3.0 HEATER CONTROLS
The heater has a temperature controller adjustable
from 70°F to 104°F, one manual reset type high
temperature limit switch set at 118°F and a pressure
switch to prevent operation of heater without water
flow.
3.1 CAUTIONS AND WARNINGS
1. Be sure to check all cautions and warnings
in this manual and as displayed on the
heater labels before operating or performing
any maintenance on this heater.
2. Do not remove the heater cover while
electrical power is applied to the heater.
Power must be interrupted at the heater
supply circuit breaker or disconnect switch.
3. The MIN setting on the temperature control
dial is an OFF position. The heater will not
operate at this setting regardless of water
temperature.
3.2 STARTING THE HEATER
-
CAUTION
-
Do not operate heater without water.
1. Ensure that heater case is properly
grounded, and bonded.
2. Fill the system with water and start the
circulating pump.
3. Turn on electrical power at the heater supply
circuit breaker.
4. Set the temperature control to desired water
temperature and adjust accordingly after the
temperature has stabilized. DO NOT
EXCEED 104°F.
3.3 STOPPING THE HEATER
1. Turn off electrical power at the heater supply
circuit breaker before stopping the
circulating pump.
3.4 PRESSURE SWITCH ADJUSTMENT
The pressure switch, as factory set, should provide
proper operation for many installations. If the heater
is installed above or below the level of the spa or if a
two speed pump is used the pressure switch may
need to be adjusted for proper operation.
To verify the correct operation of the switch,
perform the following;
1. If pump has two speeds, set at low speed.
2. Disconnect the line voltage leads to the
pressure switch and connect an ohm
meter or other continuity tester across the
switch terminals.
3. Switch the pump on and off.
The pressure switch should close with the pump
on and open with the pump off. If it does not,
perform one of the following;
1. Switch closed with pump off – turn the
black thumbscrew clockwise (higher
pressure) until the switch opens.
2. Switch open with pump on – turn the black
thumbscrew counter-clockwise (lower
pressure) until the switch closes.
3. “Chattering” switch action with pump on –
turn the black thumbscrew counter-
clockwise (lower pressure) until switch
stays closed.
4.0 MAINTENANCE
1. Keep the heater clean.
2. If high temperature causes the limit
thermostat to cut off the electrical power,
turn off power at disconnect switch and
determine the cause before resetting the
switch. A water temperature drop is
required to allow resetting of the manual
reset high temperature limit.
3. If leaks develop in the heater or
connecting piping, shut down the heater
and repair defective connections.
4. If heating elements are removed for
replacement, use only Coates elements.
5.0 OPERATION SEQUENCE
1. Power supplied to heater (Circuit Breaker).
2. Pressure switch closes (with sufficient flow
from pump).
3. Rotate temperature dial until it is greater
than water temperature.
4. Element light illuminates and the element
heats the water.
WARNING
All checks and adjustments to the pressure
switch must be made with heater power
supply off.
Summary of Contents for 6ILS
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