EWC Controls BMPlus 3000 Technical Bulletin page 7

SYSTEM WIRING CONTINUED
Single
Typical 2 stage gas furnace with 2
Transformer
stage A/C. Constant or variable
Gas & A/C
speed systems can be connected
2 stage heat
and controlled. Choose Timer or
2 stage cool
Outside air to delay 2nd stage.
2 STAGE
2 STAGE GAS
OUTDOOR
FURNACE
CONDENSING
UNIT
Y2
Y1
R
C
NOTE: If desired, you can connect a "C" Common
wire back to the "System" terminal block. Use it as
a TEST point while troubleshooting.
NOTE: The "R" wire connection to the condensing
unit may not be required on your system.
Figure 11 Single transformer 2 Stage Heat & Cool system
Warning: All of the wiring diagrams provided are
general in nature and may not perfectly match your
particular application, due to differences in HVAC Mfr's
design and terminal designations and functions!
Variations on these diagrams and other System or
Thermostat applications are available by contacting the
EWC Technical Support Hotline.
ENHANCED FEATURES AND FUNCTIONS
MODULE TO MODULE FACTORY POWER WIRING
The BMPlus 3000 includes Factory Power
Wiring on all expanded systems. The 24 vac
power to the expansion modules is fed
through the bus cable. This simplifies your
wiring and minimizes the chances of reversing
polarity.
DUAL FUEL COMPATIBLE
The BMPlus 3000 is compatible with Dual Fuel
Heat Pumps. Dual Fuel kits are not required.
Select staging based on Adjustable Time
Delay or an Optional Outside Air temperature
Sensor. The intelligent firmware does the rest.
* OFF, 7 TO 42 MINUTE 2ND STAGE TIME DELAY SETTINGS
* 7 TO 42°F. OUTSIDE AIR CHANGEOVER
* HIGHEST LEVEL OF THERMOSTAT COMPATABILITY
* ADJUSTABLE DIFFERENTIAL LIMIT CONTROL
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362
BMPlus 3000
SYSTEM
G
G
Y2 Y2
Y1 Y1
W1 O
W2 W1/B
W2/E
R
RH
C
RC
C
RC/RH
LINK
HVAC system with OEM Voltage Control Circuitry
Some HVAC manufacturers are designing HVAC Systems
with 5 - 18 vdc control circuits. Standard 24 vac thermostats
will not work on these systems. These systems can only be
controlled with their own thermostat. But the SYSTEM
connections on a BMPlus 3000 are all dry contacts! Virtually
any HVAC low voltage control circuit can be connected and
controlled. All you have to do is ask the manufacturer which
numbered terminal corresponds to the standard terminals.
Theoretical diagram only shown below.
OEM
Geothermal
Heat Pump
5
4
3
2
1
THEORETICAL DIAGRAM!
CONTACT THE EQUIPMENT
MANUFACTURER FOR
TERMINAL DESIGNATIONS!
Figure 12 OEM system with 5 - 18 vdc control circuit.
SHORTED ZONE FEATURE FIRMWARE
The BMPlus 3000 Zone Control System
includes the Shorted Zone Feature. This
feature allows the BMPlus to ignore demands
from a zone thermostat that is putting out
simultaneous demands for heat & cool. A
condition most likely due to a short in the field
wiring, incorrect wiring, or a defective
thermostat. The BMPlus will honor any
legitimate demands from any other zone(s),
except the shorted zone. When the problem is
identified and repaired, the BMPlus 3000 will
automatically recognize that zone.
*SECOND STAGE 50% ZONE RULE SAVES ENERGY
* STATUS LED's ARE INCLUDED ON ALL MODULES
*1 ZONE MODE COMPLIES WITH CALIFORNIA TITLE 24
* SIMPLIFIED WIRING AND EASY SYSTEM SETUP
E-Mail- info@ewccontrols.com
BMPlus 3000
SYSTEM
G
Y2
Y1
O
W1/B
W2/E
RH
RC
C
RC/RH
LINK
7