Marvair Scholar 2.0 I&S Manual 04/2022 Rev.2
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factory to allow simultaneous operation upon a call for electric heat from the system
thermostat. Electric heat will only operate:
1. Upon call from thermostat
2. When outdoor thermostat threshold is reached, if installed
3. Or during defrost when set to operate
For non-simultaneous operation, navigate to “Option Selection” screen and turn
off EHDD, then turn on S-CKT. Notice that EHDD is now “OFF” and S-CKT is now
“Selected”.
The
electric heat during defrost “EHDD” (heat pump only)
allows the user to
select whether electric heat operates when the heat pump enters into the defrost
mode. The units are set at the factory to allow for electric heat during defrost
(EHDD). For operation during defrost, go to “Option Selection” screen to turn on
EHDD and turn off S-CKT, S-CKT prevent the compressor and electric heat to
operate at the same time.
D. Motorized Fresh Air Damper with PowerVent and GreenCube
®
ERV
Ventilation options equipped with a
fresh air fan speed control
. The fresh air fan
speed control controls the ventilation exhaust fan, automatically balancing the intake
and exhaust cfm up to 450 cfm.The intake blower is controlled and can be adjusted
from the PLC on the control speed setting screen.
IMPORTANT
MINIMUM AIR FLOW IS REQUIRED FOR PROPER OPERATION.
1.04 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 Scholar 2.0
models. 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 Scholar 2.0
models. Marvair P/N 50252.
