Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8
8
The
electric heat control (heat pump only)
allows the user to select whether the
electric heat operates simultaneously with the compressor. The units are wired at the
factory for simultaneous operation. For non-simultaneous operation, a wire is moved
from one terminal to another in the control box.
The
electric heat during defrost (heat pump only)
allows the user to select
whether electric heat operates when the heat pump enters into the defrost mode.
The units are wired at the factory to prevent the electric heaters from operating
during the defrost mode. For operation during defrost, a wire is moved from one
terminal to another in the control box. NOTE: for operation of the electric heat during
defrost, the electric heat control must be configured to allow simultaneous operation
of the electric heat and the compressor.
D.
The motorized fresh air damper with PowerVent and GreenWheel®
ERV
ventilation options are equipped with a
fresh air fan speed control
. The fresh air
fan speed control controls both the ventilation intake and exhaust blowers together,
automatically balancing the intake and exhaust cfm up to 450 cfm. An optional fan
speed control allows independent operation of the intake and exhaust air blowers.
IMPORTANT
MINIMUM AIR FLOW IS REQUIRED FOR PROPER OPERATION.
1.04A THERMOSTATS AND SUB-BASES
A. Thermostats for Air Conditioners and Heat Pumps with two stages heating.
1.
Digital, 7 day, 5-2 and 5-1-1 day programmable thermostat
. Two stage heat/
Two stage cool. Manual or auto changeover. Fan: Auto & On. Permanent
retention of setting on power loss. Field adjustable temperature calibration.
Adjustable max. setpoint for heating and min. adjustable setpoints for cooling.
Adjustable temperature differential. Keypad lockout. Status LED. °F or °C
selectable. Title 24 compliant. For use with models VAIA and VAISA. Marvair P/N
50107.
2.
Digital, 7 day, 2 occupied & 2 unoccupied periods for each day of the week
programmable thermostat
. Three stage heat/Three stage cool. Manual or auto
changeover. Fan: Auto & On. Ten year retention of programming settings and 48
hour clock and day settings on power loss. Adjustable max. setpoint for heating
and min. adjustable setpoints for cooling. Adjustable temperature differential.
Keypad lockout. Status LED. °F or °C selectable. Optional remote sensors for
outdoor air, supply air and humidity. Title 24 compliant. For use with models VAIA
and VAISA. Marvair P/N 50248.
3.
Digital, non-programmable thermostat.
Two stage heat/Two stage cool.
Manual or auto changeover. Fan: Auto & On. Permanent retention of setting on
power loss. Field adjustable temperature calibration. Adjustable max. setpoint
for heating and min. adjustable setpoints for cooling. Adjustable temperature
differential. Keypad lockout. Status LED. °F or °C selectable. For use with models
VAIA and VAISA. Marvair P/N 50252.
4.
MAR7000 thermostat.
See Product Data Sheet for complete description.
