DewStop FS-875 - User Manual

4
1
2
3
5
CONTROL
WHITE BLACK RED
GROUND
BLUE
120V LINE AC
WALL ENCLOSURE
LIGHT
FIGURE #1
FAN
FIGURE #2
FIGURE #3
ENGLISH
LANGUAGE
MANUAL
FS-875
FS-3875
Bath Fan Timer Control
with Light Control
ADJUSTABLE
FAN TIMER
(D.) MOUNTING IN WALL ENCLOSURE
1. Attach wires (as shown in FIGURE #1).
WARNING
Turn OFF circuit breaker or remove fuse(s) and test
that power is OFF before wiring. Wiring this control
live can cause serious risk of electrical shock
and/or damage the control, voiding the warranty.
FOR SAFETY, THIS PRODUCT MUST BE
INSTALLED IN A GROUNDED WALL ENCLOSURE. If
you are unfamiliar with methods of installing
electrical wiring, secure the services of a qualified
licensed electrician. USE ONLY COPPER WIRE, DO
NOT use aluminum wire with this device.
IMPORTANT
Read each step carefully and perform in sequence.
This control will not work or will become damaged
if wires are connected incorrectly. To prevent
damage, connect this control exactly as shown in
the installation diagrams, otherwise warranty will
be voided. Prior to wiring, straighten or clip ends of
wire such that ends of each wire are straight (if
using this control to replace an existing switch).
Strip wire insulation at the end of each wire to
expose 5/8 inch (16 mm) of copper. Where
instructed to make a connection, twist ends of
stripped wires together and twist a proper
connector clockwise until secure.
(C.) INSTALLATION STEPS
1. WARNING
To avoid fire or risk of electrical shock, turn OFF
power at circuit breaker or disconnect fuse. Test the
power is OFF before you begin wiring.
2. BEFORE YOU MOUNT THE CONTROL
(new installation) Install control in a 3½ inch deep
single-gang or multi-gang electrical wall enclosure.
OR (replacement of existing switch) remove
existing wall plate and switch device being
replaced.
3. ATTACH POWER WIRE, LIGHT WIRE, AND
FAN WIRE
Attach 120V AC 60Hz 3-wire power (Hot / Neutral /
Ground) inside the wall enclosure with a minimum
of 6 inch leads. Attach fan three wire leads inside
the wall enclosure also with minimum 6 inch leads.
If an existing power connection is used in an
existing wall enclosure you must confirm proper AC
120V Hot / Neutral / Ground are available.
4. CONNECT WIRING
General instructions for all configurations:
Make sure the wall enclosure, fan, light, and
control are properly grounded. (See FIGURE #1).
Make sure ground wire is securely fastened. Tighten all
ground screws or wire nuts securely. Use the proper
sized wire nut for #14 or #12 wire. Make sure to strip
back the copper wire 5/8 inch and twist wire and
nut clockwise.
(A.) ABOUT
This timer is designed to give you all the options, all the
control you need, to make sure your bathroom, laundry
room, sun room, or spa room gets all the ventilation it
should have. It's really two timers in one: A countdown timer
and a fresh home / Minutes Per Hour (MPH) timer ‒ and,
best of all, the two timers work together. The countdown
timer can be set anywhere from 5 to 60 minutes, and it
activates any time you manually turn the fan on. The MPH
timer can be set to anywhere from 0 to 60 minutes, and it
runs your fan for a set time every hour to expel stale air and
help you maintain good indoor air quality (just the thing for
complying with local indoor air quality standards, such as
ASHRAE 62.2). The MPH timer also sees when you've
used the countdown timer and knows not to run the fan for
a while if you've already done it. If you want to manually
shut the fan off when the MPH timer is running, you can do
that too, just by pressing the fan on/off button.
(B.) INSTALLATION INSTRUCTIONS
CAUTION
1. Use only a 120V AC 60Hz power supply
connection.
2. For indoor use only.
3. Do not exceed this control’s maximum electrical
load ratings, as indicated on the product label.
4. Must be installed and used in accordance with
your local electrical codes.
5. If a bare copper or green ground connection is
not available in the wall box, contact a
licensed electrician for installation.
6. For use with permanently installed 120V AC
powered fans only.
7. Use only #14 or #12 copper wire connections.
3. Attach the wall plate (See FIGURE #3).
2. Tuck wires into wall enclosure and fasten control to
the wall enclosure with the two screws provided
(See FIGURE #2).
Seattle, WA, USA
Go To Research
Technologies, Inc.
from

Summary

About the Adjustable Fan Timer

Installation and Safety

Installation Cautions

General cautions for installation, including power supply, indoor use, load ratings, local codes, ground connection, and fan type.

Pre-Installation Safety Procedures

Essential safety steps: turn off power at the breaker and test before starting any wiring.

Wiring and Connection Steps

Step-by-step guide for wiring, connecting wires, and ensuring proper grounding.

Mounting the Control

Instructions for tucking wires and fastening the control unit into the wall enclosure.

Control Functions and Settings

Control Functions Overview

Description of the Blue LED Light, Light ON/OFF, and Fan ON/OFF controls.

Changing Timer Settings

Instructions on how to adjust countdown and Minutes Per Hour (MPH) timer settings using the included tool.

Countdown Timer Function

Explanation of how the countdown timer operates to automatically shut off the fan after a set period.

Minutes Per Hour (MPH) Timer

Details on the MPH timer for maintaining indoor air quality by running the fan periodically.

