Burnham Apex Brochure

95% THERMAL

EFFICIENCY

500, 625, 725,

800 MBH

MULTIPLE

VENTING OPTIONS

UP TO 200

EQUIVALENT FEET

NEGATIVE

PRESSURE

CABINET

5:1 MODULATION

Apex™ Series

STAINLESS STEEL, CONDENSING,
GAS-FIRED COMMERCIAL BOILER

EQUIPPED WITH ABC 2.1
CONTROL SYSTEM

- MULTIPLE BOILER LEAD/LAG
UP TO 8 BOILERS

- LCD TOUCHSCREEN DISPLAY

- INTUITIVE TEXT-BASED MENUS

- OUTDOOR RESET

RELIEF VALVE
UP TO 100PSI

SUB 20PPM NOx

STACKABLE

Low
NOx

2

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Apex Boiler FEATURES

High Performance Commercial Hydronic
and Radiant Heating

Introducing the Apex from Burnham Commercial, a condensing
boiler with thermal eciency ratings of 95%. The Apex utilizes a
stainless steel heat exchanger, designed to extract maximum heat
from the combustion process, along with the Apex Boiler Control
System which is designed to enhance boiler and system eciency
and provide easy installation and servicing. These intelligent
features are wrapped in a sleek, modern appliance-like jacket,
which makes the Apex both attractive and smart.

Stainless Steel Heat Exchanger

The heart of the Apex
boiler is the ASME-certied
stainless steel heat
exchanger. Each heat
exchanger is factory
hydro-tested to ensure
quality and reliability.

• FLEXIBILITY OF VENTING OPTIONS

The ability to vent by using PVC material provides
multiple venting options and enables a greater level
of choice concerning the layout of a boiler room. Apex
boilers can be vented horizontally with a sidewall
penetration, or vertically. In addition to PVC, the Apex
can be vented with concentric polypropylene (500 model
only), AL29-4C stainless steel piping or with single wall
rigid and/or exible polypropylene vent piping.

The Apex Boiler Control System

The Apex Boiler Control System (ABC System) has many features
which maximize the eciency and comfort of a heating system,
while providing unmatched ease of use (for a full description of
these features, please see pages 4–5).

• LCD touchscreen display

• Intuitive menus which provide data in simple text,

not in cryptic codes

• Capable of linking up to eight boilers and three pumps

simultaneously

• Control data logging

• Outdoor reset and warm weather shutdown

• Domestic hot water priority

• Full modulation with 5-to-1 turndown and adaptable

ring rate output

• Built in provision for o-season pump exercising

• Plug and play connections

• Multiple and adjustable pump outputs

• Night setback and unoccupied modes

• 4–20mA and modbus inputs

• EMS Gateway to BacNet, LonWorks®, Modbus (optional)

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Apex Boiler FEATURES

Single Point Power

Boiler pump and DHW
pump are powered
directly from the Apex

Sealed Combustion
with Negative
Cabinet Pressure

Lower portion of the
boiler cabinet operates
under a negative pressure,
creating an additional
layer of safety

Simple
Connections

All gas, water and
electrical connections
are made from the left
side of the boiler

Condensate
Protection

Unique polyproplyene
condensate trap
(patented) stands up to
acidic condensate and
features an integral oat
switch which protects
the heat exchanger from
condensate back-up

Sealed
Top Panel

The sealed top panel
protects boiler controls
from spills or leaks; the
components are also
isolated from the lower
jacket to protect them
from cold or moist
combustion air

Smart Controls

ABC 2.1 control
system oers multiple
boiler lead/lag for up
to eight (8) boilers,
LCD touchscreen
display, intuitive
text-based menus
and outdoor reset

Ecient
Combustion

Air and fuel are
pre-mixed in the
blower assembly
for clean, balanced
combustion, longer
component life
and protection of
mechanical fan
components

Design
Simplicity

Separate spark rod
and ame sensor are
used for longevity
and reliability

Durable,
Ecient
Stainless Steel
Heat Exchanger

Maximizes
heat transfer

4

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Apex Boiler Control FEATURES BEYOND COMPARE

The Apex Boiler Control System is the next generation
of advanced electronic controls designed specically
for condensing boilers. The ABC System was designed
with many features that make the control simple to
understand and use, as well as features that optimize
boiler performance, exibility and overall system
eciency and reliability. The ABC System is simply
the most powerful, versatile and user-friendly boiler
control available.

Touch Screen LCD Display

• Simple setup! Requires only four inputs (boiler

minimum and maximum water temperatures and
outdoor air minimum and maximum temperatures).

• Boiler status, settings and diagnostic information

are all accessible from the display in simple
English text.

• Settings are password protected.

• Built-in diagnostics.

• Display turns red in the event of lockout.

Outdoor Reset

• Adjusts boiler temperature based on the

outdoor temperature.

• Helps to keep the boiler in condensing mode

longer, resulting in higher eciency.

• Improves comfort by reducing overheating

of the zones.

Domestic Priority with
Priority Protection

• Directs boiler output to the indirect water heater.

• Priority Protection is provided to allow the boiler

to continue heating in the event of excessive
domestic hot water demand.

