The White Rodgers NP110 is a non-programmable thermostat designed for controlling heating and cooling systems in residential settings. It is compatible with gas, oil, and hydronic heating systems, central air conditioning, and single-stage heating and cooling systems. Features include manual temperature control with up/down buttons, change filter reminder, adjustable temperature display, ELEC/GAS switch for system compatibility, fast or slow cycle rate selection, and fan operation (AUTO or ON). Below are the key specifications, installation, operation, and troubleshooting instructions.
Assemble tools: hand or power drill with 3/16 inch drill bit (if needed), flat blade screwdriver, wire cutter/stripper, level, voltmeter. Shut off power to the heating/cooling system at the main fuse or circuit breaker box until installation complete. Label wires before disconnecting. Verify package contents include thermostat, mounting screws and wall anchors (x2), 2 AAA batteries, terminal wire label stickers, installation instructions. This thermostat is for low voltage systems only; not for line voltage. Install away from drafts, direct sunlight, or heat sources for accurate sensing.
WARNING! Failure to read and follow all instructions carefully before installing or operating this control could cause personal injury and/or property damage. Save these instructions.
The thermostat is a non-programmable device with basic controls for temperature setting, system mode (HEAT/COOL/OFF), and fan operation (AUTO/ON). It includes an ELEC/GAS switch and cycle rate adjustment for compatibility with different heating systems. The LCD shows room temperature, setpoint, and status icons. Terminals: R (hot), W (heating), Y (cooling), G (fan), C (common).
Applications: Gas or Oil-Burning Furnaces: Yes; Hydronic Heating Systems (Steam or Hot Water Radiators): Yes; Central Air Conditioning Systems: Yes; Single-Stage Heating and Cooling Systems: Yes.
CAUTION! To prevent electrical shock/equipment damage, disconnect power at main fuse/circuit breaker until installation complete. Label wires prior to disconnection. If in doubt about wiring, consult qualified heating/air conditioning contractor.
WARNING! Do not use on circuits exceeding 24 VAC 50/60 Hz (1.5A per terminal, 1.5A max total); higher voltage damages control/causes shock/fire. Do not short terminals on gas valve/primary control to test; short/incorrect wiring burns out components/causes injury/property damage. Conform to NEC Class II circuits. Do not operate cooling below 50°F (compressor damage).
| Specification | Details |
|---|---|
| Type | Non-programmable |
| Switch Settings | ELEC/GAS, SYSTEM (HEAT/COOL/OFF), FAN (AUTO/ON) |
| Cycle Rate | Fast or Slow (SL) |
| Temperature Display | Adjustable |
| Compatibility | Gas, oil, hydronic heating; single-stage cooling |
| Power | Requires system power (typically 24V AC) |
Shut off power. Remove old thermostat cover. Label wires using terminal labeling reference chart (RH, RC, W, Y, G, etc.). Identify jumper wire for RC/RH. Disconnect wires one at a time. Remove old thermostat base from wall.
Mount new wallplate to wall using supplied screws and anchors if needed. Connect labeled wires to corresponding terminals. Set ELEC/GAS switch based on system type. Set cycle rate (fast/slow for hydronic). Install 2 AAA batteries and attach cover. Restore power.
| Wire Color | Terminal | Function |
|---|---|---|
| Red | R | 24V Power |
| White | W | Heating |
| Yellow | Y | Cooling |
| Green | G | Fan |
| Blue | - | Not typically used |
| Black | - | Not typically used |
Note: Refer to old thermostat wiring for exact matches.
Restore power. Set SYSTEM to HEAT/COOL, FAN to ON/AUTO, adjust setpoint to test.
Not applicable for single-stage systems; use SYSTEM to OFF to disable.
CAUTION! Do not operate below 50°F.
None (non-programmable thermostat).
Set ELEC/GAS switch (GAS for gas/oil, ELEC for electric). Select cycle rate: Fast (default) or Slow (SL) for hydronic systems. Configure filter reminder (can be enabled/disabled). Adjust temperature display if needed.
| Problem | Possible Cause | Corrective Action |
|---|---|---|
| Display blank or erratic | Voltage spike/static discharge | Reset: Move SYSTEM to OFF, press both buttons, then move to HEAT while holding buttons |
| Heating not working | Wrong wiring or switch setting | Verify wiring labels and ELEC/GAS switch |
| Fan not running | FAN switch not on or wiring issue | Set FAN to AUTO or ON; check wiring |
| Temperature display inaccurate | Factory calibration drift | Adjust displayed temperature using calibration feature |
| Filter reminder not displaying | Reminder not enabled | Enable filter reminder in options menu |