Armstrong FLO-RITE-TEMP 8120 Instructions d'installation et de réglage - Page 8
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8.
With the unit now isolated from the hot water
system and all flow of water being directed to
drain, slowly increase the water demand to
approximately 3/4 of the maximum capacity
according to the capacity chart on page 13.
When starting a cold system, you should take
at least 2 to 3 minutes to slowly increase to
this demand. This will allow time for the
steam piping feeding the unit to come up to
temperature, pressure and purge itself of
excess condensate.
9.
Place a small screwdriver or center punch
through the hole in the HFT adjustment and
slowly turn the HFT to change the
temperature to the desired set point. Close
(clockwise) the HFT to raise the outlet water
temperature. Allow adequate time for the
water temperature to stabilize. This could
take several minutes if the piping is cold and
the measurement point is far from the unit.
(IMPORTANT: When making the HFT
adjustment, the LFT adjustment
SHOULD NOT rotate with the HFT
adjustment. If it does, you will have to
hold it stationary while making your HFT
adjustment).
10. Lower the water flow rate to 3 gpm. The
LFT adjustment is currently fully closed (see
step 8). Slowly open (counterclockwise) the
LFT to lower the outlet water temperature to
the desired set point. Allow adequate time for
the temperature to stabilize.This will take
longer since the flow rate is so small.
(IMPORTANT: When making the LFT
adjustment, the HFT adjustment shaft
SHOULD rotate with the LFT
adjustment. If it does not do so, you will
have to turn it by hand while making the
LFT adjustment).
11. Recheck the outlet water temperature at 3/4
of the maximum demand it will see. Adjust if
necessary. Opening the HFT
(counterclockwise) will lower the temperature
and closing the HFT (clockwise) will raise the
temperature. Note: You may want to fine
tune the HFT adjustments during normal
operation of the unit at heavy demand. If
outlet temperature is slightly low, turn HFT
clockwise to raise it. This should only be done
during the initial service of the unit or when
October 31, 2002 @ 3:15 pm
the unit has been cleaned. Never attempt to
re-adjust the unit with a dirty tube bundle -
always clean tube bundle first. The unit is now
adjusted.
(IMPORTANT: If, for any reason, you
must readjust the unit, you will first have
to return the LFT adjustment to the fully
closed position as stated in step 8).
CAUTION
When putting a heavy load on the heat
exchanger, watch the steam pressure gauge. This
pressure should not be permitted to fall below 2
psig. If it does and severe water hammer
develops, reduce the load by closing some of the
faucets or shut the system down. When steam
pressure drops under heavy load and hammering
occurs, not enough steam is getting to the unit.
This can be a result of an undersized reducing
valve, lack of boiler capacity or restrictive steam
lines. Hammering can also be caused by a loss of
water pressure where the water pressure in the
unit falls below the pressure of steam. This
condition is usually caused by improper shutdown
of the unit or someone closing the inlet water
valve with the steam pressure still on the unit.
8