Install Instructions

13
• 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 ow.
combustion, potentially resulting in re, 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.
If a positive lock-up regulator is required follow these instructions:
1. Positive lock-up gas pressure regulators must be rated
at or above the input Btu/hr rating of the water heater
they supply.
2. Supply gas regulators shall have inlet and outlet connections
not less than the minimum supply gas line size for the water
heater they supply. See Table 11, page 40.
3. Positive lock-up gas pressure regulator(s) should be installed
no closer than 3 feet (1 meter) and no farther than 8 feet (2.4
meters) from the water heater’s inlet gas connection.
4. After installing the positive lock-up gas pressure regulator(s)
an initial nominal supply pressure setting of 7.0” W.C.
while the water heater is operating is recommended and
will generally provide good water heater operation. Some
addition adjustment maybe required later to maintain a
steady gas supply pressure.
5. When installing multiple water heaters in the same gas
supply system it is recommended that individual positive
lock-up gas pressure regulators be installed at each unit
from the supply gas connection on the water heater.
POWER SUPPLY
The water heaters covered in this manual require a 120 VAC,
1Ø (single phase), 60Hz, 15 amp power supply and must also
be electrically grounded in accordance with local codes or, in
the absence of local codes, with the National Electrical Code,
ANSI/NFPA 70 or the Canadian Electrical Code, CSA C22.1.
DEDICATED POWER WIRING AND BREAKERS
Dedicated power supply wires, ground wiring and dedicated
circuit breakers often prevent electrical line noise and are
required when installing the water heater.
POWER FLUCTUATIONS AND ELECTRICAL NOISE
The water heater’s control system requires a source of
stable clean electricity for proper operation. Connecting the
water heater to a branch circuit that is subject to uctuations
in voltage level or electrical line noise such as EMI (electro
magnetic interference) or RFI (radio frequency interference)
may cause erratic control system operation and malfunction.
A high quality power supply lter/suppressor such as the
Kleen Line model SELF/T-10 Series SC-L or equivalent must
be installed if the above conditions exist. Call the technical
support phone number listed on the back cover of this manual
for more information.
NOTE: Malfunctions caused by the power supply and costs to
install power supply lters are not covered under the limited
warranty.
GAS SUPPLY SYSTEMS
Low pressure building gas supply systems are dened as
those systems that cannot under any circumstances exceed
14” W.C. (1/2 PSI Gauge). These systems do not require
pressure regulation. Measurements should be taken to insure
that gas pressures are stable and fall within the requirements
stated on the water heater rating plate. Readings should be
taken with all gas burning equipment off (static pressure)
and with all gas burning equipment running at maximum rate
(dynamic pressure). The gas supply pressure must be stable
within 1.5” W.C. from static to dynamic pressure to provide
good performance. Pressure drops that exceed 1.5” W.C. may
cause rough starting, noisy combustion or nuisance outages.
Increases or spikes in static pressure during off cycles may
cause failure to ignite or in severe cases damage to appliance
gas valves. If your low pressure system does NOT meet these
requirements, the installer is responsible for the corrections.
High Pressure building supply systems use pressures that
exceed 14” W.C. (1/2 PSI Gauge). These systems must use
eld supplied regulators to lower the gas pressure to less than
14” W.C. (1/2 PSI Gauge). Water heaters require gas regulators
that are properly sized for the water heater input and deliver
the rating plate specied pressures. Gas supply systems where
pressure exceeds 5 PSI often require multiple regulators to
achieve desired pressures. Systems in excess of 5 PSI building
pressure should be designed by gas delivery professionals
for best performance. Water heaters connected to gas supply
systems that exceed 14” W.C. (1/2 PSI Gauge) at any time
must be equipped with a gas supply regulator.
All models require a minimum gas supply pressure of 4.4" W.C.
for natural gas and 8.5" W.C. for propane gas. The minimum
supply pressure is measured while gas is owing (dynamic
pressure). The supply pressure should never fall below 4.4"
W.C. for natural gas and 8.5" W.C. for propane gas. The supply
pressure should be measured with all gas red appliances
connected to the common main ring at full capacity. If the supply
pressure drops more than 1.5” W.C. as gas begins to ow to
the water heater then the supply gas system including the gas
line and/or the gas regulator may be restricted or undersized.
See Supply Gas Regulator section and Gas Piping section of
this manual. The gas valve on all models has a maximum gas
supply pressure limit of 14” W.C. The maximum supply pressure
is measured while gas is not owing (static pressure).
SUPPLY GAS REGULATOR
The maximum allowable gas supply pressure for this water
heater is 14.0 inches W.C. (3.49 kPa) for natural and propane
gas. Install a positive lock-up gas pressure regulator in the gas
supply line if inlet gas pressure can exceed these pressures at
any time.
INSTALLATION REQUIREMENTS