Armstrong FLO-RITE-TEMP 665DW Installation And Adjustment Instructions - Page 8
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down (Note: with water pressure on the unit the stem
should pop back up after depressing it). If the HFT
stem will not depress at all the valve is opened too
far and you must turn the adjustment clockwise until
there is 1/8" travel downward to the stem.
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).
Lower the water flow rate to 3 gpm. The LFT
10.
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 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