versa 055B, Инструкция по установке и эксплуатации, Страница: 23 / 36

23
Pressure Switch
The pressure switch, or heater actuator, ensures that
the heater operates only when the filter pump is in
operation. It is factory set at 1.75 PSI for deck level
installations. When the heater is located below the
level of the spa or pool, it may be necessary to reset
the pressure switch to compensate for the no-flow
static head. If it is necessary to reset the pressure
switch, we recommend the following procedure.
Pressure Switch Adjustment
1. With pump and heater on, turn adjustment knob
(clockwise) until a click is heard from the gas
valve.
2. Turn adjustment knob (counter-clockwise) 1/4
turn.
3. Turn pump off and on several times. Heater should
shut-off immediately. If it does not, repeat steps
above until proper adjustment is made.
Adjustment Knob
Heat Exchanger Height
Heat Exchanger Height
Pool or Spa
Fig. # 8152.0s
5' Max.
5' Max.
Two-Speed Pumps
In some cases, the flow on the low-speed is insuffi-
cient to operate the heater. This is apparent when the
pressure switch cannot be further adjusted or if the
heater makes banging noises. In these cases, the
pump must be run at high speed when heating the
water.
Flame Roll-Out Safety Switch
The heater is equipped with a thermal cut-off device to
prevent flame roll-out in the event the heat exchanger
becomes blocked. This is a "single-use" type fusible
link or thermal fuse, that must be replaced when dis-
abled by an over temperature condition, caused by
excessive restriction in the heat exchanger flue pas-
sage.
High Limits
The heater is equipped with two automatic high limits,
set to operate at 135°F and 140°F.
Fig. 24: Pressure Switch Adjustment
Fig. 25: Above/Below Installation Limits
NOTE:
If heater is installed outside of the limits
shown, a flow switch must be used in place of the
pressure switch when mounted and wired adjacent
to the heater.
CAUTION:
Do not operate the heater without the
function of a properly adjusted pressure switch.
Fig. 26: Flame Roll-Out Safety Switch
Fig. 27: High Limit