Nortec GS Series - Manual (Page 23)

GS Series Installation | 20
Electrical and Plumbing
Electrical
Primary Wiring
All work concerning the electrical installation must be performed by qualified personnel.
Warning:
The electrical parts inside the humidifier are very sensitive to electrostatic discharge. Appropriate
measures against electrostatic discharge (esd protection) must be taken when carrying out installation
work.
The humidifier should only be connected to primary power (main power) after all installation work has been
completed.
An external disconnect switch must be installed close to the unit to allow for power interruption during
servicing and/or maintenance.
Humidifiers require field wiring to primary voltage terminal blocks. Depending on the unit, power
requirement must be 120 Vac or 208-240 Vac, 15 A, 20 A or 30 A separately fused circuit, single phase.
See Table 4 for details. Use only copper wire with a minimum 70 °C (158 °F) temperature rating. Wiring
can be fed through a 7/8" hole on the bottom or the top of the control compartment.
When installed, the appliance must be electrically grounded in accordance with local codes or, in the
absence of local codes, with the National Electrical Code, ANSI/NFPA 70, and/or the CSA C22.1 Electrical
Code, if an external electrical source is utilized.
External wiring sizes must be in accordance with NEC and/or CEC and existing local electrical codes and by-
laws.
Low Voltage Control Wiring
All GS models require at least one type of input control signal for unit operation. Refer to the sections below
that detail the types of controls that can be used with each model.
Low voltage control terminal strips are provided in the electrical compartment. Internal sides are factory
wired. External sides are to be field wired. Refer to the specific control-wiring diagram supplied with each
unit.
Field wiring from humidistat to humidifier and between devices should be shielded 18 AWG or heavier and
kept as short as possible.
Controls are available from NORTEC as accessories and can be ordered with the humidifier. Controls by
others may also be used as long as they meet the criteria noted below. The following is a summary of the
common types of controls that may be used with NORTEC Gas Humidifiers.
Wall or Duct Mounted Control On/Off Humidistat: Wired to make on drop in humidity, break on rise to
setpoint. Set to desired RH. Can be a make/break set of contacts from a Building Automation System.
Duct Mounted Safety High Limit On/Off Humidistat: Wired to make on drop in humidity, break on rise to
safety setpoint. Set to approximately 85% RH as a safety to prevent saturation and wetting in the duct.
Highly recommended for ducted applications.
Duct Mounted Safety Air Proving On/Off Switch: Wired to make when sensing air flow, break when no air
flow. Used as a safety to prevent saturation when there is no air flow. Highly recommended for ducted
applications.