ECONOMIZER DOWN DISCHARGE / SUPPLY KIT - Modu-
lating integrated economizer provides simultaneous opera-
tion between the mechanical cooling and economizer
operation. Independent blade design insures proper control
and less than 1% leak rate. Includes hood and mesh bird
screen filter integrated into the hood, dry bulb sensor and re-
lief damper. Separate field accessories of single enthalpy and
dual enthalpy are also available.
SINGLE ENTHALPY SENSOR - Sensor replaces dry bulb
sensor standard in economizer kit. Provides improved econo-
mizer operation by sensing the dry bulb temperature from out-
doors plus the enthalpy content of the outdoor air.
DUAL ENTHALPY SENSOR - Additional sensor to single en-
thalpy sensor. Sensor senses both the return air temperature
dry bulb and humidity in conjunction with the single enthalpy
to determine the most economical mix. Single Enthalpy sen-
sor also required.
UPGRADE PRESSURE PACKAGE - Contains screw in type
High pressure, Low Pressure/Loss of Charge switch, freeze
protection switch and lockout relay. Switches are placed onto
existing schrader ports located in the unit by furnished adapt-
ers. When abnormal conditions are sensed through the pres-
sure switches, the unit will lock out preventing any further
operation until reset or problem is corrected. Package agency
approved.
HAIL GUARD KIT - Kit contains protected grilles made of ex-
panded aluminum grilles with full perimeter
1
1
2
inch frame.
Sloped hoods are also included to assure maximum protec-
tion.
FILTER / FRAME KIT (Single Phase only) - Kit contains the
necessary hardware to field install return air filters into the
base unit. Pre-cut filter racks and appropriate cleanable stan-
dard size filters are shipped in one kit. (1" filter is supplied)
This kit is available for single phase horizontal or vertical duct
application only. Standard in all 3 Phase models.
MOTORIZED FRESH AIR DAMPER - Designed for duct
mounted side supply/return and unit mounted down sup-
ply/return applications. Damper capable of providing 0% thru
50% of outdoor air (field supplied). Closes on power loss, in-
cludes hood and screen assembly.
RECTANGLE TO ROUND ADAPTERS - Kit includes one sup-
ply and one return air rectangle to round duct adapter. Adapters
are preformed and designed to fit over current duct openings on
the base unit. Transition is from 15" square to 14" round.
ROOF CURBS - NRCA approved curbs provide proper fit to
base unit for rooftop installations. Curbs are designed to be
assembled through hinge pins in each corner. Kit also pro-
vides seal strip to assure a water tight seal. 8 and 14 inch high
roof curbs are available.
MANUAL OUTDOOR DAMPER - Provides 0% thru 50% out-
door air capability (field adjustable). Designed for duct
mounted side supply/return applications. Includes hood and
screen assembly.
WALL THERMOSTAT - The units are designed to operate
with 24-volt electronic and electro-mechanical thermostats.
All units can operate with single stage heat / single stage cool
thermostats - with or without the economizer.
TRANSFORMER KIT (Single Phase only) - Kit provides
necessary hardware to provide single phase models from fac-
tory furnished 40 VA transformer capability to 75 VA trans-
former capability.
ELECTRIC HEATERS - Each heater package provides easy
installation of electric heat strips. Slide in design with plug in
harness and agency approved. Heaters are available from
5.0 KW sizes and are designed for single and dual point con-
nections.
036-21311-003-A-0104
Unitary Products Group
3
FIELD-INSTALLED ACCESSORIES
TABLE OF CONTENTS
Description .........................................................................1
Features and Benefits .................................................1 & 2
Field-installed Accessories ................................................3
Ratings...............................................................................4
Physical Data .....................................................................4
Cooling Capacities - BHA018 ............................................5
Cooling Capacities - BHA024 ............................................6
Cooling Capacities - BHA030 ............................................7
Cooling Capacities - BHA036 ............................................8
Cooling Capacities - BHA042 ............................................9
Cooling Capacities - BHA048 ..........................................10
Cooling Capacities - BHA060...........................................11
Heating Capacities - BHA018 & 024 ................................12
Heating Capacities - BHA030 & 036 ................................13
Heating Capacities - BHA042 & 048 ................................14
Heating Capacities - BHA060 ..........................................15
Application Data ...............................................................15
Additional Static Pressure Resistance .............................15
Side and Bottom Supply Air Blower Performance ...........16
Field Wiring Diagram .......................................................17
Electrical Data (basic unit) ...............................................17
Electrical Data (cooling / electric heat).............................18
Unit Dimensions ...............................................................20
Center of Gravity ..............................................................21
Clearances.......................................................................21
Typical Applications .........................................................22
Roof Curb Dimensions .....................................................23
Roof Curb Application ......................................................23
Typical Wiring Diagram (208/230-1-60) ...........................24
Typical Wiring Diagram (208/230-3-60) ...........................25
Typical Wiring Diagram (460-3-60 & 575-3-60) ...............26
Typical Wiring Diagram Notes..........................................27
Typical Wiring Diagram Legend .......................................27
Mechanical Specification .........................................28 & 29
