White-Rodgers Model M30 Thermostat
Installation Instructions
Contents
- Preparations
- Thermostat Features
- Removing Old Thermostat
- Mounting and Wiring
- Set Heat Anticipator
- New Thermostat Operation
- Specifications
- Troubleshooting
Your Thermostat Replaces
| Description | Replaces |
|---|---|
| Standard Heating & Cooling Systems - 4 or 5 wires | No |
| Standard Heat Only Systems | Yes |
| Millivolt Heat Only Systems - Floor or Wall Furnaces | Yes |
| Standard Central Air Conditioning | No |
| Gas or Oil Heat | Yes |
| Electric Furnace | Yes |
| Hydronic (Hot Water) Zone Heat - 2 Wires | Yes |
| Hydronic (Hot Water) Zone Heat - 3 Wires | No |
| Heat Pump | No |
| Baseboard Electric Heating or Line Voltage (120 or 240 Volt) | No |
1 Preparations
Assemble tools required as shown below:
Tools: Hand or power drill with 3/16 inch drill bit (if needed), flat blade screwdriver, wire cutter/stripper.
Caution: Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury and/or property damage.
2 Thermostat Features
The thermostat features a cover, base, mounting screws, and an adapter plate. The base includes terminals for wiring and a heat anticipator adjustment mechanism.
Figure 1 shows the thermostat components and the adapter plate.
3 Removing Old Thermostat
Caution: To prevent electrical shock and/or equipment damage, disconnect electrical power to the system at the main fuse or circuit breaker until installation is complete.
Before removing wires from the old thermostat's switching subbase, label each wire with the terminal designation it was removed from.
A standard heat thermostat typically consists of a cover and a base. The cover may be snap-on or hinge type. The base is removed by unscrewing mounting screws.
Note the anticipator setting on the old thermostat for future reference. The heat anticipator pointer, if adjustable, will be set at a number representing the current rating of the primary control in the furnace (e.g., .2, .4, .8).
If no heat anticipator is visible, proceed to the next step.
Attention: This product does not contain mercury. However, it may replace a unit that does. Do not open mercury cells. If a cell becomes damaged, do not touch spilled mercury. Use non-absorbent gloves to clean up spilled mercury and place it in a sealable container. Discard damaged units. Mercury must not be discarded in household trash. Refer to www.Thermostat-recycle.org for proper disposal locations.
4 Mounting and Wiring
Warning: Do not use on circuits exceeding specified voltage. Higher voltage will damage the control and could cause shock or fire hazard. Do not short out terminals on gas valve or primary control to test. Short or incorrect wiring will damage the thermostat and could cause personal injury and/or property damage.
Thermostat installation and all system components shall conform to Class II circuits per the NEC code.
- Mount base and adaptor plate: Mount the base to the wall using the provided screws (see Figure 1).
- Attach wires: Attach one wire to the R terminal and the other wire to the W terminal on the base.
5 Set Heat Anticipator
Set the anticipator to match the setting of your old thermostat or the current rating stamped on your main heating control. The heat anticipator is adjustable from 0.15 to 1.2 amps. Adjust by rotating the contact arm as shown in Figure 2. The setting is indicated by numbers on the base that the pointer aligns with.
If unsure about the setting, contact the heater manufacturer for a recommended setting.
Move the pointer counterclockwise to lengthen heating system cycles; move clockwise to shorten heating cycles. Adjustments should not exceed 1/2 marking at a time.
Snap on Cover: Carefully align the cover with the base and snap it onto the base.
Figure 2 illustrates the anticipator adjustment.
Diagrams show typical gas valve, oil primary, and zone valve wiring configurations.
6 New Thermostat Operation
After power is turned on, slide the temperature lever to the desired setting. To turn heat off, slide the lever all the way to the left until it clicks.
7 Specifications
Electrical Data
- Switch Rating: 24 VAC (30 VAC max.)
- Heating Switch Action: Snap Action
- Anticipator Rating (Heating): Adjustable from 0.15 to 1.2 Amps
Thermal Data
- Temperature Range: 50°F to 90°F (10°C to 32°C)
- Operating Humidity Range: 0 – 90% noncondensing
8 Troubleshooting
No Heat
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No Heat | 1. Blown fuse or tripped circuit breaker. 2. Furnace power switch to OFF. 3. Furnace blower compartment door or panel loose or not properly installed. 4. Pilot light not lit. 5. Broken or melted anticipator wire. 6. Loose connection to thermostat or system. 7. Thermostat or heating system requires replacement or service. |
Replace fuse or reset breaker. Turn switch to ON. Replace door panel to engage safety interlock or door switch. Re-light pilot. Excessive current or dead short in system. Have a qualified service person check the system. Verify thermostat and system wires are securely attached. Your furnace manufacturer or service person can describe how to test the heating system to verify it is operating correctly. If the heating system is capable of operation and the no heat condition persists, replace the thermostat. |
| Intermittent Heat | 1. Furnace Lock-Out Condition | Many furnaces have safety devices that shut the system down when a lock-out condition occurs. If the heat works intermittently, contact the furnace manufacturer or local service person for assistance. |
| Heat Runs Constantly. | 1. Possible short in wiring. 2. Possible short in thermostat. 3. Possible short in heat system. |
Check each wire connection to the thermostat to verify it is neatly looped under the terminals. No extra wire should stick out from under the terminals. |
| Furnace Cycles Too Fast or Too Slow Narrow or wide temperature swing | See Step 5, Adjusting the Anticipator. | The anticipation setting is the only adjustment that affects the heating cycle rate. If an acceptable cycle rate is not achieved using the anticipator, contact a local service person for additional suggestions. The location of the thermostat, size of the Heat/Cool System and current draw can influence the cycle rate. |
| Thermostat Setting and Thermostat Thermometer Disagree | 1. Thermostat thermometer setting requires adjustment. 2. Thermostat setting lever requires calibration. 3. Thermostat thermometer disagrees with other room thermometers. |
The thermometer can be adjusted by using a standard slotted screwdriver. Turn the thermometer pointer screw located inside the front cover to change the setting. For calibrating the setting lever, contact a local heating and cooling service person. The thermometer on the thermostat is accurately calibrated at our factory, but you can adjust it by using a standard slotted screwdriver. Turn the thermometer pointer screw located inside the front cover to change the setting. |
For California Residents
Warning: This product contains a chemical known to the state of California to cause cancer and birth defects and other reproductive harm.