Control Flexibility

• Responds to multiple heating demands, and

features adjustable pump outputs.

• Pump outputs for system, boiler and domestic

hot water pumps.

Warm Weather Shutdown

Control Data Logging

• Can display and recall information from numerous

control parameters.

• Previous ve (5) lock-out events can be recalled

on the display.

• Logs runtime hours for the boiler as well as the

number of cycles for the boiler, the boiler pump,
the DHW pump and the system pump.

• Ideal for commercial installations that maintain

heating loop temperatures year round.

• Fully adjustable.

Freeze Protection

• If possible freezing water temperatures are

detected, the ABC System will operate all pumps
connected to the boiler. If water temperatures
continue to drop, the boiler will re and warm
the system slightly in order to prevent freezing
and damage to the system.

Pump Exercise

• Circulators connected to the ABC System control

that don’t operate for seven (7) days, are activated
to run for ten (10) seconds.

• Reduces the possibility for pumps to seize and fail.

5

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Apex Boiler Control FEATURES BEYOND COMPARE

Staging and Modulation

• The ABC can be connected to external staging controls via a

4–20mA and heat demand contact.

• External controls can modulate the boiler's ring rate in order

to satisfy overall system demand.

• No external relays or adapters are required.

Energy Management System (EMS) Compatible

• Can be connected to a building’s Energy Management System (EMS)

using simple menu selections and wiring a 4–20mA input.

• Connects to EMS using modbus protocol.

• Optional EMS Gateway to BacNet or LonWorks.

• Allows EMS controls to adjust either the ABC central heating

setpoint or the ring rate.

Ease of Connectivity...

Cat 5 Connections

• Enables easy connections between boilers or

between boiler and building management system

• Utilizes ordinary RJ-45 (Cat 5 Ethernet) cord

Line Voltage
Terminal Strip

• 120V AC power,

pump outputs

• Strip slides out and

hooks to boiler for
easy access

“Night Setback” and “Unoccupied”
Control Modes

• EnviraCom™ enabled, allows the boiler to communicate directly

with Honeywell EnviraCom™ thermostats.

• Allows the boiler to further enhance system eciency by reducing

the water temperature during “sleep” and “away” modes.

Reliability

• Built-in brown out protection, with no additional devices such as

“brown out relays” required.

• Internal fuse protection for pump outputs is NOT REQUIRED.

The control is capable of handling up to 15 amps, and does not
require additional relays to switch power to the circulators in
most installations.

Low Voltage
Terminal Strip

• Adds additional

inputs for header
and DHW sensors

6

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Lower Cost HIGHER EFFICIENCY ALTERNATIVE

The Lower Cost, Higher Eciency
Alternative to Single Commercial Boilers

Modular/Multiple Boiler Concept

Modular/multiple boiler systems, such as the Apex put the
eciency, cost and service advantages of compact gas boilers
to work in heating applications where a single commercial
boiler would not be sucient. The systems connect any
number of compact, self-contained gas boilers together and
step-re them to eciently meet heating loads on demand.

Firing to Load Demand Minimizes
Standby Losses

Maximum fuel utilization is achieved during long periods
of full ring at the design temperature for each boiler. In
comparison, a single large boiler would cycle on and o,
more frequently during partial loads, not reaching its rated
eciency. During 90% of the average heating season, less
than 65% of the total heating capacity is required. Step-ring
activates only those boilers needed to meet the load demand
which reduces cycling and increases annual fuel eciency.

Features and Benets of Apex Boilers in
Modular/Multiple Boiler Installations

Choosing a modular or multiple boiler system can have many
benets over a single boiler installation.

• COMPACT DESIGN

• COST SAVINGS

The basic cost of a modular/multiple system is typically
less than that of a single large boiler of equal capacity in
most applications.

• BASE LOADING

The practice of replacing larger boilers with multiple,
smaller modular units can oer numerous benets such as
greatly increased eciencies with reduced standby losses,
cycling and emissions.

Program Outdoor Air Reset
Curve with only four points:

• Minimum boiler water temperature

• Maximum boiler water temperature

• Minimum outdoor air temperature

• Maximum outdoor air temperature

Lighter weight boilers like the Apex are suitable for
installation on any oor, from basement to penthouse.

- Apex boilers are readily portable, and can be brought
through standard doorways using a common hand truck.

- Apex boilers can be installed during any phase
of construction.

- Stackable –boilers mount on top of each other without
the use of a frame. Simply secure with bracket
hardware kit.

- Apex boilers can be interconnected via a common RJ45
ethernet cable (or by alternate three wire connection).

7

PAG E

Lower Cost HIGHER EFFICIENCY ALTERNATIVE

TO SYSTEM

FROM SYSTEM

Expansion

TO

System Piping

The Apex is designed to be installed in a variety of congurations. Shown
here are four illustrated examples of how the Apex boiler can be piped into
new or existing heating systems. Examples shown here include heat-only
applications, building heat plus domestic hot water, alternate piping of
heat plus domestic hot water and a multiple boiler installation incorporating
domestic hot water. The Apex provides outstanding exibility by providing
the capability of controlling up to three system pumps. In addition, an indirect
water heater can be placed in either the primary or secondary loop, further
enhancing the boiler’s ability to accommodate a variety of systems.

