Coates ST Series Installatie- en bedieningshandleiding - Pagina 5
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Only qualified personnel should attempt maintenance on this equipment. (NEC Article 100)
PROBLEM
INDICATORS
No Heat
No lights ON
Flow light ON
Element light OFF
Flow light ON
Element light ON
Insufficient
Flow light ON
Heat
Element light ON
High Limit
Flow light ON
RESET Trips
Element light OFF
Water Temp
Flow light ON
Greater than
Element light ON
setpoint
Flow light ON
Element light OFF
Elements can be checked with an Ohm meter only when power is disconnected from heater and all wires have
been removed from the element terminals. Each element should read approximately 10.5 Ohms.
Ambient temperatures above 120°F will cause the high temperature limit to trip prematurely.
HEATER TROUBLE SHOOTING GUIDE
This heater incorporates 240 volt electrical circuits.
Do not open the case unless unit is disconnected from electrical power.
Use only manufacturer's parts, or UL listing and warranty may be void.
POSSIBLE CAUSES
No Power to heater
Insufficient Flow
Flow Switch Inoperative
Flow Relay Inoperative
Hi-Limit Reset Tripped
High Limit switch inoperative
Temp Control inoperative or set too low
Contactor (upper) inoperative
Contactor (lower) inoperative
Heating Element(s) inoperative
Heater too small for Spa
One element inoperative on 11KW model
Temperature control inoperative, water over-
heats in Spa.
Flow Switch not turning off heater when pump/
flow stops
Heater subjected to high ambient temperature
(i.e. Direct sunlight)
High Limit switch inoperative
Thermostat out of calibration/inoperative
External heat source (i.e. Solar Heating, heat
from the pump, etc.)
PROTECTING YOUR COATES HEATER
WITH PROPER WATER CHEMISTRY
Proper water balance is important to extending the life of your Coates
Heater. While pH control is critical, the control of alkalinity and calcium
hardness will protect against scaling and also help to prevent corrosion.
ACID
HEATER
CORROSIVE
CAN BE
WATER
DAMAGED
0
1
2
3
4
The correct level of sanitizer, pH, total alkalinity and calcium hardness will very, depending
on the type of pool (plaster, fiberglass or vinyl) and the chemical content of the fill water.
Water that is out of balance can damage your pool heater and void the warranty. This
heater is not for use in salt water pools.
WARNING:
- CAUTION -
ACTION
Check Circuit Breaker "ON".
Check that pump is running and filter is clean.
Use Ohm meter to check continuity across switch while pump is
running. Replace Flow Switch if Open.
Use Ohm meter to check continuity across NO and COM terminals
while pump is running. Replace Flow Switch if Open.
Push "Reset" button
Use Ohm meter to check continuity across switch.
Replace High Limit Switch if always open.
Adjust control higher or replace as required.
You should hear it "click" if the switch is operational.
Replace upper contactor
Replace lower contactor
Replace Element(s) as required.
Check heater sizing requirement of Spa.
Replace Element as required.
Replace Temperature Control.
Check flow switch opens when pump is off. Replace as required.
Cool Equipment room or shade heater from sun.
Replace High Limit Switch
Replace thermostat.
Turn off power to heater and verify problem continues.
ALKALINE
IDEAL
ALKALINE
RANGE
WATER
7.2-7.8
5
6
7
8
9
10 11 12 13 14
HEATER
CAN BE
DAMAGED