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MegaTherm Commercial Pool Heating Boiler
Page 13
If the inlet temperature is LESS THAN 100°F:
With the bypass valve “A” fully open, throttle
(turn down) outlet valve “B” slightly. Observe
the inlet thermometer for 5 minutes to see where
the inlet temperature stabilizes. If it remains
under 100°F, throttle outlet valve “B” a little
more. Repeat as necessary. If the inlet
temperature rises above 100°F, open outlet valve
“B” slightly until the inlet temperature stabilizes
as close to 100°F as possible (plus or minus 2°F).
If the inlet temperature is MORE THAN
100°F. If outlet valve “B” has been throttled
partially closed, open it slightly, wait 5 minutes,
and, if the temperature is not down to 100°F
(plus or minus 2°F) open it some more. If
bypass valve “B” is fully open and you are still
seeing inlet water temperatures in excess of
100°F, you can adjust bypass valve “A”.
Throttle it (turn down) slightly towards closed,
and wait until the inlet water temperature
stabilizes again. Repeat as necessary.
When the inlet temperature is stabilized at
100°F, either lock the valve handles, remove
them, or prominently mark them to prevent
tampering or accidental changes to the valve
positions.
If the pool water temperature needs to be raised
more than 10° F to reach a comfortable
swimming temperature, inspect and re-adjust the
valves twice a day to maintain the 100°F inlet
water temperature.
3. To prevent nuisance high limit tripping, set the
adjustable pump time delay relay to 10 minutes
for all models. This allows the boiler pump to
circulate water through the heat exchanger after
the burners shut off, recovering all residual heat
in the metal components.
4. The boiler outlet temperature with the bypass
adjusted as detailed above should be less than
142°F. The normal range will be 10 to 37°F
higher than the inlet temperature. If it exceeds
142°F, please contact the Service Department at
800-900-9276, extension 5406 for instructions.
Outlet temperatures in excess of 142°F may
cause intermittent high limit tripping.
POOL OPERATING CONTROL ADJUSTMENT:
5. Adjustable Differential Feature: Remove the
cover from the control box and verify that the
white differential potentiometer is set at about
2°F (1°C). NOTE: a 2°F
differential means that,
if the thermostat is set at 80°F, the heater will
come on at 78°F and go off when the pool
reaches 80°F. The 2°F value is a good starting
point for most installations. This differential may
be adjusted up or down to suit individual
applications.
6. The operating control temperature setting can be
Figure 14. Safety Components.
Manual Reset
High Limit
Flow
Switch
Low Water
Cutoff
(Optional)
Figure 15. Pilot Burners.
Spark ignition
Standing pilot
adjusted incrementally to obtain the desired pool
operating temperature.
3.5 Heater Shut Down
1. If heater is firing, turn operating control to
lowest value, wait 10 minutes for pump to stop
running, then turn power switch to off.
2. If heater is not firing, turn power switch to off.
3.6 Spring and Fall Operation
Stand-by Service
Turn the thermostat down to approximately
70°F (21°C). This will prevent the pool and
surrounding ground from becoming chilled and also
permit the pool to be raised to swimming temperature
in a shorter time.
A pool may be maintained at a lower temperature
than 70°F (21°C) with some increased likelihood of
condensation and damage to the unit. Models 500
through 1010 will maintain an inlet temperature of
85°F (29°C) to 90°F (32°C) (if the bypass is properly
adjusted) with a pool temperature of 60°F (16°C).
Models 1200 and 1430 can maintain the above with a
pool temperature of 65°F (18°C). For models 1670
Thermo-
couple