John Wood Commercial - 300-400K BTU - Manual (Page 12)

12
extended Vent terminations
The water heaters covered by this manual can be installed using
4 inch pipe for the intake air and/or vent piping up to a maximum
of 70 equivalent feet (21.3 m). The intake air and/or vent piping
can be extended up to 120 equivalent feet (36.5 m) by installing
6 inch pipe. See the Venting requirements on page 21.
The water heater ships from the factory with two (2) 4 inch
terminations that are 45° PVC elbows with a debris screen
installed. When 6 inch intake air or vent pipe is installed, factory
supplied 6 inch terminations must be used.
Contact your local distributor or call the parts department phone
number listed on the back cover of this manual to order 6 inch
termination(s).
optional concentric terminations
The water heaters covered by this manual can be installed in a
Direct Vent configuration using optional concentric terminations.
AJWSH130300 models installed using 4 inch vent/intake air
piping use the 4 inch concentric termination. AJWSH130300
models installed using 6 inch vent/intake air piping use the
6 inch concentric termination. AJWSH130400 models must
use the 6 inch concentric termination on all installations. See
Venting requirements on page 21 and Concentric Termination
Installation on page 26.
Concentric terminations must be ordered separately. Contact
your local distributor or call the parts department phone number
listed on the back cover of this manual to order.
• 4” Concentric Termination Part # 9006328005
• 6” Concentric Termination Part # 9006327005
hard water
Where hard water conditions exist, water softening or the
threshold type of water treatment is recommended. This will
protect the dishwashers, coffee urns, water heaters, water piping
and other equipment.
See Maintenance on page 60 for sediment and lime scale
removal procedures.
circulation pumps
A circulating pump is used when a system requires a circulating
loop or there is a storage tank used in conjunction with the water
heater. See the Water Piping Diagrams beginning on page 67
for installation location of circulating pumps.
See Circulation Pump Wiring Diagrams on page 66 for electrical
hookup information. Install in accordance with the current edition
of the National Electrical Code, NFPA 70 or the Canadian
Electrical Code, CSA C22.1.
All-bronze circulators are recommended for used with commercial
water heaters.
Some circulating pumps are manufactured with sealed bearings
and do not require further lubrication. Some circulating pumps
must be periodically oiled. refer to the pump manufacturer’s
instructions for lubrication requirements.
insulation blankets
Do not obstruct water heater air intake
with insulating blanket.
Gas and carbon monoxide detectors
are available.
Install water heater in accordance with
the instruction manual.
Breathing carbon monoxide can cause brain damage or
death. Always read and understand instruction manual.
Breathing Hazard - Carbon Monoxide Gas
Insulation blankets are available to the general public for external
use on gas water heaters but are not necessary with these
products. The purpose of an insulation blanket is to reduce the
standby heat loss encountered with storage tank heaters. The
water heaters covered by this manual meet or exceed the Energy
Policy Act standards with respect to insulation and standby heat
loss requirements, making an insulation blanket unnecessary.
Should you choose to apply an insulation blanket to this
heater, you should follow these instructions. See the Features
and Components section of this manual for identification of
components mentioned below. Failure to follow these instructions
can restrict the air flow required for proper combustion, potentially
resulting in fire, asphyxiation, serious personal injury or death.
• do not apply insulation to the top of the water heater, as
this will interfere with safe operation of the blower assembly.
• do not cover the control system LCD on top of the water
heater.
• do not cover the Temperature-Pressure relief Valve.
• do not cover the instruction manual. keep it on the side of
the water heater or nearby for future reference.
• do obtain new warning and instruction labels from the
manufacturer for placement on the blanket directly over the
existing labels.
• do inspect the insulation blanket frequently to make certain
it does not sag, thereby obstructing combustion air flow.