Coates 6ILS Installation and operating instructions

IN-LINE HEATER
MODELS:
6ILS
5.5 kW
240V SINGLE PHASE
WARNING
Only qualified personnel, as defined by National Electric Code Article
100, should install and maintain this equipment. Unauthorized
alteration or improper maintenance of this unit may release the
manufacturer from any warranty claims. The installation must be in
accordance with the instructions in this manual and applicable local
plumbing and electrical codes.
CAUTION
THE ELECTRICAL INSTALLATION MUST BE IN ACCORDANCE
WITH ARTICLE 680 OF THE NATIONAL ELECTRICAL CODE.
BEFORE YOU BEGIN
CHECK ALL ELECTRICAL CONNECTIONS TO ALL COMPONENTS
WITHIN THE HEATER FOR TIGHTNESS. CONNECTIONS CAN
BECOME LOOSE DURING SHIPMENT AND HANDLING.
INSTALLATION, OPERATION
AND MAINTENANCE
Publication 4/09

1.0 DESCRIPTION
Coates Spa Heaters are intended for use on spas or
hot tubs having a forced water circulation system.
The water flow through the heater should be at least
15 GPM but should not exceed 70 GPM. Higher
flow may damage the heater. An external bypass
should be installed to limit the flow to within this
range.
2.0 INSTALLATION
CHECK ELECTRICAL CONNECTIONS TO ALL
COMPONENTS within the heater for tightness.
These can become loose during shipment and
handling.
2.1 PHYSICAL PLACEMENT
CAUTION
THE ELECTRICAL INSTALLATION MUST BE IN
ACCORDANCE WITH ARTICLE 680 OF THE
NATIONAL ELECTRICAL CODE (NEC).
The Coates Spa Heater is suitable for indoor
installation. See Figure 1 for piping connections
and Figure 2 for electrical connections. Leave
minimum clearance of 4 inches on the top for
element removal and service access.
2.2 ELECTRICAL INSTALLATION
The electrical supply power must be single phase,
2 wire, 240 VAC. The supply must be protected
by a ground fault circuit interrupter (GFCI) in
accordance with NEC Article 680. An electrical
disconnect with over-current protection must be
provided. An insulated ground conductor must be
provided. See Figure 2 for electrical connections.
A lug has been provided for attachment of the
BONDING wire per the NEC Article 680-22, (a)(4).
This lug is located next to the conduit entrance.
WARNING
Only qualified personnel, as defined by National
Electric Code Article 100, should install and
maintain this equipment. Unauthorized alteration
or improper maintenance of this unit may release
the manufacturer from any warranty claims. The
installation must be in accordance with the
instructions in this manual and applicable local
plumbing and electrical codes.
** NOTICE **
NO PRESSURE RELIEF
VALVE IS SHIPPED WITH
THIS HEATER AND NONE
IS REQUIRED PER UL
STD 1261. DO NOT
INSTALL SHUT OFF
VALVE BETWEEN THE
HEATER AND POOL OR
SPA. A CHECK VALVE IS
ACCEPTABLE AND IN
ACCORDANCE TO UL STD
1261 REVISED JULY 1983.
COATES POOL
HEATER
FILTER
POOL
or
SPA
CHECK
VALVE
DRAIN
VALVE BALL OR GATE
VALVE
PUMP BALL OR GATE
VALVE
CAUTION
DO NOT INSTALL ANY SHUT-OFF
VALVE ON DISCHARGE SIDE OF
HEATER. A SWING CHECK
VALVE IS PERMITTED.
Exception: If a 30 psi (2.1 Kg/cm2)
pressure relief valve is installed
between the heater and valve, the
valve may be of the shut-off (ball or
gate) type.
FIGURE 1 – PIPING DIAGRAM

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.

