WattMaster MG331-21-VAVCAV - Manual (Page 40)

Form: WMS-OE265-07-Humidistat-1A.doc
Page 1 of 1
VAV System
Description
The OE265-07 Duct Mounted
Humidistat is used with the
HVAC unit controller to initiate
dehumidification mode when the
relative humidity in the return air
duct rises above the user adjust-
able setpoint. The Duct Mounted
Humidistat is designed to be
mounted on the side of the HVAC
unit return air duct.
The Duct Mounted Humidistat is
adjustable for relative humidity
setpoints between 15% to 95%.
The Duct Mounted Humidistat
has a relative humidity differential
of 5%.
The electrical switch on the Duct
Mounted Humidstat is of the
snap-acting SPDT type. The
switch is rated at 8 Amps resis-
tive load and 345 VA pilot duty
load at 120 VAC.
The Humidistat is enclosed in a metal housing with a removable cover and duct mounting plate. The mounting
base plate face is labeled with relative humidity markings indicating relative humidity setpoints between 15% to
95%. A dial knob is provided for the adjustment of the relative humidity setpoint. The dial knob can be locked at
the setpoint position by tightening the dial lock screw to facilitate tamper proof installations.
Color coded wiring terminals are provided for wiring connections to the humidistat. A green grounding lead is
provided for grounding requirements.
Mounting
The Duct Mounted Humidistat is designed to be mounted on the side of the HVAC unit return air duct. 4 screws
are provided for mounting the humidistat to the return air duct. A mounting template is also provided to help lo-
cate the mounting holes and the duct cut-out on the duct wall.
Technical Data
OE265-07 Duct Mounted Humidistat
Humidity Sensing
Element Nylon Ribbon Electrical Switch Snap acting SPDT Rated at 8 Amps
Resistive Load. 345 VA Pilot Duty Load
Control Dial Settings 15 to 95% RH Location NEMA 1 Indoor Locations Only
Differential 5% RH Housing Painted Metal
Operating Humidity 5% to 95% RH Non-
condensing
Connections Color Coded Wire Terminals with Ground
Terminal
Operating Temp 40
°F to 125°F Weight 1.5 Lb.
Three Year Warranty WattMaster reserves the right to change specifications without notice
OE265-07 – Duct Mounted
Humidistat
50
% HUMIDITY
90
80
70 60
20
10
40 30 4.
75”
6.50”
1.25"
2.8
1
"
2.24"