The Honeywell T475A1057 outdoor reset controller is used for hot water or warm air heating systems and for line voltage, low voltage or millivolt (Powerpile) switching. The controller maintains proper balance between heating medium temperature and outdoor temperature by raising heating medium control point automatically as outdoor temperature falls. Does not replace safety high limit control and is not for use in system requiring resetting above 71F (21C) outdoor temperature.
Product Specifications
| Description |
Outdoor Reset Controller, 70 F to 140
F, 1:1.5 reset ratio, Tradeline model |
| Application |
Automatically raises heating control
setpoint as outdoor temperature falls |
| Type |
Remote bulb |
| Output Type |
relay |
| Output |
1 SPST |
| Reset Ratio |
1:1.5 reset ratio |
| Voltage |
120 Vac or 240 Vac |
| Frequency |
50 Hz, 60 Hz |
| Color |
Gray |
| Contact Ratings (120 Vac) |
8.0 AFL, 48.0 ALR |
| Contact Ratings (240 Vac) |
5.1 AFL, 30.6 ALR |
| Dimensions (in.) |
5 5/8 in. high x 2 in. wide x 2 1/8
in. deep |
| Dimensions (mm) |
143 mm high x 51 mm wide x 57 mm deep |
| Sensor Element |
Indoor and outdoor copper bulb |
| Number of Sensor Inputs |
2 |
| Capillary Length (ft) |
Indoor: 10 ft., Outdoor: 30 ft. |
| Capillary Length (m) |
Indoor: 3 m, Outdoor: 9.1 m |
| Bulb Size (in.) |
indoor: 3/8 in. diameter x 3 9/16
long; outdoor: 3/8 in. diameter x 5 5/16 in. long |
| Bulb Size (mm) |
indoor: 9.5 mm diameter x 90 mm long;
outdoor: 9.5 mm diameter x 135 mm long |
| Setpoint Temperature Range (F) |
70 F to 140 F |
| Setpoint Temperature Range (C) |
21 C to 60 C |
| Differential Temperature (F) |
6 F to 20 F |
| Differential Temperature (C) |
3 C to 11 C |
| Includes |
34886A Outdoor Bulb Guard, 121371P
Immersion Well Assembly |
| Comments |
1:1.5 reset ratio |
| Tradeline Value |
Tradeline |
| Approvals, Underwriters
Laboratories Inc |
Listed: E4436, vol. 4, Guide XAPX |
