resistance minimum
Wire gauge 18 gauge maximum, 22 gauge recommended
Dimensions: 4.94” x 3.38” x 1.13”
Approximate shipping weight: 0.75 lb ( 0.34 kg )
Agency Approvals:
UL UL 873 (US) and CSA C22.2 No. 24 (Canada), File E27734 with CCN
XAPX (US) and XAPX7 (Canada)
FCC Compliant to CFR 47, Part 15, Subpart B, Class A (US)
Industry Canada ICES-003 (Canada)
CE EMC Directive 89/336/EEC (Europe Union)
C-Tick AS/NZS CISPR 22 Compliant (Australia / New Zealand)