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GUIDE SPECIFICATIONS — SIZES 036-150 (cont)
* 13. High-Static Motor and Drive (036-120 3-phase units
only):
High static motor and drive shall be factory-installed
to provide additional performance range.
14. Condenser Coil Grille:
The grille protects the condenser coil from damage
by large objects without increasing unit clearances.
* 15. Compressor Cycle Delay:
Unit shall be prevented from restarting for a mini-
mum of 5 minutes after shutdown.
16. Fan/Filter Status Switch:
Provides status of evaporator fan (ON/OFF) or
indoor-air filter (CLEAN/DIRTY). Status shall be dis-
played with an indicator light at the thermostat.
* 17. Unit-Mounted, Non-Fused Disconnect Switch:
Shall be factory-installed, internally mounted, NEC
and UL approved non-fused switch shall provide unit
power shutoff. Shall be accessible from outside the
unit and shall provide power off lockout capability.
(Cannot be used with units rated over 80 amps.)
* 18. Convenience Outlet:
Shall be factory-installed and internally mounted with
easily accessible 115-v female receptacle. Shall
include 15 amp GFI receptacle with independent
fuse protection. Voltage required to operate conve-
nience outlet shall be provided by a factory-installed
step-down transformer. Shall be accessible from out-
side the unit.
19. EconoMi$er and Power Exhaust:
EconoMi$er shall utilize a microprocessor based
control and a gear driven damper system.
EconoMi$er shall provide controls and spring return
on power loss. The system shall exhaust up to 100%
of the return air (vertical applications only).
20. Power Exhaust for Accessory EconoMi$er:
Two two-stage power exhaust shall be used in con-
junction with EconoMi$er to provide the system with
the capability to exhaust up to 100% of return air.
The power exhaust is a field-installed accessory for
vertical and horizontal applications.
* 21. Dehumidification Package (551B Only):
The dehumidification package is a factory-installed
option that provides increased dehumidification by
further subcooling the hot liquid refrigerant leaving
the condenser coil. The package consists of a
subcooling coil located on the leaving-air side of the
evaporator coil. The location of this coil in the indoor
airstream greatly enhances the latent capacity of the
551B units.
The package shall be equipped with crankcase
heater(s), low pressure switch(es), and TXV(s). Low
pressure switch(es) prevents evaporator coil freeze
up and TXV(s) assure a positive superheat condi-
tion. If the operation of the subcooling coil is con-
trolled by a field-installed, wall-mounted humidistat,
the dehumidification circuit will then operate only
when needed. Optional field connections for the
humidistat are made in the low voltage compartment
of the unit control box.
22. Light-Commercial Thermidistat:
Field-installed, wall mounted thermidistat is used to
control temperature and activation of Perfect Humid-
ity™ package. The thermidistat can be set for humid-
ity settings from 50% to 90% relative humidity.
23. Hinged Panel Option (551B only):
Shall be equipped with hinged access panels for the
filter, compressor, evaporator fan, and control box
areas. Filter hinged access panels permit tool-less
entry for changing filters. Each hinged access panel
is permanently attached to the rooftop unit.
24. Outdoor-Air Enthalpy Sensor:
The outdoor air enthalpy sensor shall be used with
the EconoMi$er device to provide single enthalpy
control. When used in conjunction with a return air
enthalpy sensor, the EconoMi$er device will provide
differential enthalpy control. The sensor allows the
EconoMi$er controller to determine if outside air is
suitable for free cooling.
25. Return-Air Enthalpy Sensor:
The return air enthalpy sensor shall be used with the
EconoMi$er device. When used in conjunction with
an outdoor air enthalpy sensor, the EconoMi$er
device will provide differential enthalpy control.
26. Return-Air Temperature Sensor:
The return-air temperature sensor shall be used with
the EconoMi$er device. When used in conjunction
with an outdoor-air temperature sensor, the
EconoMi$er device will provide differential tempera-
ture control.
27. Indoor-Air Quality (CO
2
) Sensor:
Shall have the ability to provide demand ventilation
indoor-air quality (IAQ) control through the
EconoMi$er with an IAQ sensor.
The IAQ sensor shall be available in duct mount, wall
mount and wall mount with LED display. The set
point shall have adjustment capability.
50TFQ004-012
558F/551B036-150