Introduction 1
1.0 INTRODUCTION
1.1 System Descriptions
Himod environmental control systems are available in several main system configurations: Air
Cooled, Glycol Cooled, GLYCOOL, Dual Cool With Air and Dual Cool With Glycol. All types have a
single scroll compressor and are available in upflow and downflow configurations. The standard
upflow configuration is front return. All models require three-phase power. Units are available in 208,
230 and 460V, 3 phase, 60 Hz.
The following features are included as standard in all room units regardless of the type of system:
slab coil, 4" filter, individual high voltage fused protection, and fan assemblies. Units may be ordered
with or without a steam generating humidifier and with or without an electric reheat.
Each configuration can operate with either Advanced Microprocessor Controls (A) or Advanced Micro-
processor Controls with Graphics (G). A brief description of each, including operational differences, is
listed below. Check model numbers to see what is supplied with your unit.
1.1.1 System Types
Air Cooled Models
Complete refrigeration system including a hot gas bypass and crankcase heater with standard con-
denser and fan speed control for 95°F (35°C) ambient temperature at sea level.
Glycol Cooled Models
Complete refrigeration system including hot gas bypass, crankcase heater, glycol cooled condenser,
two-way fluid regulating valve with bypass, plus pump package and 95°F (35°C) design ambient dry-
cooler for installation with closed-loop piping arrangements/systems.
GLYCOOL Models
Complete refrigeration system including hot gas bypass, crankcase heater, with glycol condenser and
three-way fluid regulating valve plus an integrally piped Econ-O-Coil with three-way modulating con-
trol valve.
Dual Cool With Air
This system has all the features of an air cooled system but adds a second cooling coil that is con-
nected to a source of chilled water. This second coil is controlled by a modulating control valve. It is
the primary source of cooling and dehumidification so compressor operation is reduced.
Dual Cool With Glycol
This system has all the features of a glycol cooled system but adds a second cooling coil that is con-
nected to a source of chilled water. This second coil is controlled by a three-way modulating control
valve. It is the primary source of cooling and dehumidification so compressor operation is reduced.
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