White Rodgers NP100 User Manual

The White Rodgers NP100 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.

1. Preparations 2. Description 3. Precautions 4. Specifications 5. Installation 5.1 Wiring Diagrams 6. Check Operation 6.1 Fan Operation 6.2 Heating System 6.3 Emergency System 6.4 Cooling System 7. Operating Features 8. Programming 9. Installer Configuration 10. Troubleshooting

Preparations

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, wallplate, and screws. 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.

Description

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.

Precautions

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).

Specifications

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)

Installation

Turn off power to the HVAC system. Remove old thermostat: Expose wires, label wires by terminal (R, W, Y, G, etc.), remove wallplate. Install new wallplate: Secure to wall with screws, match and connect wires to corresponding terminals. Set ELEC/GAS switch based on system type. Set cycle rate (fast/slow) for hydronic systems. Set FAN to AUTO and SYSTEM to HEAT or COOL.

Wiring Diagrams

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.

Check Operation

Restore power. Set SYSTEM to HEAT/COOL, FAN to ON/AUTO, adjust setpoint to test.

Fan Operation

Set FAN to ON; fan should run continuously.
Set FAN to AUTO; fan should run on call for heat/cool.

Heating System

Set SYSTEM to HEAT.
Adjust setpoint above room temperature; furnace should activate.
Adjust below; furnace should stop.

Emergency System

Not applicable for single-stage systems; use SYSTEM to OFF to disable.

Cooling System

CAUTION! Do not operate below 50°F.

Set SYSTEM to COOL.
Adjust setpoint below room temperature; AC should activate.
Adjust above; AC should stop.

Operating Features

Display: Shows room temperature and setpoint.
Key Features: Manual temperature adjustment, change filter reminder, adjustable temperature display, ELEC/GAS switch, cycle rate adjustment, reset function for voltage spikes or static discharge.

Programming

None (non-programmable thermostat).

Installer Configuration

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.

Troubleshooting

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