AMX ViewStat - Manual (Page 65)

Operating the Thermostat
59 ViewStat Communicating Thermostat
Operating The Thermostat
Notes on temperature adjustments:
The COOL setting must always be a minimum of 2° (F or C) higher than the HEAT setting. The
thermostat will automatically maintain the 2° difference. For example, if the Cooling set point is
75°F and one changes the Heating set point to 74°F, the thermostat will automatically change the
Cooling set point to 76°F.
The lockout icon will appear on the display when attempting to make a change, if the thermostat
has been configured to be locked out or the desired change violates the thermostat limits (i.e. lowest
allowable HEAT setting is 40°F, highest allowable COOL setting is 90°F, etc.). Lockout
configuration can be altered in set-up menu (see the Thermostat Button Lockout section on
page 40).
Selecting the Mode
The thermostat can be set to OFF, COOL, HEAT or COOL (auto-changeover), EM. HEAT (for heat pumps
only), and HEAT modes. To set, press the Mode button until the desired mode appears on the display
(FIG. 42).
The following table describes each of the modes:
FIG. 42 Mode messages
• OFF Select the OFF mode to prevent the heating and cooling equipment
from operating.
• COOL COOL appears on the display and only the cooling equipment will be
operated to maintain the temperature at the COOL setting. COOL
will flash on the main display when the cooling equipment is
operating.
• HEAT HEAT appears on the display and only the heating equipment will be
operated to maintain the temperature at the HEAT setting. HEAT will
flash on the main display when the heating equipment is operating.
• AUTO (heat or cool
auto-changeover)
HEAT or COOL appears on the display. Either the heating or cooling
equipment will operate to maintain the room temperature at or above
the HEAT setting and at or below the COOL setting. HEAT or COOL
will flash when the respective equipment is operating.
• EMERGENCY HEAT
(EM. HEAT for heat pump
equipment only)
EM. HEAT appears on the display and only the back-up heat source
will be operated to maintain the room temperature above the HEAT
setting. This is generally more expensive than using the heat pump
(HEAT MODE), so use accordingly. Typical usage is when the heat
pump has malfunctioned.
Off Cool
Heat or Cool Emergency Heat
Heat
HEAT COOL EM. HEAT
HEAT