Control Options - Greenheck IGX-HV Brochure & Specs

Heating and Ventilating control
Three heating and ventilating options are available to provide proper tempering and fulfill varying requirements for
fresh outdoor air. In all cases, heating and cooling functions are controlled by a Greenheck room thermostat or a
DDC system (by others).
HV1: 0%-30% Minimum outdoor air
HV1 is the most common among
heating and ventilating units, allowing
you to set the minimum outdoor air
volume between 0 and 30% of the total
supply air volume. With the relatively
low percentage of outdoor air, mixed
air temperatures are mild and stable.
1-stage heating and/or cooling is
recommended. (2-stage or electronic
modulation is optional).
Outdoor Air
0% - 30%
Return Air
70% - 100%
thermostat options
Basic bimetal thermostats with mercury switches or fully programmable electronic thermostats are available as
Outdoor Air
part of your IGX-HV system. Match your heating, cooling, staging, and operational requirements to the appropriate
30% - 75%
thermostat.
Return Air
25% - 100%
tc1: 1-stage Heating / cooling
TC1 is a coiled bimetal thermostat
used for single-stage heating, cooling
or heating-cooling systems.
Return Air
100%
tc2: 2-stage Heating
TC2 is a coiled bimetal
thermostat used for 2-stage
heating systems.
tc3: 2-stage Heating / 2-stage cooling
TC3 is a coiled bimetal
thermostat used for 2-stage
heating, cooling or heating-
cooling systems. It includes
an adjustable heat anticipator,
stops, and a locking cover.
HV2: 30%-75% Minimum outdoor air
The HV2 option is required when the minimum outdoor air volume
exceeds 30% of the total supply air volume. With higher outdoor air
volumes, mixed air temperatures
can vary greatly. Accordingly,
2-stage heating and/or cooling is
recommended. Also, an airstream
override thermostat is standard
with HV2 to prevent cold air
discharge (below 55˚ F) when the
thermostat is satisfied. (electronic
modulation is optional).
HV3: 100% return air
The HV3 option is available when no
outdoor air is needed. With relatively
stable return air conditions, 1-stage
heating and/or cooling is strongly
Supply
recommended. (2-stage or electronic
modulation is optional).
Supply
tc4: Programmable
TC4 has full seven-day program
capability. The thermostat can
be set for four times and eight
temperature settings each day of
the week. It can control up to two
stages of heating and two stages
Supply
of cooling.
tc5: deluxe Programmable
TC5 has full seven-day program
capability. The thermostat can
be set for two occupied and two
unoccupied times with adjustable
temperature settings for each day
of the week. It can control up to
three stages of heating and two
stages of cooling. The Intelligent Fan™ feature energizes the
fan continuously during occupied mode and intermittently
with a call for heating or cooling in unoccupied mode.

controL oPtIons

Outdoor Air
Outdoor Air
0% - 30%
0% - 30%
Return Air
Return Air
70% - 100%
70% - 100%
Outdoor Air
Outdoor Air
30% - 75%
30% - 75%
Return Air
Return Air
25% - 100%
25% - 100%
Return Air
Return Air
100%
100%
Supply
Supply
Supply
Supply
Supply
Supply
3