Thermostat replacement in a double wide

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Last updated on September 9th, 2017

Problem: Your HVAC system lacks a C-wire (common wire) for your new WiFi thermostat

Solution: Install a Venstar Add-a-Wire adapter!

Short a wire?

If you are lacking the (ironically named) “common wire”, also known as the C-wire, you might be pleased to learn that there’s an adapter for that.

The Venstar Add-a-Wire is an inexpensive, DIY-friendly alternative to running completely new HVAC wires.

From the manufacturer: In applications where additional wiring cannot be run to your programmable digital thermostat, the Add-A-Wire accessory can be used to add a wire to the thermostat.

Venstar Add-a-Wire on Amazon.com

Why add a wire?

In short, Wi-Fi thermostats need more power to run that always-on Wi-Fi connection. The C-wire a common wire that delivers a continuous flow of electricity to your thermostat.

Some manufacturers, like the Nest, claim that their thermostats work without a...

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Answer for USA, Canada and countries running a 60 Hz supply service.

A double pole thermostat is a line thermostat and not to be confused with a low voltage stat. When the heating load has 240 volts for a supply voltage, both lines from the distribution panel are supposed to disconnect when the thermostat reaches the set point temperature. A single pole thermostat is only used on a 120 volt heater an the return leg from the heater is a neutral wire.
A two pole thermostat can be used on a 120 volt circuit but a single pole thermostat should not be used on a 240 volt circuit. The reason being is that on a 240 volt circuit using a single pole thermostat, one "hot" leg doesn't get isolated from the heater and is always "hot" to ground. This is a shock hazard if you are working on the heater and depending on the thermostat as a disconnect from the distribution voltage.

Before you do any work yourself,
on electrical circuits, equipment or appliances
always use a...

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Replace your electric water heater thermostat using the step by step guide below.
Almost all residential water heater thermostats are interchangeable. However, a single element water heater thermostats will not work on a double element water heater.

Replacing an Electric Water Heater Thermostat

Turn the water heater power off. Remove the access
panel, insulation and the plastic safety cover.

Use your multimeter to make sure that the power
is off.

The pic on the left is of the top thermostat on a
duel element residential water heater.

The hot water heater thermostat is held tight against the tank with a bracket made of spring steel.

To remove the thermostat, pry one side of the bracket out with a screwdriver just far enough to release the thermostat.

Twist the thermostat to the side so the bracket can't pop back into place(see pic). Now pry the other side of the bracket out and pull the thermostat out.

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THERMOSTAT WIRE CONNECTIONS - CONTENTS: Guide to Thermostats for Heating and Air Conditioning Systems. Wall mounting, leveling, and wiring requirements vary depending on the type of room thermostat and what it needs to control. How to select the proper type of replacement thermostat for air condtiioning or heating systems. POST a QUESTION or READ FAQs about heating, air conditioning, and heat pump thermostat installation and wiring REFERENCES

InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

Room thermostat installation & wiring guide: this article series explains the basics of wiring connections at the thermostat for heating, heat pump, or air conditioning systems.

We provide Honeywell, White Rodgers & other thermostat wiring diagrams and explanation showing how to wire a room thermostat, including just what connections to make and how wires and connectors are color coded to...

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Many thermostats used in residences, businesses and industrial settings all used to contain mercury at one point. When the seasons change many people start thinking about upgrading their heating and cooling systems, which typically means replacing their old thermostats with new ones.

Do NOT throw your old thermostat in the trash if it contains a mercury switch! You should dispose of it properly

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Each mercury thermostat has an average of 4 grams of mercury in it. This seemingly small amount could pollute an 80-acre lake or 20 million gallons of water and result in a fish consumption advisory lasting a year. Research has shown thermostats are the single largest source of mercury in our homes and businesses. It's important to note mercury can hurt humans just as easily as it can pollute the environment. Talk about a double-edged sword. Medical experts have discovered mercury poisoning causes sensory impairment (i.e., vision, hearing, speech), disturbed sensation, lack...

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There is also a small round one-wire connector (not shown in the pictures below, mine has a black rubber cap) that has the O2 sensor voltage for testing purposes.

[Click above thumbnails for a larger image]

Note: On later model trucks, there is no separate fuel pump test connector, rather you have to use the diagnostic test connector (shown in photo C above) and follow the test procedure outlined in the Factory Service Manual, which involves placing a jumper wire between the "Fp" and "B+" terminals (see photo D). The Timing/Diagnostic jumper terminals (E1 - TE1) are shown in photo E.

The underlying problem is most likely that the winding on the circuit opening relay (see schematic above) that is energized by the ECU STArt signal is not working properly. Lacking this signal to energize the fuel pump, I get no fuel pressure while starting, until enough air flows through the AFM to trip its fuel pump contact. I hope to get the CO relay checked out and hopefully...

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6-cylinder Double Vanos Procedure (E46, E39)

The following information is provided for reference purposes only and should be used at your own risk
In no event shall Beisan Systems, LLC or its members be liable for incidental, consequential, or special loss or damages of any kind however caused.

Introduction

“Vanos” is BMW’s name for its variable valve timing units. Vanos units take on various shapes and design according to car year and model (engine model). The vanos discussed here is BMW part # 11-36-1-440-142. It’s a double vanos; meaning both the intake and exhaust valve timing is varied. This vanos unit is part of BMW 6-cylinder engines M52TU, M54, and M56. These engines were incorporated into a wide range of car models during years 1998-2006. They are found in the 3-series E46 98-05, 5-series E39 99-03 / E60 & E61 02-05, 7-series E38 98-01 / E65 & E66 02-05, Z3 E36 98-02, Z4 E85 02-05, X3 E83 03-06, X5 E53 00-06.

This vanos...

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Euro S50 Double Vanos Procedure (E36)

The following information is provided for reference purposes only and should be used at your own risk
In no event shall Beisan Systems, LLC or its members be liable for incidental, consequential, or special loss or damages of any kind however caused.

Introduction

“Vanos” is BMW’s name for its variable valve timing units. Vanos units take on various shapes and design according to car year and model (engine model). The vanos discussed here is BMW part # 11-36-1-404-701. It’s a double vanos; meaning the intake and exhaust valve timing is varied. This vanos unit is part of BMW 6-cylinder engine Euro S50B32. This engine was incorporated into three car models, the 3-series Euro E36 M3 96-99, Euro Z3 M Coupe 98-00, and Euro Z3 M Roadster 96-00.

This vanos has been experiencing a failure. It has been diagnosed that the failure is primarily due to deterioration of the vanos intake rod seal. It has...

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