Honeywell Design and Application User Manual

Section 3 - Types of Analog Economizers
39 Honeywell Economizers 63-8594-02
Transformer Wiring Requirements for Analog Economizers
Economizer Panel Supplied With Same Transformer As Cooling Commercial Thermostat.
One of the most common misapplications of
economizers is related to the field wiring.
When the economizer will not open the
dampers and it is really cool outside, check
the wiring with the transformers. In analog
economizers relay coil 1S is used to open the
outside air dampers as the first stage of free
cooling. To function properly 1S had to be
wired to both sides of the same transformer.
When the same transformer was used for
supplying the commercial thermostat, cooling
relay and the economizer logic module the
switching occured correctly.
Economizer Panel Supplied With Separate Transformer From Cooling Commercial Thermostat.
24 Vac is supplied to the relay coil 1S in this
application from two separate transformers.
Though the first stage of cooling will switch
correctly through the economizer module
circuit, the relay coil 1S may not. Honeywell
recommends use of a single, larger
transformer for both the economizer logic
module and the cooling commercial
thermostat circuit.
1
2
1K
1S
1S SWITCHES
WHEN POWERED
BY 24 VOLTS
1S1
TR TR1
ECONOMIZER LOGIC PANEL
W7459, W6210, W6215,
W7210, W7215, W7460
THIS SWITCH
ENERGIZES THE
MIXED AIR CIRCUIT
M13822A
RELAY COIL FOR
FIRST STAGE
OF COOLING
CONTACT FOR
COOLING IN
COMMERCIAL
THERMOSTAT
PRIMARY
VOLTAGE
1
2
1K
1S
1S SWITCHES
WHEN POWERED
BY 24 VOLTS
1S1
TR TR1
ECONOMIZER LOGIC PANEL
W7459, W6210, W6215,
W7210, W7215, W7460
THIS SWITCH
ENERGIZES THE
MIXED AIR CIRCUIT
M13823A
RELAY COIL FOR
FIRST STAGE
OF COOLING
CONTACT FOR
COOLING IN
COMMERCIAL
THERMOSTAT
PRIMARY
VOLTAGE
PRIMARY
VOLTAGE

Honeywell Design and Application Specifications

General

Brand	Honeywell
Model	Design and Application
Category	Controller
Language	English