IGNITION SYSTEM COMPONENTS
Fenwal 35-655305-121 Hot Surface Ignition Control, CE
listed. 3 Trials for Ignition, 15 second pre-purge timing, 15
second igniter heat up time, 4 second trial for ignition, 24
volt input to control.
Omron G2R-1A-T-AC24 relays (VDE listed) used for high
voltage switching of hot surface igniter and combustion
blower from the 24 volt outputs of the Fenwal control.
Saint Gobain 230 volt hot surface mini igniter.
Honeywell VK8115 gas valve (negative pressure regulator)
with matched venturi sizes for mixing gas with
combustion air.
EBM RG130 (36-6 and 43-9 kW/hr input sizes) and
RG148 (58-3 through 85-0 kW/hr. inputs) pre-mix
combustion blowers. 230 volts, 50/60 Hz.
Burner: Acotech (Bekaert Combustion Technology) Pre-
mix burner with stainless steel mesh outside knit.
Blocked Vent Pressure Switch: Honeywell IS20378-5770
normally closed pressure switch. Contacts open in the
event of a severe blockage of the flue outlet.
THERMOSTAT AND HIGH LIMIT
CONTROLS
Honeywell L6189A 2043B aquastat. Temperature
adjustment range: Below 40°C to maximum of 82°C (dial
stop to limit maximum temperature). Differential set to
4°C Capillary bulb inserts into well in top of tank.
Thermostat dial adjustable on top front section of water
heater jacket.
Honeywell L6189C 2023 1 High limit control. Set point
fixed to 93°C with screw. Mounted to control panel inside
control compartment. Capillary bulb inserts into separate
well in top of tank. Manual reset control button accessible
through clearance hole in control panel.
HEAT EXCHANGER
Burner fires down into 8” diameter flue tube transferring
the radiant heat from the burner flame into the tank water.
1st Pass Flue Collector: At the bottom of the tank, a
refractory lined heavy gauge flue collector re-directs the
flue gases from the 8” flue tube to pass through two 4”
diameter flue tubes to the top of the tank.
4” diameter flue tubes have stainless steel baffles to
turbulate the flue gases to improve heat transfer.
2nd Pass Flue Collector: At the top of the tank, the flue
gases from the 4” flue tubes collect in a heavy gauge
steel collector to redirect the flue gases down eight 2”
diameter flue tubes.
2” diameter flue tubes are glass lined on the inside as well
as outside to prevent corrosion from flue gas condensate.
Stainless steel flue baffles inside the 2” flue tubes
turbulate the flue gases to aid heat transfer. Flue
temperatures are reduced from 260-340°C from the
second pass collector to 54°C or less in the flue exhaust.
3rd Pass Collector: The flue gases from the bottom of the
2” flue tubes are collected at the bottom of the tank in a
stainless steel flue collector, where the exhaust gases and
condensate exit out through a short Stainless Steel pipe
extending outside the jacket that connects to the coaxial
concentric flue system.
VENTING SYSTEM
A condensate tee with a silicone seal is connected to the
plastic exhaust pipe and interfaces with the flue system.
The tee connection has a 32mm condensate drainpipe
connection to allow the siphon to be fitted. The waste
pipe will then be taken from the siphon outlet to drain.
A section of aluminium flue pipe will run to the top of the
water heater to connect to the air intake tee.
The intake tee adapts to the concentric flue pipe and has
an elbow to connect to the combustion air intake pipe.
The 100/150 mm dia. Andrews’ concentric flue pipe will
then run to the horizontal or vertical flue terminal.
Maximum concentric flue for this product is 16 metres.
Each additional 90° elbow is equivalent to a reduction of
1.2 metres of straight flue pipe.
Each additional 45° elbow is equivalent to a reduction of
0.7 metres of straight flue pipe. If a condensate trap is
installed, this is equivalent to a reduction of 1.5 metres of
straight flue pipe.
WATER CONNECTIONS
Front hot and cold 1½” BSP (male) water supply
connections.
GAS CONNECTIONS
¾” Gas Inlet Nipple for BSP connection to gas supply.
1” Gas Inlet Nipple for BSP connection to gas supply for
the EC380/1900 model.
SECTION 3 •
INSTALLATION
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