4
Single-Duct and Retrofit Terminal Units IOM
MAINTENANCE
No periodic preventative maintenance required, unless
called for by specific control sequence.
CONTROL ARRANGEMENTS
The LMHS / LMHS-LC single duct and RVE / SVE retrofit
units are offered with a wide variety of factory-mounted
controls that regulate the volume of air delivery from the
unit and respond to cooling and heating load requirements
of the conditioned space. Stand-alone controls will fulfill
the thermal requirements of a given control space. These
devices are available in both pneumatic and electronic
arrangements. A number of DDC (Direct Digital Controls)
control packages by others are available for consignment
mounting, as indicated.
Each control approach offers a variety of operating functions;
a control package number identifies combinations of control
functions. The following listings contain the basic function
arrangements for each control offering. Because of the
variety of functions available, circuit diagrams, operating
sequences, and function descriptions are contained in
separate Application Data publications. Refer to the specific
control publication for details.
Direct Digital Electronic Control Arrangement (Field Supplied)
Control packages are field supplied for factory mounting,
unless otherwise noted. All DDC control arrangements
include an inlet flow sensor, 24V transformer (optional),
and control enclosure. Contact factory for details about
mounting field-supplied controls.
Analog Electronic Control Arrangement
Pressure independent control packages are available
without supplemental heat, with on/off hot water or
electric heat, proportional hot water heat, or with cooling/
heating automatic changeover control. All analog control
arrangements include an inlet flow sensor, 24V transformer
(optional), control enclosure, and wall thermostat with LCD
display.
2100: Heating control
2101: Cooling control
2102: Cooling with on/off electric heat control
2103: Cooling with on/off hot water heat control
2104: Cooling/heating automatic changeover control
2105: Cooling with proportional hot water heat control
2110: Cooling with solid state LineaHeat proportional heat control
2111: Cooling/heating with automatic change over with up
to 3 stages of electric heat control
2113: Cooling/heating with automatic change over with
solid state LineaHeat proportional heat
2115: Upstream static pressure monitoring
2116: Downstream static pressure monitoring
Pneumatic Control Arrangement
All control packages are pressure independent (unless
otherwise noted) and available with or without hot water
heat, dual maximum airflow, heating and cooling maximum
airflow and dual minimum airflow. All control arrangements
include a standard K4 LineaCross inlet flow sensor.
1100 (Actuator only): DA-NC Pressure dependent control
1101 (Actuator only): RA-NO Pressure dependent control
1102 (Single function controller): DA-NO with or without
1103 (Single function controller): RA-NC with or without
1104 (Multi-function controller): DA-NO with or without
1105 (Multi-function controller): DA-NC with or without hot
1106 (Multi-function controller): RA-NO with or without hot
1107 (Multi-function controller): RA-NC with or without hot
1108 (Dual Maximum Control): DA-NO with or without hot
1109 (Heating/Cooling Maximum Control): DA-NO with or
without hot water or electric heat
1110 (Dual Minimum Control): DA-NO with or without hot
1111 (Dual Minimum Control): RA-NO with or without hot
1112 (Heating/Cooling Maximum Control): RA-DO with or
without hot water or electric heat
Pneumatic Control Legend
• DA: Direct acting thermostat
• RA: Reverse acting thermostat
• NO: Normally open damper position
• NC: Normally closed damper position
• Single function controller: Provides single function, i.e.,
DA-NO
• Multi-function controller: Capable of providing DA-NO,
DA-NC, RA-NC or RA-NO functions.
No Control Arrangement
• 0000: Unit with no control box.
• D000: Unit with control enclosure and transformer.
• D001: Unit with control enclosure and no transformer.
Also used for control enclosure and electric heat.