installation, operating and service instructions eva series boiler

43 

DOWN 

OPERATION AND SHUT 

SAFETY AND OPERATING CONTROLS. 

omponent 

C 

n 

Functio 

Circuit 

Control 

Breaker 

circuit 

the 

amps, 

5 

approximately 

exceeds 

circut 

control 

the 

draw of 

power 

the 

If 

reset. 

is 

breaker 

circuit 

until 

from operating 

boiler 

the 

prevents 

and 

trips 

breaker 

Switch 

Power 


the 

of 

circut 

control 

the 

to 

interrupted 

is 

power 

position, 

off 

the 

in 

is 

switch 

this 

If 

is 

power 

position, 

on 

the 

in 

is 

switch 

the 

If 

from operating. 


the 

prevents 

which 

circut. 

control 

the 

to 

supplied 

Aquastat 

Operating 

to 

interrupted 

is 

power 

point, 

set 

adjustable 

the 

exceeds 

temperature 

water 


the 

If 


the 

When 



the 

prevents 

which 


the 

of 

circut 

control 

the 

setting, 

differential 

adjustable 

the 

minus 

point 

set 

below the 

drops 

temperature 

water 

circut. 

control 

the 

to 

supplied 

again 

is 

power 

High 

Reset 

Manual 

Aquastat 

Limit 

to 

interrupted 

is 

power 

point, 

set 

adjustable 

the 

exceeds 

temperature 

water 


the 

If 

is 

Power 



the 

prevents 

which 


the 

of 

circut 

control 

the 

button. 

reset 

control's 

the 

pressing 

by 

reset 

manually 

is 

control 

the 

until 

interrupted 

circut. 

control 

the 

to 

supplied 

be 

again 

will 

power 

depressed, 

is 

button 

the 

When 

Flow Switch 

the 

move 

to 

required 

flow rate 

fixed 

below the 

drops 


the 

flow through 

water 

the 

If 

the 

to 

interrupted 

is 

power 

contacts, 

controls 

the 

close 

to 

enough 

paddle 

control's 

is 

flow rate 

water 

the 

When 



the 

prevents 

which 

circut, 

control 

control 

the 

to 

supplied 

is 

power 


contacts 

control's 

the 

closes 

paddle 

the 

increased, 

circut. 

(Safety) 

Pressure 

Valve 

Relief 

opens 

valve 

the 

, 

point 

set 

fixed 

the 

exceeds 

appliance 

the 

inside 

pressure 

the 

If 

inside 

pressure 

the 

until 

open 

remains 

valve 

The 

water. 

discharges 


mechanically 

point. 

set 

below the 

drops 

appliance 

the 

Link 

Fuseable 

Mixer 

contacts 

the 

point, 

set 

fixed 

the 

exceeds 

burner 

the 

of 

interior 

the 

in 

temperature 

the 

If 

the 

prevents 

which 

circut 

control 

the 

to 

interrupted 

is 

power 


open 

switch 

the 

of 

replaced. 

is 

switch 

the 

until 

interrupted 

is 

Power 



Vestibule 

Link 

Fuseable 

point, 

set 

fixed 

the 

exceeds 

enclosure 

vestibule 

the 

of 

interior 

the 

in 

temperature 

the 

If 

which 

circut 

control 

the 

to 

interrupted 

is 

power 


open 

switch 

the 

of 

contacts 

the 

replaced. 

is 

switch 

the 

until 

interrupted 

is 

Power 



the 

prevents 

Low Gas 


High 

Switches 

Pressure 

the 

above 

or 

point, 

set 

adjustable 

below the 

point 

a 

reaches 

pressure 

gas 

the 

If 

the 

to 

interrupted 

is 

power 


open 

switch 

the 

of 

contacts 

the 

point, 

set 

adjustable 

gas 

until 

interrupted 

is 

Power 



the 

prevents 

which 

circut 

control 

by 

reset 

manually 

is 

control 

the 


points 

low set 


high 

the 

between 

is 

pressure 

gas 

the 

until 

reset 

not 

will 

switches 

The 

position. 

reset 

the 

to 

switch 

the 

moving 

parameters. 

point 

set 

the 

within 

is 

pressure 

Combustion 

Flow Switch 

Air 

switch 

the 

of 

contacts 

the 

point, 

set 

fixed 

below the 

drops 

pressure 

air 

differential 

the 

If 

from 


the 

prevents 

which 

circut, 

control 

the 

to 

interrupted 

is 

power 


open 

close. 

contacts 

the 

that 

so 

flow increases 

air 

until 

interrupted 

is 

Power 

operating. 

Safeguard 

Flame 

Control 

boiler. 

the 

with 

supplied 

manual 

the 

to 

Refer 

Frequency 

Variable 

(VFD) 

Drive 

the 

of 

speed 

rotational 

the 

vary 

to 

is 

function 

primary 

drive's 

frequency 

variable 

The 

VFD is 

The 

process. 

combustion 


the 

of 

requirements 

air 

the 

on 

based 

fan 

blower 

is 


2-Stage 

for 

fan 

the 

of 

speed 

The 

boilers. 

Modulating 


2-Stage 

both 

for 

used 

signal 

ma 

4-20 

a 

to 

responds 

boilers 

Modulating 

VFD on 

The 

relays. 

through 

triggered 

Controller. 

Temperature 

Digital 

from the 

Temperature 

Digital 

Controller 

The 

boilers. 

modulating 

all 

on 

used 

is 

controller 

temperature 

based 

microprocessor 

The 

the 

on 

based 


the 

of 

rate 

firing 

the 

control 

to 

is 

function 

basic 

controller's 

The 

set-point. 

controller's 

the 


temperature 

water 


bulk 

the 

between 

difference 

external 

an 

on 

based 

set-point 

operating 

the 

change 

to 

ability 

the 

has 

also 

controller 

reset) 

outdoor 

or 

setting 

demand 

reduced 

for 

closure 

(contact 

signal

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