Field Controls 72000 Installation And Owner's Manual

TECHNICAL BULLETIN

TB 213 P/N 090375A0213 REV. H 10/2011 Copyright © 2011, Field Controls Inc., All Rights Reserved

Field Controls Inc. 2630 Airport Road Kinston, NC 28504 PH: 252.522.3031 FAX: [phone]

Field Controls Model 072000

space. Field Controls recommends an

®

Smart Digital Humidistat

Installation and Owner's Manual

Package includes:
1 #072000 Smart Humidistat

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1 Foam Gasket
1 Mounting Template
1 Technical Bulletin #TB213
2 Mounting screws
2 Wall anchors
1 #OAS Outside Air Sensor

General Description

The 072000 is a digital humidifier control
that can automatically adjust the indoor
humidity set point as the outside air
temperature changes. This intelligent
control will maintain accurate humidity
levels and a more comfortable indoor
environment.

The actual indoor relative humidity is
always displayed on the LCD screen. When
the UP or DOWN keys are pressed, the
humidity set point is displayed and can be
adjusted using the UP and DOWN arrow
keys.

An outdoor temperature sensor is included,
and must be connected in order to fully
utilize the features of the 072000. The
outdoor temperature sensor allows the
humidistat to automatically adjust the
humidity set point, to avoid condensation on
windows. It is also a convenient way to read
the outdoor air temperature at any time.

The outdoor sensor is not required to
use the Humidistat in the basic or
manual mode.

The 072000 operates on 24vac, and has
a set of isolated dry contacts for
activating the humidifier. Terminals are
also provided for the Outdoor air
Temperature Sensor. (Part# OAS)

The 072000 can be installed on the
return air duct or, it can be installed on an
interior wall within the conditioned

interior wall installation. NOTE: If the
return air duct is chosen as the location,
the HVAC fan should be set to run
continuously, in order to obtain an
accurate sampling of the actual living
space relative humidity condition.3

1

Displaying the Relative Humidity

The 072000 normal display shows the humidity
level in the home. The example at right shows
the humidity reading at 36%. The “RH” symbol
blinks when the humidistat is requesting (calling
for) humidification. The “RH” symbol remains
steady when the humidity set point is satisfied.

NOTE: Allow 24 hours for the 072000 to fully
stabilize and display the accurate humidity
level in your home.

Changing the RH Setpoint

When the up or down %RH keys are pressed
once, the 072000 displays the relative humidity
set point. Holding the UP key will raise the RH
set point and, holding the DOWN key will lower
the RH set point.

RH

Upon initial power up, the 072000 defaults to
an RH set point of 30% RH. You can adjust the
set point as desired no matter which mode of
operation you prefer. See "Selecting Manual

Operation" and “Selecting Automatic
Operation" for more information on the proper

setting of the RH set point.

Displaying the Outdoor Temperature

Pressing the OD TEMP key will display the
outdoor temperature. The 072000 will display
outdoor air temperatures from -9 to 98°F.

Selecting Manual or Auto Operation

Moving the AUTO/MAN switch to the MAN
position selects manual operation. The 072000
will maintain the RH set point selected with the
up and down %RH keys. As the outdoor
temperature changes, the home-owner will
have to re-adjust the RH set point to achieve a
co mf o r t ab le e nv ir o n m en t an d av oi d
condensation on windows and walls.

%RH

RH

OD

OD

TEMP

AUTO MAN

Table 1 shows the suggested RH set points
for different outdoor air temperatures.

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°F

0

3

°F

0

2

°F

0

1

F

°

0

F

°

9

-

A
%

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3

3

2

2

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AUTO MAN

OUTDOOR

TEMPERATURE

+35°F

+30°F

ADJUSTED

%RH

40%

38%

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able 1. Suggested RH manual set
points for different outdoor
temperatures.

Selecting Automatic Operation

Moving the AUTO/MAN switch to the
AUTO position selects automatic
o pera t i o n . T h e 0 7200 0 w i l l
automatically adjust the RH set point
up or d own as the out doo r
temperature changes. You do not
have to adjust the RH set point
unless you want to. Simply push the
UP or DOWN arrow to increase or
decrease the humidity level in the
home. The 072000 will calculate and
display the new set point on the LCD
screen.

