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

1

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.

2

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

3

INSTALLATION

INSTRUCTION

INSTALLATION INSTRUCTIONS FOR

560199

ECONOMIZER USED WITH

(B4,B5)SM 090/120 SERIES AIR HANDLER

Heat Pump Ther mo stat – Sin gle "O/B" ter mi nal for
se lec tion of Re vers ing Valve Con trol.

(B4,B5)SM Series economizers are pre-wired to work in
conjunction with single stage Heat Pump thermostats that
utilize the "O" terminal to energize the reversing valve
when the thermostat "System Switch" is set in the "Cool"
mode. Refer to these installation instructions and wiring
diagrams for proper connection and operation of the
economizer. When the system switch is in the OFF, HEAT,
or EMERGENCY HEAT mode setting the economizer is
automatically locked out during heating operation. It holds
the outdoor fresh air damper at the minimum position
setting only when the air handler is operating. Refer to

Section VI – Minimum Damper Position for proper set
up and operation.

VI - SYS TEM CHECK AND START UP

PRO CE DURES

Min i mum Damper Po si tion Ad just ment.

Damper min i mum po si tion keeps the out door air damper
from clos ing com pletely dur ing sys tem op er a tion for
ven ti la tion of build ing con tam i nants and peo ple
oc cu pancy. Con sult your State or lo cal codes as required.

1. Disconnect main power to outdoor unit and air
handler.

2. Set thermostat "SYSTEM" switch to "OFF" position and
"FAN" switch to "AUTO".

3. Install jumper wire across air handler low voltage
terminal board "R" and "G" terminal.

4. Disconnect mixed air sensor from the W7212
terminals T and T1 and short terminals T and T1. See
Figure 5.

5. Ensure the factory installed jumper is in place across
terminals P and P1.

6. Calculate the appropriate mixed air temperature per
the following equation:

* (Return Air Temp. x % of Return Air) + (Outside Air

Temp. x % of Outside Air) = Mixed Air Temperature

Example:

Assume local code requires 10% outdoor air during
occupied conditions, (200 CFM of total unit CFM =
2,000) outdoor air is 60oF, and return air is 75oF.
Under these conditions, what is the mixed air
temperature?

10. Remove jumper wire across "R" and "G" on the low
voltage terminal board and T and T1 on the W7212
control module.

11. Reconnect the mixed air sensor.

12. Restore power to outdoor unit and air handler.

VII - MAIN TE NANCE

1. Damper motor is prelubricated and does not require
further lubrication.

2. Make visual inspection of dampers and linkage
assemblies during routine maintenance.

3. Filters should be checked periodically and cleaned
when necessary.

4. The washable filters supplied with the economizer can
be cleaned with water and a mild detergent.

5. Take note of “Air Flow Direction” marking on filter
frame when reinstalling.

6. If filter must be replaced, filter of like kind and size must
be used. DO NOT replace permanent filters with
throwaway type filters.

(0.1 x 60oF) + (0.9 x 75oF) = 6.0oF + 67.5oF = 73.5 oF

7. Restore power to the outdoor section and air handler.

8. Carefully adjust the MIN POS potentiometer on the
W7212 control module with a small screwdriver until
the mixed air temperature reaches the calculated
value.

9. Once minimum position adjustments are completed,
turn off power to the outdoor unit and air handler.
Damper will move to fully close.

4

Date: February 4, 2011

560199

Su per sedes:

Drawn by:

Unit #: 47-374-01

Di a gram#: 4737401w

Ap proved by:

Re vi sion Change Date

WIRE COLOR CODE

BLK Black BLU Blue

BRN Brown GRN Green

GRY Gray ORN Orange

RED Red VIO Violet

YEL Yellow WHT White

COMPONENT CODE

Modulating Economizer

(B4,B5)SM 090/120 Series Air Handler

Economizer

C7400A Fresh Air Enthalpy Sensor

C7150 Mixed Air Sensor

MS7510A Damper Actuator 24v

W7212A Logic Module

HARNESS DETAIL

E# = WIRE END DESIGNATION

E2 STUD #6 18 Ga. Wire

E3 Female ¼ Quick Disc.

E4 Male ¼ Quick Disc. Insul

E6 Wire Nut Size 73B

TB-11 Terminal Block

economizer.

simultaneous operation of the economizer and refrigerant system. Connect Y2 from 2 stage thermostat to

BLUE wire from economizer.

economizer (optional) in the heat pump Heating mode. CONNECT TO "R" FOR AC ONLY APPLICATIONS.

1. C & W2 to be connected to optional electric heat.

2. Remove BLACK wire from air handler low voltage terminal board Y terminal and connect to YELLOW wire from

3. Second Stage refrigerant cooling with optional economizer installed. A 2 stage thermostat is required for

4. Heat Pump Economizer Relay. For heat pump applications only. Required for proper operation of an

Date: February 4, 2011

560199

Su per sedes:

Drawn by:

Unit #: 47-374-01

Di a gram#: 4737402w

Ap proved by:

Re vi sion Change Date

WIRE COLOR CODE

BLK Black BLU Blue

BRN Brown GRN Green

ORN Orange RED Red

VIO Violet YEL Yellow

WHT White

COMPONENT CODE

Modulating Economizer

(B4,B5)SM 090/120 Series Air Handler

Economizer

C7400A Fresh Air Enthalpy Sensor

C7150 Mixed Air Sensor

MS7510A Damper Actuator 24v

W7212A Logic Module

HARNESS DETAIL

E# = WIRE END DESIGNATION

E2 STUD #6 18 Ga. Wire

E3 Female ¼ Quick Disc.

E4 Male ¼ Quick Disc. Insul

E6 Wire Nut Size 73B

TB-11 Terminal Block

1. Jumper be tween W2 and E is re quired.

2. C & W2 to be con nected to elec tric heat.

3. Re move BLACK wire from air han dler low volt age ter mi nal board Y ter mi nal and con nect to YEL LOW wire from

economizer.

si mul ta neous op er a tion of the economizer and re frig er ant sys tem. Con nect Y2 from 2 stage ther mo stat to

BLUE wire from economizer.

4. Sec ond Stage re frig er ant cool ing with op tional economizer in stalled. A 2 stage ther mo stat is re quired for

5. Heat Pump Economizer Re lay. Re quired for proper op er a tion of an economizer (optional) in the heat pump

Heating mode. Refer to economizer installation instruction for proper connection to thermostat.

7

FEBRUARY 4, 2011

8

NEIMB01