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GUIDE SPECIFICATIONS • MQL
27
H. Special Features:
The following unit options shall be available.
1.0 Fan Section:
a. Variable frequency drives.
b. Motor starters – contactor with overload for three phase and contactor for single phase.
c. High-efficiency motors (inverter-duty).
d. Totally enclosed fan cooled (TEFC) motors (inverter-duty).
e. Two-speed motors.
f. Direct drive plug fans with internal isolation.
g. Class II forward curved fans with regreasable pillow block bearings.
h. Exhaust or return fans for use with economizer sections.
2.0 Coil Section:
a. Chilled water coil with copper plate fins and/or stainless steel casing.
b. Direct-expansion coil with copper plate fins and/or stainless steel casing.
c. Hot water coil with copper plate fins and/or stainless steel casing.
d. Steam distributing coil with copper plate fins and/or stainless steel casing.
3.0 Filtration:
a. 4” pleated filter type (standard size), 60-65% efficiency (MERV-11)
b. 4” pleated filter type (standard size), 80-85% efficiency (MERV-13)
c. 4” pleated filter type (standard size), 90-95% efficiency (MERV-14)
4.0 Access Doors: Hinged (lift-off type) doors with quick-action latches (handles) on both sides of the section
for access to both the fan and filter from either side of the unit.
5.0 Base Rail: Unit mounted base rail shall be a minimum of 4” in height and constructed of galvanized
steel, structurally capable of supporting unit on floor or by ceiling suspension.
I. End Devices:
The following guide specifications should be used as a basis for design when using optional factory/field-
mounted direct digital controls. These specifications should be reviewed to match the specific system control
requirements and available control packages.
1.0 The electrical components shall be recognized by UL. The unit shall be in compliance with the UL 1995
standards. Fan motors are wired and terminated in the control enclosure.
2.0 All application software performing the required control functions shall be field-supplied with the DDC
controller factory or field mounted and wired (tested and configured).
3.0 Available End Devices and Controls:
a. Variable Frequency Drives
• Factory supplied and mounted
• Field supplied and factory mounted
b. Motor Starters
• Factory supplied and mounted
• Field supplied and factory mounted
c. End Devices (factory supplied and mounted)
• Disconnect switch (fused or non-fused)
• Damper actuator (modulating from 100% OA to 100% RA)
• Fuses, relays, transformers, etc.
• Electric heat interlock relay
• Hand off auto switch
ENVIRO-TEC