LAARS Mighty Therm AP (Sizes 500-1825) - Installation, Operation and Maintenance Instructions User Manual
Page 10
LAARS Heating Systems
Page 10
after the pump shuts off will not siphon chlorine
solution into the heater.
4.
When the operation of a chlorinator is such
that it must be installed in the pump suction, or
some other place where the chlorine solution
fl ows through the heater, corrosion of the heater
can occur. Excessive concentrations of chlorine
caused by improper adjustment or failure of the
chlorination equipment cause this corrosion. The
resulting damage to the heat exchanger is not
covered by heater warranty.
Section 3
Operation
3.1 Controls - General
(See Figures 11 and 12)
1. Electronic
Ignition
Controls:
a.
Intermittent
Ignition:
Pilots are automatically lit when the operating
control calls for heat (Systems #4, #9, and
#11). The unit performs its own safety check
and opens the main valves only after the pilot
is proven to be lit. Whenever the pilot fl ame is
interrupted, the main gas valve closes within
0.8 seconds.
b.
Electronically Supervised Standing Pilot
System (System #16):
When
pilot
fl ame fails, the ignition control
module responds in less than 0.8 seconds and
provides 100% safety shutdown.
2. Operating
Controls:
An electronic temperature control is provided
on model AP heaters to control the pool water
temperature. The temperature sensor (thermistor) is
located in the pool loop piping (see Section 2.8).
3.
Heater Power (On/Off/Auto) Switch:
This provides for constant or automatic pump
operation.
4.
High Limit Controls:
a.
The manual reset high limit switch is
provided as standard equipment on all heaters.
The temperature sensing bulb of the switch is
always located in the heater outlet. Burners
will automatically shut down whenever
overheating of water occurs.
b.
The auto reset limit switch is provided as
standard equipment on all heaters. The
temperature sensing bulb of the switch is fi eld
installed and should be located in the pool
loop piping. (See Section 2.8 for installation
instructions.) Burners will automatically shut
down whenever overheating of water occurs.
2.
Thread the spring and retainer onto the sensor cable
and secure sensor into the immersion well.
3.
Route cable to heater control panel in a location
where it will not be subject to damage. Secure with
nylon cable ties.
4.
Install the capillary tube/bulb sensor immersion
well on the underside of the pool loop piping. The
well should be installed just downstream of the
heater outlet tee. DO NOT INSTALL the bulb in
the heater loop piping or upstream of the heater
outlet tee.
5.
Route the capillary tube in a location where it will
not be subject to damage. Secure with wire ties.
2.9 Automatic Chlorinators
A concentration of chlorine in the heater can be very
destructive, therefor the following rules about the
installation and operation of such devices must be
followed:
1.
The chlorinator should be installed so it introduces
the gas or solution downstream from the heater.
2.
The chlorinator should be wired so it cannot operate
unless the fi lter pump is running.
3.
The chlorinator should be provided with an anti-
siphon device so that the draining of the piping
C
Figure 10 - Heater Piping Arrangement