Two-Pipe Thermostat, Model TF103 Ð This single- pole, double-throw (SPDT) thermostat has snap-action con- tacts. The standard temperature range is 60 - 90 F.
Four-Pipe Thermostat, Model TH104 Ð With this thermostat, heating and cooling are sequenced (automatic changeover) with 6 degree separation between HEATING ON and COOLING ON. The standard temperature range is 60 - 90 F.
Thermostat Electrical Data
(Pilot Duty Ð 125 VA at 120-277 v)
ITEM | VOLTS | FLA | LRA |
TF103 | 120 | 16 | 80 |
and | 240 | 12 | 60 |
TH104 | 277 | 10 | 50 |
Automatic Changeover (Summer-Winter Switch) Ð The automatic-changeover thermostat is a single-pole double- throw (SPDT) thermal switch in a moistureproof and dust- proof enclosure. Thermostat mechanism and lead ends are hermetically sealed in a polypropylene enclosure with ep- oxy resin. Device clamps on coil supply pipe with end snap-on clip.
The set point temperatures are factory set. When water temperature rises above 80 F (approximately), the thermo- stat switches to the winter cycle. When water temperature drops below approximately 70 F, the thermostat switches to the summer cycle. Switch reset is automatic.