These illustrations are intended for informational purposes only, and
are not intended for use as near boiler piping diagrams.

For further information on piping requirements, please see the Apex
Installation & Operations Manual.

Circulators / System

Zone Valves

Tank

*

*

*Supply & return lines offset for clarity

HEAT-ONLY APPLICATION

TO SYSTEM

Circulators / System

Zone Valves

Expansion

Tank

Circulator

*Supply & return lines offset for clarity

SYSTEM

*Supply & return lines

FROM SYSTEM

*

*

Expansion

Tank

Circulators

offset for clarity

TO SYSTEM

Expansion

Tank

Circulators / System

Zone Valves

FROM SYSTEM

*

*

*Supply & return lines

offset for clarity

HEAT PLUS INDIRECT (ALTERNATE)HEAT PLUS INDIRECT

FROM

SYSTEM

*

*

*

*

*

*

MODULAR WITH INDIRECT

8

PAG E

Low voltage
knockouts
(24V)

F

Gas valve

inlet

H

Supply

tapping

Condensate

trap drain

M

N

O

Line voltage knockouts (115V)

A

B

C

D

E

I

K

L

P

Access panel

Access panel

Apex SPECIFICATIONS & DIMENSIONS

Apex Specications & Ratings

RATINGS

MODEL

MIN.
INPUT
(MBH)

MAX.
INPUT
(MBH)

GROSS

OUTPUT

(MBH)

NET

RATING

(MBH)

THERMAL

EFFICIENCY

GAS

CONNECTION

WATER

CONTENT

(Gal.)

APX500 100 500 475 413 95% 3/4" NPT 4.2 375 50.8 4" 1-1/2" NPT
APX625 125 625 593 516 95% 1" NPT 5.5 430 76.2 6" 2" NPT
APX725 145 725 688 598 95% 1" NPT 5.5 430 76.2 6" 2" NPT
APX800 160 800 760 661 95% 1" NPT 5.0 430 65.3 6" 2" NPT

Apex Dimensions

Model A B C D E F G H

APX500 44-7/8" 22-1/8" 29" 39-11/16" 29-3/8" 3/4" 1-1/2" 1-1/2"
APX625 50-1/4" — 24" 38-7/8" 31-5/8" 1" 2" 2"
APX725 50-1/4" — 24" 38-7/8" 31-5/8" 1" 2" 2"
APX800 54-9/10" 28-3/8" 34-1/4" 48-1/16" 33-3/16" 1" 2" 2"

Model I K L M N O P

APX500 12-1/4" 5" 7-7/16" 35" 17-5/16" 14-29/32" 16-11/16"
APX625 12-1/4" 5" 7-1/2" 35" 17-1/4" 7-1/4" 16-11/16"
APX725 12-1/4" 5" 7-1/2" 35" 17-1/4" 7-1/4" 16-11/16"
APX800 12-1/4" 5" 7-1/2" 35" 17-1/4" 7-1/4" 16-11/16"

APPROX.

SHIPPING

WEIGHT

(Lbs.)

HEAT
TRFR.
AREA

(SQ. FT.)

INTAKE
& VENT

DIA.

SUPPLY &

RETURN

CONNECTIONS

LEFT SIDE

Standard Equipment

ASME stainless steel heat exchanger
Stainless steel mesh burner
Full modulation, 5:1 turndown
Variable speed combustion blower
Negative reduction gas valve
Supply & Return temperature sensors
Flue gas temperature sensor
Sealed control compartment
Negative pressure lower cabinet
Outdoor air temperature sensor

Optional Equipment

Condensate Neutralizer
Header Sensor–1/2NPT required for
multiple burner systems
Header sensor, alternate immersion
(103104-01)
RJ45 Cable Splitter (103192-01)
80 psi relief valve (all models)

©2013 Burnham Commercial • P.O. Box 3939, Lancaster, PA 17604

Front-mounted terminal switch
Low voltage terminal strip
Line voltage junction box
Polypropylene condensate trap
Pressure relief valve, 50 psi for 500
Pressure relief valve, 60 psi for 625, 725, 800
Rear ue outlet
Stacking boiler brackets
Built-in lifting handles

100 psi relief valve (all models)
Tekmar 265-3 boiler modulating control
CSD-1 Kit–Includes high and low gas pressure switches,
manual reset high limit, manual reset low water cuto

and gas valve leak test equipment.
Burnham Commercial Universal Gateway–
LonWorks or BacNet/Metasys/Modbus Compatible

Phone: [phone] • Fax: [phone] • www.burnhamcommercial.com

Form No. CCIL02081-4/13-3Mc Printed in the U.S.A.

PVC Vent Kit:

30" CPVC
90° Elbow
(2) Vent-terminals with
rodent screens

FRONT

ABC2.1™ (Apex Boiler Control):

Touch screen display
Built-in diagnostics
Slide out drawer
Multiple boiler lead-lag control
Domestic water priority
Warm weather shut down
4-20 mA inputs for external modulation