Carrier 42 SERIES - Manual (Page 13)

Two-Pipe Thermostat, Model TF103 — 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 — 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 — 125 VA at 120-277 v)
ITEM VOLTS FLA LRA
TF103
and
TH104
120 16 80
240 12 60
277 10 50
Automatic Changeover (Summer-Winter Switch) —
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.
STEMCO
416-79
L80 8220
AUTOMATIC CHANGEOVER (Summer-Winter) SWITCH
13