0050206002544

Master Flow

Model H1

Internet #100023416

Store SKU #144657

Manually Adjustable Humidistat for Power Vents

$30.27 /each
  • Adjustable Humidistat
  • Used with Master Flow Brand PG and PR Series Power Ventilators
  • Pre-wired for installation

Frequently Bought Together

Product Overview

Use the Master Flow Adjustable Humidistat with all Master Flow power vents. The humidistat helps reduce the likelihood of damaging moisture or heat from accumulating in your attic. Manually adjustable for varying climate conditions.

  • Humidity-activated humidistat can be adapted to accommodate all climate conditions
  • Designed for use with all Master Flow and LL Building Products power vents
  • For use with power ventilators rated not more than 7.5Amps
  • Constructed from galvanized steel for a durable design
  • Manually adjustable setting from Stop to 20% humidity
  • Pre-wired for simple installation

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Customer Questions & Answers

9 Questions18 Answers

Customer Questions & Answers

Manually Adjustable Humidistat for Power Vents
Manually Adjustable Humidistat for Power Vents

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3 answers

How to set this Humidistat to run at 70%??

This question is from Manually Adjustable Humidistat for Power Vents
Asked by
Fairfax, VA
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May 28, 2016
I installed this humidistat along with MasterFlow 1250 CFM Power Roof Mount Vent (Model # PR2DWW) with wires connection as directed on humidistat cover (white-white, black-black).
I set the thermalstat to 105F and set the humidistat to 70% (as suggested). When temperature in attic above 105F, fan did NOT run. I had to tune the humidistat to DRY in order for fan to run.

What should I do?
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Answers (3)

Asked by
New Orleans, LA.
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Home Improvement Profile: DIYer
August 9, 2016
Answer: 
It sounds like you have the humidistat wired in series with the thermostat instead of in parallel with it.
It is my understanding that the combined setup of those two control units, when properly wired, should create an either-or situation, meaning that if humidity gets above the set percentage and/or the temperature gets above the set level the appropriate control unit for that condition will energize
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It sounds like you have the humidistat wired in series with the thermostat instead of in parallel with it.
It is my understanding that the combined setup of those two control units, when properly wired, should create an either-or situation, meaning that if humidity gets above the set percentage and/or the temperature gets above the set level the appropriate control unit for that condition will energize the power vent's fan motor.
You appear to have the humidistat wired so that it gets fed by the main power line but then the thermostat's main power input has been connected to (is being fed from) the humidistat's switched output instead of the thermostat's power input also being connected to (fed from) the main power line (you have them wired in series instead of parallel) so what's happening is that the thermostat isn't getting any power to be able to turn on the fan unless the humidistat's set percentage is already exceeded.
Each unit has a power input connection and an internally switched output connection.
Both units' electrical input needs main power, both units' switched output need to go to the fan.
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Asked by
butler
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Home Improvement Profile: Professional
July 26, 2016
Answer: 
Theres an arrow on the little white knob that needs to point at 70 an the incremented dial around it
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May 31, 2016
Answer: 
These devise operate in parallel with each other. The thermostat should be set to 105 F to the summer months and the humidistat to "STOP" until fall or winter, then set to 70%. Please call Technical Services, M-F 8A-5P EDT, with any additional questions.
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3 answers

Will the H1 work to turn on a stand alone humidifier if the humidity drops below a certain level?

This question is from Manually Adjustable Humidistat for Power Vents
Asked by
Pittsburgh, PA
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January 28, 2016
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Asked by
butler
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July 26, 2016
Answer: 
No, other way around. Contacts close on rise
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Asked by
butler
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July 26, 2016
Answer: 
No. it turns on equipment at certain set-point when humidity is getting to a higher level.
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February 1, 2016
Answer: 
No, this item is designed to operate with MasterFlow attic fans only. Please call MasterFlow Technical Services at 800-211-9612, M-F 8A-5P ET, with any additional questions.
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3 answers

Is this wired in series or parallel with the fan's thermostat?

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Asked by
Selden, NY
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September 9, 2015
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Asked by
butler
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July 26, 2016
Answer: 
done paralel
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Asked by
Selden, NY
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September 14, 2015
Answer: 
@MasterFlow -- I was told by the good folks at Home Depot that this humidistat would not work with the Master Flow fan with an existing thermostat. So I've since cancelled the order for the humidistat and ordered the combination thermo/humidistat (for an additional $40.00). Did I just waste my money on the more expensive box?
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September 14, 2015
Answer: 
Thank you for contacting MasterFlow ... The H1 Humidistat is wired in parallel. Please call or email our Technical Services Group for instructions. 800-211-9612 or warrantyllbp@gaf.com.
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3 answers

Which way do the contacts work? I want my fan to run when humidity is 40 percent or greater. I want to dehumitify

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Asked by
Newark,OH
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July 28, 2015
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Asked by
butler
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July 26, 2016
Answer: 
Contacts close on rise. It will work for your app.
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Asked by
Arkansas
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August 5, 2015
Answer: 
I am going to install a master flow 1600 cfm attic fan in the near future. I will be using the temperature setting of 95 degrees in the summer, and the humidistat setting of 45 % in the winter.
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July 30, 2015
Answer: 
Thank you for contacting Master Flow ... Our devices are designed as a set point device. Set the humidity to 40% and the fan will continue to run until the 40% set point has been reached. Reminder, we recommend a set point of 70%. You fan may run continuously at 40%. Please contact our Technical Services Group at 800-211-9612 with any additional questions or concerns.
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Customer Reviews

Rated 4.6 out of 5 by 5 reviewers.
Rated 5.0 out of 5.0 by added to newly purchase attic ventilator Installation was made by a qualified electrician, but was quite simple. We did call the company to make sure how to properly wire it so the humidistat and thermostat worked separately. The instructions were not included for that. But, it works fine. It's come on several times in the early morning when it's very humid here in the South. I would definitely recommend including this if you install a thermostatically controlled attic ventilator fan. August 10, 2016
Rated 5.0 out of 5.0 by A "must purchase" for older homes This humidistat is a must have accessory for its matching gable mount attic fan which comes only with an adjustable thermostat. Especially in older homes with less or no attic insulation, it is critical to remove humidity which may leak from heated living spaces below into the attic during winter months. Unless this is done, damage to the underside of roofing underlayment will occur and it is conceivable that condensation and melting of ice formed inside the attic on roofing nails protruding through the underlayment will penetrate ceilings and leave water stains. My only issue with this humidistat unit is the wiring diagram stamped on the unit housing. It does not contemplate its use with a thermostat, so if one follows the diagram during installation the thermostat will not turn the fan on at the recommended 105 degrees in the Summer. Oddly, one must call the customer service number for the manufacturer and provide your email address at which they will email you the correct wiring diagram to connect the humidistat to the thermostat and allow them to work together properly. Seems to me it would be easier to just include a small paper insert in the box for either the thermostat or the humidistat to illustrate the combination set-up if you wish to use both units in series rather than the current "need-to-know" system. August 17, 2016
Rated 4.0 out of 5.0 by not many to choose from. All that is needed for the application! What else besides t-stat is needed to control attic fan July 12, 2016
Rated 4.0 out of 5.0 by great product Good product, easy to install, may need adjusting to your attic, buy over all OK. November 10, 2015
Rated 5.0 out of 5.0 by DUAL use! Great product! Let's you make DUAL use of your attic fan. June 10, 2014
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