Reznor B5SM Installation Manual
INSTALLATION INSTRUCTIONS FOR
INSTALLATION
(B4,B5)SM 090/120 SERIES AIR HANDLER
INSTRUCTION
I - Ship ping and Pack ing List
Pack age 1 of 1 con tains:
1 - Economizer As sem bly
1 - Con trols and Wir ing Har ness As sem bly
3 - Wire Nuts
14 - #10 x ½
Check contents for shipping damage. Contact the last carrier
immediately if any shipping damage is found.
II - Ap pli ca tion
Economizers are used with Nordyne (B4,B5)SM Series Air
Handlers for automatic sensor-controlled introduction of
outdoor air into the system through an electro-mechanically
controlled damper. Outdoor air is mixed with the buildings return
air to economically improve indoor air quality and aide in
reducing energy costs.
Economizers can be utilized in either Horizontal or Vertical air
handler applications and are easily mounted over the air
handler return air and filter frame assembly, The C-7150 Mixed
Air Sensor is shipped inside the economizer and must be
relocated downstream of the air handler refrigerant coil in
accordance with these instructions.
560199
ECONOMIZER USED WITH
FORM # 572D-1210
OUTDOOR FRESH AIR
INDOOR RETURN AIR INLET
ENTHALPY SENSOR
Economizer Sup ply / Re turn Duct Con nec tions:
39.75" Wide x 15.63" High (Outside Flange Dimensions)
Warn ing:
This kit is to be installed by a qualified service
technician in accordance with these instructions and
all codes having jurisdiction. Failure to follow these
instructions could result in serious injury, property
damage, or death. These instructions are primarily
intended to assist qualified individuals experienced in
the proper installation of this appliance. Some local
codes require licensed installation/service personnel
for this type of equipment.
III - In stal la tion
1. DISCONNECT ALL POWER TO THE UNIT.
2. Install and secure the economizer as shown with the air
handler in the Horizontal position (Figure 1) or in the
Vertical position (Figure 2) using screws (12) provided in
the kit.
NOTE: Economizers must be properly supported when
installed with this air handler. Support for the
economizer is field supplied and the responsibility of
the installer to use methods approved by State or Local
mechanical building codes having jurisdiction. For
Vertical installations, Nordyne Adjustable Support Leg
Kit , SKU # 560258 may be used.
DRIVE MOTOR
W7212 LOGIC MODULE
ELECTRICAL KNOCKOUTS
3. Connect ductwork to the economizer using flanges
provided.
Fig ure 1 - (B4,B5)SM Horizontal Application
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INSTALLATION
(B4,B5)SM 090/120 SERIES AIR HANDLER
INSTRUCTION
4 Remove the economizer control access panel, the air
handler motor access panel, and the air handler control
panel cover.
5 Remove the electrical knockout on the economizer
next to the damper motor and the plastic plug on the air
handler panel above the control panel, This will allow
routing of the economizer control wiring through a
length of 1" conduit, or other equivalent means of wire
protection based on State or Local codes which covers
24V Class 2 wiring.
6 Cut and discard wire tie securing control wiring bundle
inside the economizer. Remove the two red wires from
the C-7150 Mixed Air Sensor and mount the sensor to
the divider plate located left of the blower motor
assembly as shown in Figure 3 using two screws
provided.
Important - DO NOT cut other wires. Inspect bundle for
damaged connections or loose wires.
7. Route the nine economizer control wires from the
economizer quick connect plug through the conduit
and into the air handler compartment. Route all wires
except for the two red Mixed Air Sensor wires into the
control panel through the Low Voltage bushing.
8. Connect the two red wires to the Mixed Air Sensor and
secure wires away from the blower and motor
components.
9. Nordyne air handlers are designed to work with either
A/C or Heat Pump outdoor units. Select the proper
wiring diagram for this application on Page 5 and 6 to
connect the remaining seven economizer control wires
to the air handler.
INSTALLATION INSTRUCTIONS FOR
560199
ECONOMIZER USED WITH
ELECTRICAL
KNOCKOUTS
MOTOR ACCESS PANEL
Fig ure 2 - (B4,B5)SM Vertical Application*
CONTROL PANEL
Replace air handler control panel cover and motor access
panel.
IV - Op er a tion
Note: These instructions are written for the economizer
to operate with a standard single stage Heat/Cool or
Heat Pump thermostat. If 2nd stage mechanical
(compressor) cooling is desired a 2 Stage Cool / 1
Stage Heat thermostat is required.
A. Cool ing Mode, Se quence of Op er a tion (Stan dard)
1. On a call for cooling, with ambient temperature and
humidity above enthalpy control setpoint, the
refrigerant system will operate normally, and damper
will open to minimum vent position. See Section VI for
proper set up and adjustments.
2. On a call for cooling, with outdoor ambient temperature
and humidity suitable for cooling, enthalpy control will
shift stage one cooling control to outside air. The
economizer damper will modulate, mixing outside air
with return air, to control supply air temperature to
approximately 55°F (13°C). If additional cooling is
required, the compressor can be energized through
second stage of an optional two stage Cooling
thermostat. Refer to wiring diagrams for proper
connections.
* Air handler shipped from factory for horizontal application. See air handler installation instructions for
conversion from horizontal to vertical application.
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Fig ure 3 - Mixed Air Sensor Location
MIXED AIR SENSOR
INSTALLATION
INSTRUCTION
INSTALLATION INSTRUCTIONS FOR
560199
ECONOMIZER USED WITH
(B4,B5)SM 090/120 SERIES AIR HANDLER
B. Cool ing Mode, Sin gle Enthalpy Con trol
(Fac tory Stan dard)
The C7400A enthalpy control senses both
temperature and humidity or the heat content of
the outside air. It controls the amount of outdoor
air brought into the system. When the heat
content of the outside air is below control
setpoint, the control modulates outdoor dampers
to meet cooling needs of the building. When the
heat content rises above control setpoint, the
control closes outdoor dampers to minimum
position. The recommended setpoint is “A”. If
Economizer is allowing air which is too warm or
too humid to enter the system, control may be
changed to a lower setpoint (B, C, or D). Refer to
Figure 4 and Figure 5.
C. Heat ing Mode (Heat Pump Ap pli ca tion
ONLY)
1. On a call for heat the fresh air damper will
open to the minimum vent position.
V - Economizer Set Up Pro ce dures
Notice to Installer: Proper operation of this
economizer when used with an outdoor HEAT
PUMP system is dependent on the type
thermostat installed with the unit. Identify which
type thermostat is connected to unit before
making any wiring changes if needed.
Figure 4
Fig ure 5
(B4,B5)SM air handler economizers come equipped with Honeywell
W7212 logic modules which offer additional connections for Demand
Control Ventilation (DCV) and Power Exhaust. Contact your local
Honeywell or Tradeline representative for additional information on
these controls and their specific applications
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