protech HC-TST412MDMS Series User Manual

2
2 "AA" Batteries
Power
Stealing
Switches
Stack
Power
Stealing
Switch
WIRING CONNECTIONS
Refer to equipment manufacturers' instructions for specifi c
system wiring information. After wiring, see CONFIGURA-
TION section for proper thermostat confi guration.
WARNING
!
Thermostat installation and all components of the
control system shall conform to Class II circuits per
the NEC code.
INSTALLATION
Battery Location
2 "AA" alkaline batteries are included in the thermostat at the
factory with a battery tag to prevent power drainage. Remove
the battery tag to engage the batteries.
To replace batteries, set system to OFF, remove thermostat
from wall and install the batteries in the rear along the top of
the thermostat (see Figure 1).
Remove Old Thermostat
A standard heat/cool thermostat consists of three basic parts:
1. The cover, which may be either a snap-on or hinge type.
2. The base, which is removed by loosening all captive
screws.
3. The switching subbase, which is removed by unscrewing
the mounting screws that hold it on the wall or adapter
plate. Before removing wires from old thermostat,
label each wire with the terminal designation from
which it was attached. Disconnect the wires from the old
thermostat one at a time. Do not let wires fall back into
the wall.
Installing New Thermostat
1. Pull the thermostat body off the thermostat base. Forcing
or prying on the thermostat will cause damage to the unit.
2. Place base over hole in wall and mark mounting hole
locations on wall using base as a template.
3. Move base out of the way. Drill mounting holes. If you
are using existing mounting holes and the holes drilled
are too large and do not allow you to tighten base snug-
ly, use plastic screw anchors to secure the base.
4. Fasten base snugly to wall using mounting holes shown
in Figure 1 and two mounting screws. Leveling is for
appearance only and will not affect thermostat operation.
5. Connect wires to terminal block on base using
appropriate wiring schematic (see diagram sheet
37-6809).
6. Push excess wire into wall and plug hole with a fi re re-
sistant material (such as fi berglass insulation) to prevent
drafts from affecting thermostat operation.
7. Carefully line the thermostat up with the base and snap
into place.
TERMINAL DESIGNATION DESCRIPTIONS
Y2
B
Mounting
Hole
Mounting
Hole
Place Level
across
Mounting Tabs
(for appearance only)
Place Level
across
Mounting Tabs
(for appearance only)
+
S
-
L
W/E
6
V
HM
DHM
Figure 1 – (-)HC-TST412MDMS Base
Rear view of thermostat
For wiring diagrams, see next page.
Wiring diagrams shown are for typical systems and describe
the thermostat terminal functions.
Terminal Designation Description
B . . . . . . . . . . . . . . . . . . . Changeover valve for heat pump energized constantly in heating mode (default ON)
DHM . . . . . . . . . . . . . . . . . . De-humidifi cation Relay
Y2 . . . . . . . . . . . . . . . . . . . 2nd Stage Compressor
Y . . . . . . . . . . . . . . . . . . . Compressor Relay
G . . . . . . . . . . . . . . . . . . . Fan Relay
RC. . . . . . . . . . . . . . . . . . . Power for Cooling
RH. . . . . . . . . . . . . . . . . . . Power for Heating
C . . . . . . . . . . . . . . . . . . . Common wire from secondary side of cooling
V . . . . . . . . . . . . . . . . . . . PWM Output
6 . . . . . . . . . . . . . . . . . . . Powered closed 3rd wire for 3-wire Zone
W/E . . . . . . . . . . . . . . . . . . Heat Relay/Emergency Heat Relay (Stage 1)
HM . . . . . . . . . . . . . . . . . . Humidifi cation Relay
L . . . . . . . . . . . . . . . . . . . Compressor malfunction or Comfort Alert signal input
-. . . . . . . . . . . . . . . . . . . . Common (DC) for wired remote temperature sensor
S . . . . . . . . . . . . . . . . . . . Frequency signal from remote temperature sensor
+ . . . . . . . . . . . . . . . . . . . Power (DC) to remote temperature sensor

protech HC-TST412MDMS Series Specifications

General

Brand	protech
Model	HC-TST412MDMS Series
Category	Thermostat
Language	English