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Installation & Service Manual
42
Ignition and Control Timings
M9 Intermittent Spark Ignition Pilot Mod els
Pilot Trial for Ignition Period - 90 Seconds
Pilot Failure Response Time - 0.8 Seconds at less than 1.0 µA
flame current
Pump Delay Timing (Optional on Boilers) - 30 Seconds after
burner shut down
Freeze Protection
1. For boilers with the pump delay option, if either the inlet
sensor or the optional multi-purpose temperature
sensor reads below 40°F, the pump relay will turn ON.
When the temperature rises above 50°F the pump relay
will turn OFF.
2. Location - Heating boilers must be located in a room
having a temperature safely above freezing [32°F(0°C)].
3. Caution - A room where the appliance is installed and
operating under a negative pressure may experience a
downdraft in the flue of an appliance which is not firing.
The cold outside air pulled down the flue may freeze a
heat exchanger. This condition must be cor rect ed to
provide adequate freeze protection.
4. Freeze protection for a heating boiler or hot water supply
boiler using an indirect coil can be provided by using
hydronic system antifreeze. Follow the manufacturers
instructions. DO NOT use un di lut ed or automotive type
antifreeze.
5. A snow screen should be installed to pre vent snow and
ice accumulation around the appliance vent ing system in
cold climates.
6. Shut-down and Draining - If for any rea son, the appliance
is to be shut off, the following precautionary measures
must be taken:
(a) Shut off gas supply.
(b) Shut off water supply.
(c) Shut off electrical supply.
(d) Drain the unit completely. Remove one threaded
plug or bulbwell from the inlet side of the front
header and one from the outlet side of the front
header on the heat exchanger. Blow all wa ter out of
the heat exchanger.
(e) Drain pump and piping.
Freeze Protection for a Heating Boiler
System (if required)
1. Use only properly diluted inhibited glycol an ti freeze
designed for hydronic systems. Inhibited propylene glycol
is recommended for systems where incidental contact with
drinking water is possible.
ƽ CAUTION
DO NOT use undiluted or automotive type
antifreeze.
2. A solution of 50% propylene glycol will pro vide maximum
protection of approximately -30°F.
3. Follow the instructions from the glycol an ti freeze
manufacturer. The quantity of glycol an ti freeze required is
based on total system volume including ex pan sion tank
volume.
4. Glycol is more dense than water and chang es the viscosity
of the system. The addition of glycol will decrease heat
transfer and in crease frictional loss in the heating boiler
and re lat ed piping. A larg er pump with more capacity may
be required to maintain desired flow rates in a glycol
system.
5. Local codes may require a back flow preventer or actual
disconnect from city water supply when glycol antifreeze is
added to the system.
Water Treatment
In hard water areas, water treatment should be used to reduce
the introduction of minerals to the sys tem. Minerals in the
water can collect in the heat exchanger tubes and cause noise on
operation. Excessive build up of minerals in the heat ex chang er
can cause a non-warrantable failure.
Intermittent Pilot Spark Ignition
System
ƽ WARNING
The ignition module is not repairable.
Any mod i fi ca tion or repairs will invalidate
the warranty and may create hazardous
conditions that result in prop er ty damage,
personal injury, fire, explosion and/or
toxic gases. A faulty ignition module must
be re placed with a new module.
6 Start-up