Install Instructions

8
4. Discontinues ignition spark when pilot ame is established. The
S8600 / S8610 control used on propane gas models provides safety
lockout if pilot fails to ignite within the pilot ame establishing period.
The S-8600 / S-8610 control used on natural gas models
continues
trial for ignition until pilot ame is established.
5. After proof-of-pilot ame, opens the main valve.
6. On a power loss, shuts the heater down. When power is
restored it will begin a new ignition cycle.
7. On a loss of ame, shuts off main gas and starts trial for pilot ignition.
PLEASE SEE TROUBLE SHOOTING SECTION FOR MORE
INFORMATION.
INTERMITTENT IGNITION CONTROL MODULE (I.I.D.)
FIGURE 3
CIRCULATING PUMP
Constant circulating pump operation of the heater voids the
warranty. Constant water ow through the unit will “wash” away
the copper’s natural protective coating. This is called velocity
erosion. This erosion is not as great a problem when intermittent
circulating operation is used per the recommended installation
procedure. Constant circulation of water between the storage
tank and the building is permissible as long as the water does not
constantly ow through the heater.
Only all bronze circulating pumps are used with commercial water
heaters.
Although circulating pumps are originally oiled and operated
by the manufacturer, THEY MUST BE OILED AGAIN BEFORE
OPERATED. Follow the manufacturer’s instructions. See
fig. 4.
TYPICAL CIRCULATING PUMP
FIGURE 4
Follow the same oiling procedure if a replacement circulating pump
is installed into the system.
TANK TEMPERATURE CONTROL
(NOT SUPPLIED)
DANGER
USE ANTI-SCALD VALVE(S) in the hot water system to reduce
the risks of scalds at points of use such as lavatories, sinks and
bathing facilities.
The tank temperature control is located in the lower portion of
the hot water storage tank, see PIPING DIAGRAMS. It is the
primary operating control of the system and regulates the water
temperature in the tank.
The storage tank thermostat should have contact ratings that
exceed the maximum electrical requirements of the system.
Typically, the thermostat should have motor full load and locked
rotor current ratings which exceed the total amount of current
required to drive the pump(s) controlled by the thermostat.
The thermostat should have a temperature range of 100
0
F
(37.7°C) to 180
0
F (82.2°C) or more. The preferred initial setting
for the storage tank thermostat is 120
0
F (48.8°C). However,
for normal use, the thermostat should be adjusted to the
lowest setting which produces an acceptable hot water supply
temperature. This will always give the most energy efcient
operation. Do not adjust the thermostat to achieve a storage
temperature of 190
o
F (87.7°C) or above. This action may
cause the automatic gas shutoff control to activate shutting
down the heater.
Intermittent ignition device and circulating pump start and stop
simultaneously as the tank thermostat contacts open and close.
This basic action, water owing whenever the burner operates,
must not be altered.
SAFETY FLOW SWITCH
(NOT SUPPLIED)
The safety ow switch is a safety device installed at the water
outlet of the unit to prevent main burner operation in the event
of inadequate water ow through the unit.
An accessory package No. 9005680205 containing a safety ow
switch is available for this application.
This switch may be mounted in a horizontal pipe line or a vertical
pipe line with upward water ow. Do not install the switch where
the water ow is downward.
For proper performance mount the switch in a section of pipe
where there is a straight run of at least 5 pipe diameters on each
side of the ow switch (i.e. do not locate adjacent to valves,
elbows, orices, etc.).
The ow switch shall be mounted in a standard 1” x 1” x 1” tee
for a 1” pipe application. For larger pipe sizes use a reducing
tee in order to keep the switch as close to the pipe as possible.
Install the ow switch in the branch (top) opening of the reducing
tee and provide adequate paddle length in the ow stream. For
example in a 2” pipe installation use a 2” x 2” x 1” reducing tee.
For 1”, 2” or 3” pipe use the paddle segments as supplied. For
other pipe sizes (i.e. 1 1/4”, 1 1/2”, and 2 1/2”) trim the paddle
to the proper pipe size, see g. 5. If a standard tee is used,
install a face or hex bushing in the top opening. The paddle
must be adjusted or trimmed to the size of the pipe in which it
will be installed.