Leslie Controls F-1240LDW Constantemp Double Wall Low pressure steam-water Heater - Manual (Page 3)

Adjustment Table and after determining Heater
capacity shown under your operating conditions,
adjust flow through Heater for approximately
50% of calculated capacity. Move temperature
adjuster (14) to the right or left until the desired
water temperature is achieved.
4. NOTE: There must be a water flow through
Heater in order to adjust set-point gain. Operate
Heater from minimum to maximum flow and
observe temperature at both of these extremes.
Rotate gain control as shown on Gain Adjustment
Curve Diagram until water temperature variations
are reduced to a minimum. Move gain adjuster in
small increments while adjusting, as total rotary
movement of adjuster is only 30 degrees. (See
Fig. 2)
5. After adjustments are completed, move lock nut
(13) until it is against plate (16) and lock in place
with lock nut set screw.
6. Heater is now adjusted and operating. No other
adjustments should be necessary unless there is a
change in your initial operating conditions. To
SHUT DOWN HEATER close steam stop valve
first, followed by water stop valve.
TO DRAIN UNIT FOR PROLONGED
SHUT-DOWN
(Where drainage is necessary)
1. Turn off steam supply and water supply.
2. Open a vent line in high point of system piping.
3. Remove relief valve to drain water from control
valve.
4. Open drain connections in steam and condensate
lines.
5. Be sure all water is drained from hot water
control valve and system if there is any danger of
freezing.
6. When restarting system, tighten all connections
and close all vents. Follow instructions shown in
Section II - Start-up Procedure to put Heater back
in operation.