+25°F

+20°F

+15°F

+10°F

+5°F

0°F

-5°F

-9°F

Table 2. Computer adjusted RH set
points for different outdoor air
temperatures based on a 40% RH
setting.

35%

33%

30%

28%

25%

23%

20%

18%

NOTE: Adjusting the base set point will
change the calculated set point, when the

Table 2 shows the adjusted RH set
poi n t s f o r d i ff e r e nt o ut d o o r
temperatures, using a base set point
of 40% relative humidity. The 072000
computer will automatically lower the
RH set point as the outdoor
temperature falls below 35°F. Above
35°F., the 072000 will operate based
on the base set point.

outside air temperature drops below 35°F.
The 072000 will display thenew set point
after the processor has calculated a new
set point based on theoutdoor air temperature.

3

Wiring Diagrams for 072000 Humidistat

The diagram below shows the wiring for the S-2000 and S-2020 Steam Humidifiers

The diagram below shows the wiring arrangement with an external 24vac transformer
To power up the 072000 and the humidifier.

Outdoor

Temperature

Sensor

To

Thermostat

Standard

Furnace/Air Handler

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HUMIDIFIER

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0
72000

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7

0

Outdoor

Temperature

Sensor

Line Voltage

120VAC, 60Hz

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24VAC Transformer

S-2000/S-2020 STEAM HUMIDIFIER

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REFER

TO THE

S2000/2020

OWNERS

MANUAL

OWNERS MANUAL

NOTE: High voltage may cause serious injury from electrical shock.
Disconnect electrical power to the HVAC system before starting the
installation.

To/From

HVAC System

Terminal Block

REFER TO THE

S2000/2020

NOTE: Sharp edges may cause serious injury from cuts. Use
care when cutting template openings and handling any duct work.

4

Installation, Duct Mounting

The Humidistat can be installed on the return air duct to sense the humidity level whenever the fan is
operating. Use the "Duct Mounting Template" provided to cut an opening in the duct for airflow to the
humidity sensor and two holes for the mounting screws. Use the foam gasket to create a seal

against the sheet metal. Also punch a 1/4” hole in your duct and route the wires into the duct and out

the new opening. This allows you to make your connections easily without having to route the wires
through the vented ribs.

DO NOT REMOVE the vent covers when installing this device on the return duct, or only remove
what is necessary to run your wires through a vent/rib opening.

WIRING

The wiring can pass through the duct or
enter the subbase through an open vent
rib at the bottom or top of the subbase.

Warning: Leave the vent hole
covers in place, when mounting
the Humidistat on the return air
duct! Only remove as much vent

cover material as necessary to
route your wires.

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All work should be done to local and
national codes and ordinances.

Use color-coded, multi conductor 18
awg, solid copper wire.

Wire number to number or letter to
letter on each control.

Installation, Wall Mounting

The Humidistat can be installed on a wall within
the conditioned space. Use the "Wall Mounting
Template" provided to cut a small opening in the
wall for the wiring and drill two pilot holes for the
mounting screws. Use the foam gasket to create

a seal against the wall if desired.
Warning: Seal up the wire hole made in the

wall to prevent air leakage from effecting the
RH sensor on the 072000 printed circuit board.
Use plumbers putty, wall compound, or even duct
tape to seal the hole.

Route wires through vent ribs
when inserts are removed, or
route wires thru duct and come
in behind the sub-base.

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Route wires through

this hole.

Use the supplied

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wall anchors if

necessary.

Remove the plastic covers

at all vent ribs at the top and bottom

of the subbase,

when mounting on interior walls.

5

Attaching the 072000 Humidistat

After installing and wiring the subbase, attach the 072000 by placing the front
over the two top subbase brackets, and swinging the front cover down and
snapping it in place. Power up the 072000 after attaching it to the subbase.

Front

Sub-Base

BE SURE TO PEEL OFF THE PLASTIC
PROTECTIVE FILM FROM THE FRONT
DISPLAY WHEN THE INSTALLATION IS
COMPLETE.

