6
MB Pool & spa heater
3. Make visual check of the burner and pilot
fl ame. Flame pattern on the main burner and
pilot is indicated in the previous illustration. Yellow
fl ame means restriction of the air openings. Lifting
or blowing fl ame indicates high gas pressure. Low
fl ame means low gas pressure. Should this occur,
shut the heater off and contact your gas supplier
or qualifi ed service agency.
4. On indoor heaters, clean room intake open-
ings to assure adequate fl ow of combustion and
ventilation air.
CAUTION:
Combustion air must not be contami-
nated by corrosive chemical fumes which can
damage the heater and void the warranty.
5. Keep area around heater clear and free from
combustible materials, gasoline and other fl am-
mable and corrosive vapours and liquids.
POOL & SPA WATER CHEMISTRY
IMPORTANT!
These Heaters are not suitable for
use on Salt Chlorinated pools. If this is intended
please contact the Manufacturer.
Chemical imbalance can cause severe damage to
your heater and associated equipment. Maintain
your water pH between 7.4 and 7.8 and total alka-
linity between 100 and 150 p.p.m. If the mineral
content and dissolved solids in the water become
too high, scale forms inside the heat exchanger
tubes, reducing heater effi ciency and also dam-
aging the heater. If the pH drops below 7.2, the
heater will be severely damaged. This will result in
corrosion of the heat exchanger.
Heat exchanger
damage resulting from chemical imbalance is
not covered by the warranty.
AUTOMATIC CHLORINATORS AND CHEMICAL
FEEDERS
All chemicals must be introduced and completely
diluted into the pool or spa water before being cir-
culated through the heater. Do not place chlorine
tablets or bromine sticks in the skimmer. High
chemical concentrations will result when the pump
is not running (i.e. overnight).
Chlorinators must feed downstream of the heater
and have an anti-siphoning device to prevent
chemical back-up into the heater when the pump is
shut off.
NOTE: High chemical concentrates from feeders
and chlorinators that are out of adjustment will
cause very rapid corrosion to the heat exchanger in
the heaters. Such damage is not covered under the
warranty.
COLD WEATHER OPERATION
MODERATE CLIMATE:
Heater operation can
continue during short term cold spells. When tem-
peratures are below freezing, fl ow (continuous pump
operation) must be maintained.
CAUTION: Do not use the heater to maintain wa-
ter temperatures just above freezing or for freeze
protection. When heater is used during freezing
weather, care must be taken to avoid freeze ups.
Continuous pump operation is a must. Additional
protection may be required. The heater is not war-
ranted against freeze ups.
COLD CLIMATE:
Prolonged operation with water
temperatures below 10°C (50°F) is not recommend-
ed. When starting the heater with pool temperatures
below 10°C (50°F) operate the heater continuously
until higher temperatures are reached. Operating
the heater for prolonged periods with pool water
below 10°C (50°F) can seriously damage the heater,
and is not covered by the warranty.
For cold climate areas, please follow the winterizing
procedures listed.
WINTERIZING THE POOL & SPA HEATER
When heaters installed outdoors in freezing climate
areas are to be shut down for the winter, observe the
following step-by-step procedure:
1. Shut off the gas supply to the heater, and turn off
the electrical supply at the fused spur.
2. With the pool pipe work system drained as
necessary, drain the return header by either re-
moving the drain plug or opening the drain valve
(refer to replacement parts section of your heater
model for details on the drain point location).
3. After winter; to put back into use close the drain
point and purge the header and pipework from
all trapped air, before operating the heater