Timer Interaction

How the countdown and MPH timers work together, including manual overrides and credits.

Testing the Control

Procedure to test the fan and light functions after installation and setting adjustments.

Warranty Information

Two-Year Limited Warranty

Details of the two-year limited warranty, including coverage, limitations, and service request procedures.

Overview

The DewStop FS-875/FS-3875 Adjustable Fan Timer is a sophisticated control designed to manage ventilation in bathrooms, laundry rooms, sun rooms, or spa rooms, ensuring optimal indoor air quality. This device integrates two distinct timers: a countdown timer and a Minutes Per Hour (MPH) timer, which work in conjunction to provide comprehensive ventilation control.

The countdown timer allows users to set the fan to run for a specific duration, ranging from 5 to 60 minutes. This timer is manually activated whenever the fan is turned on. It's particularly useful for situations requiring immediate ventilation, such as after a shower or bath, to quickly remove moisture and odors. The recommended usage for this timer involves adding the time it takes to shower with the time it takes for the bathroom to dry off afterward, and setting that total as the timer duration.

Complementing the countdown timer is the Minutes Per Hour (MPH) timer, which operates on a recurring schedule to maintain consistent air quality. This timer can be set to run the fan for a specified number of minutes every hour, with settings ranging from 0 to 60 minutes. For instance, if set to "10," the fan will activate for 10 minutes every hour. A setting of "0" means the MPH timer will never turn on, while "60" means the fan will run continuously. The MPH timer is designed to help comply with local indoor air quality standards, such as ASHRAE 62.2, by regularly expelling stale air.

A key feature of this device is how the two timers interact through a "credits" system. The MPH timer is programmed to recognize manual fan usage. If the fan is manually run for a certain period, the MPH timer will credit that usage and adjust its subsequent run times accordingly. For example, if the MPH timer is set to run for 20 minutes per hour, and the fan is manually run for 10 minutes, the MPH timer will only run for an additional 10 minutes in that hour. This credit system operates within a rolling 3-hour window. If the fan is manually run for an extended period, the MPH timer will take credit for that usage and may not run for the next few hours, effectively preventing redundant operation and saving energy.

The control also offers manual override capabilities. If the MPH timer is running and the user wishes to activate the countdown timer for a shower or bath, pressing the "Fan ON/OFF" button twice will cancel the MPH timer and initiate the countdown timer. Conversely, if the MPH timer is running and the user manually turns the fan OFF, this action cancels the MPH timer for that specific hour, with normal function resuming after one hour.

The device includes a Blue LED Light, which illuminates when the fan is active, a useful feature for fans with low sound levels. It also features a separate Light ON/OFF button to control the bathroom light.

Installation of the DewStop fan timer requires careful attention to electrical safety. Before beginning, it is crucial to turn off power at the circuit breaker or disconnect fuse and test to ensure power is off. The control must be installed in a 3½-inch deep single-gang or multi-gang electrical wall enclosure. For replacement installations, the existing wall plate and switch device should be removed. The device requires a 120V AC 60Hz 3-wire power connection (Hot/Neutral/Ground) and connects to the fan's three wire leads. All connections, including ground wires, must be securely fastened using appropriate wire nuts for #14 or #12 copper wire, with 5/8 inch of insulation stripped from the copper wire ends.

The timer settings, for both countdown and MPH, are adjustable. By default, the countdown timer is set to 30 minutes, and the MPH timer to 0 minutes. To change these settings, the "Timer Settings" cover must be removed from the face plate. This is done by inserting the end of the included tool (or a non-metal tool) into two holes on either side of the control. The settings dials can then be turned to the desired durations. Any changes made to the settings will take effect after the next ON/OFF cycle, so it's recommended to turn the fan ON then OFF after making adjustments.

Testing the control after installation involves turning on the breaker to apply power. If the breaker trips or fuse blows, it indicates a problem that requires investigation by a qualified electrician. Once power is restored, the user can test the fan by pressing the Fan ON/OFF button to ensure it turns ON and OFF, and similarly test the Light ON/OFF button.

The device is designed for indoor use only and must not exceed its maximum electrical load ratings. It is essential to install and use the control in accordance with local electrical codes. If a bare copper or green ground connection is not available in the wall box, a licensed electrician should be contacted. The control is intended for use with permanently installed 120V AC powered fans only.

For maintenance and safety, it is imperative to always turn off the electrical circuit breaker or fuse before working on the fan/light or any appliance connected to this control. This device is an automatic ON device, meaning one of its timers could activate the attached device while work is being performed, posing a shock hazard. If unfamiliar with electrical wiring methods, the services of a qualified licensed electrician should be secured. The use of aluminum wire with this device is prohibited; only copper wire should be used.

The DewStop Adjustable Fan Timer is backed by a two-year limited warranty from Go To Research Technologies, Inc. (GTR). This warranty covers defects in materials and workmanship under normal use and service. It does not cover normal maintenance, faulty installation, or repairs contrary to recommended instructions. In the event of a defect, GTR will, at its option, repair or replace the product or part without charge. To qualify for warranty service, the original consumer purchaser must notify GTR, provide the model and part number, describe the defect, and present evidence of the original purchase date.

DewStop FS-875 Specifications

General

Model	FS-875
Brand	DewStop
Material	Plastic
Color	White
Voltage	120 VAC
Operating Temperature	32°F to 122°F (0°C to 50°C)
Mounting Type	Wall