Wall or Duct

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SUBMITTAL SHEET

The “OAS” Outside Air Sensor allows precise real time monitoring of the Outside Air temperature on your Zoned HVAC
BMPlus series or UZC series control panels system. The Optional “OAS” wires directly into the allowing the Control

System to monitor the outside air temperature in heating mode. Using the adjustable potentiometer on the Control
Panel, the installer can set the desired outdoor temperature changeover setting, to engage supplemental or backup
heating systems.

The OAS comes standard with the HK2000 Economizer System and the 072000 Smart Digital Humidity Control.

Refer to the HK2000 and the 072000 Technical Bulletins for the specific Outside Air Features & Functions provided, with
these products.

The OAS is a versatile device because it can be mounted on an outside wall or an outside air duct. See Page 2 & 3.
Make sure the OAS is mounted completely outside of the house, on the North, East, or West side of the building. Avoid
direct sunlight. Do not mount the OAS low to the ground where snow can cover it. Do not mount the OAS close to exhaust

vents of any type. Use a dedicated 2 conductor 18AWG solid copper jacketed thermostat cable to connect the

OAS to the Zone Control System, Economizer or the Smart Humidistat. Avoid running cable in close proximity
to line voltage circuits, or inside a conduit with other circuits. Avoid wire runs in excess of 100 ft.

The Sensor wiring is not polarity sensitive. OAS equipped panels have a designated terminal block for the OAS. Be sure
to remove the factory supplied resistor on the Outside Air Sensor terminal block of the panel, and connect the
field wiring to those terminals instead. On some panels, make sure you enable the OAS Dip switch. Now dial in the
Outside Air Changeover setting you desire. Dual fuel Heat Pumps and Multi-Stage Heating systems can be controlled
without the need for bulky mechanical outside air thermostats or expensive dual fuel kits.

To test an OAS disconnect the wire leads from the control panel and remove it from the duct. At room temperature (75°F.)
the ohm reading on an OAS will be approximately 10.5K ohms (10,500 ohms). Or leave the OAS where it is and place a
separate temperature probe of known accuracy in the same location as the OAS and measure the OAS resistance
against the table provided on page 4. You should measure a value within 5% of the table value and the separate
temperature probe reading.

Model OAS
(OUTSIDE Air Sensor)

MAJOR PARTS INCLUDED IN THE “OAS” OUTSIDE AIR SENSOR ASSEMBLY

Cover Top View

7

Housing Side Open View

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CONTROLS INC.

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CONTROLS INC.

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385 Hwy. 33 Englishtown, NJ 07726
Ph: 800-446-3110 - Fx: 732-446-5362

Cover Side View

Sensor Assembly with Protective Sleeve & 12” wire leads

END CAP

5/16”
DIAMETER

Cover Bottom View

1/4” Tube Assembly with Integrated Back Plate

5 3/4” INSERTION

Housing Internal View

TM

Field Controls Inc. 2630 Airport Road Kinston, NC 28504 PH: 252.522.3031 FAX: [phone]

®

Model OAS

(OUTSIDE Air Sensor)

Forced Air Zone Controls

The “OAS” is constructed of UV stabilized Poly Carbonate Plastic with seamless
aluminum tubing frame and a highly accurate thermistor with 24awg 12” leads. The
unique construction provides a thermal barrier between the temperature probe and the
duct work allowing precise air temperature measurements.

To test an OAS, disconnect the wire leads from the control panel and remove it
from the duct or wall. At room temperature (75°F.) The ohm reading on an OAS will
be approximately 10.5K ohms (10,500 ohms). Or leave the OAS where it is and
place a separate temperature probe of known accuracy in the same location as the
OAS and measure the OAS resistance against the table provided below. You
should measure an approximate value within 5% of the table value and the
separate probe reading.

Temporarily
disconnect the OAS
from the field wires
to test continuity

TEMPERATURE (F)

-5

RESISTANCE/OHMS

100184

TEMPERATURE (F)

50

RESISTANCE/OHMS

19903

34K

OUTSIDE WALL

30*F

FIELD WIRES
CONNECTED
TO 072000
OR ZONE PANEL

INSIDE WALL

5

10

15

20

25

30

40

45

35

0

85340

72906

62460

53658

46220

39917

34562

30000

26104

22767

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60

65

70

75

80

85

90

95

100

17438

15313

13475

11884

10501

9298

8249

7333

6530

5826

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CONTROLS INC.

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