WARNING:
Only qualified personnel should attempt maintenance on this equipment. (NEC Article 100)
HEATER TROUBLE SHOOTING GUIDE
- CAUTION -
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.
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.
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
ALKALINE
HEATER
CAN BE
DAMAGED
CORROSIVE
WATER IDEAL RANGE ALKALINE WATER
0 1 2 3 4 5 6 7 7.2-7.8 8 9 10 11 12 13 14
HEATER
CAN BE
DAMAGED
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.
PROTECTING YOUR COATES HEATER
WITH PROPER WATER CHEMISTRY
PROBLEM INDICATORS POSSIBLE CAUSES ACTION
No Heat "HEAT" light OFF No Power to heater Check Circuit Breaker "ON".
Insufficient Flow/Pressure Check that pump is running and filter is clean.
Pressure Switch out of adjustment Consult this manual, Section 3.4, for adjust-
ment instructions.
Pressure Switch inoperative Use Ohm meter to check continuity across
switch while pump is running. Replace Pressure
Switch if Open.
"HEAT" light ON Heating Element inoperative Replace Element as required.
Insufficient
Heat "HEAT" light ON Heater too small for Spa Check heater sizing requirement of Spa.
High Limit
RESET Trips "HEAT" light OFF Temperature control inoperative,
water overheats in Spa. Replace Temperature Control.
Pressure Switch not turning off
heater when pump/flow stops Consult this Manual Section 3.4 for adjustment instructions. Replace as required.
Heater subjected to high ambient
temperature (i.e. Direct sunlight) Cool Equipment room or shade heater from sun.
High Limit switch inoperative Replace High Limit Switch
Water Temp
Greater than
setpoint
"HEAT" light ON Thermostat out of calibration/
inoperative Replace thermostat.
"HEAT" light OFF External heat source (i.e. Solar
Heating, heat from the pump, etc.) Turn off power to heater and verify problem continues.

LIMITED WARRANTY
The company extends this limited warranty to the original purchaser of a Coates Electric Spa Heater.
Coates warrants the electrical components* and wiring (excluding enclosure, enclosure parts, knobs and accessories) in this
new Spa Heater to be free from defects in materials and workmanship for one (1) year from the provable date of purchase, or
eighteen (18) months from date of factory shipment, whichever occurs first. Coates further warrants the stainless steel water
containment vessel to be free from defects in materials and workmanship for two (2) years from the provable date of
purchase or thirty (30) months from the factory shipment, whichever occurs first. Enclosure, enclosure parts, knobs and
accessories have no warranty whatsoever.
*Exception: Factory installed heating elements are warranted for ninety (90) days from the date of heater installation, or one
(1) year from date of factory shipment, whichever occurs first.
COATES will repair or replace at its option, defective component parts as explained above, during the warranty period
provided such parts are returned to the factory, freight prepaid. Factory authorization MUST BE OBTAINED under this
warranty before returning such defective parts.
Limited Warranty Does Not Cover
1. New products purchased outside the United States of America and Canada.
2. Uncrating, unpacking, set-up, installation and / or startup of this unit.
3. Adjustments to controls normally operated by consumer, purchaser or installer.
4. This limited warranty does not extend to any defect, malfunction or failure caused by, or resulting from improper
service, maintenance or repair, abuse, neglect, accident, corrosion caused by improper water chemistry or by
equipment that use salt to create a sanitizer, lack of water, or any other cause beyond the control of Coates
Heater Company, Inc. or to any product where the nameplate shall have been removed, altered, replaced, defaced or
rendered illegible.
5. This limited warranty is void if the Heater is used in a salt water system or under any extreme or unusual
corrosive condition for which stainless steel metals would not be recommended.
6. This limited warranty does not extend to the repair or replacement of defective components except at COATES or a
service facility authorized by COATES
IMPLIED WARRANTIES, WHEN APPLICABLE, SHALL COMMENCE UPON THE SAME DATE AS THE EXPRESS
WARRANTY PROVIDED ABOVE, AND SHALL, EXCEPT FOR WARRANTIES OF TITLE, EXTEND ONLY FOR
THE DURATION OF THE EXPRESS WARRANTY. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW
LONG AN IMPLIED WARRANTY LASTS, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU. THE ONLY
REMEDY PROVIDED TO YOU UNDER AN APPLICABLE IMPLIED WARRANTY AND THE EXPRESS
WARRANTY SHALL BE THE REMEDY PROVIDED UNDER THE EXPRESS WARRANTY, SUBJECT TO THE
TERMS AND CONDITIONS CONTAINED THEREIN.
COATES SHALL NOT BE LIABLE FOR INCIDENTAL AND CONSEQUENTIAL LOSSES AND DAMAGES, UNDER
THE EXPRESS WARRANTY, ANY APPLICABLE IMPLIED WARRANTY, OR CLAIMS FOR NEGLIGENCE,
EXCEPT TO THE EXTENT THAT THIS LIMITATION IS FOUND TO BE UNENFORCEABLE UNDER APPLICABLE
STATE LAW.
SOME STATES DO NOT ALLOW THE EXCLUSION OF LIMITATION OF INCIDENTAL OR CONSEQUENTIAL
DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU.
THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS
WHICH VARY FROM STATE TO STATE.
HEATER COMPANY, INC.
P.O. Box 1750
Kent, WA 98035
P/N 90007005 4/09