Coates ST 5.5 User Manual

SPA HEATER

INSTALLATION, OPERATION

AND MAINTENANCE

MODELS:

ST SERIES

5.5 & 11kW

240V SINGLE PHASE

BEFORE YOU BEGIN

CHECK ALL ELECTRICAL CONNECTIONS TO ALL COMPONENTS

WITHIN THE HEATER FOR TIGHTNESS. CONNECTIONS CAN

BECOME LOOSE DURING SHIPMENT AND HANDLING.

CAUTION

THE ELECTRICAL INSTALLATION MUST BE IN ACCORDANCE

WITH ARTICLE 680 OF THE NATIONAL ELECTRICAL CODE.

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.

Publication 10-2012

1.0 DESCRIPTION

2.2 ELECTRICAL INSTALLATION

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 80 GPM. Higher
flow may damage the heater. An external bypass
should be installed to limit the flow to within this
range.

2.0 INSTALLATION

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.

WARNING

CHECK ELECTRICAL CONNECTIONS TO ALL
COMPONENTS within the heater for tightness.
These can become loose during shipment and
handling.

2.1 PHYSICAL PLACEMENT

The Coates Spa Heater is suitable for indoor or
outdoor installation. See Figure 1 for piping
connections and Figures 3A or 3B for electrical
connections. The heater should be securely
mounted to a smooth, flat surface. It may be
conveniently located next to the filtration equipment.

Leave minimum clearances of 9 inches on the
left for element removal, 12 inches on the front
for maintenance, 6 inches on the back for
service entrance and the right side will be
determined by the plumbing configuration used.

The electrical supply power must be single phase,

CAUTION

THE ELECTRICAL INSTALLATION MUST BE IN
ACCORDANCE WITH ARTICLE 680 OF THE
NATIONAL ELECTRICAL CODE (NEC).

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 Figures 3A or 3B and Table 1 for
supply wire and circuit sizing. A lug has been
provided for attachment of the BONDING wire per
the NEC Article 680-22, (a)(4). This lug is located
between the inlet and outlet pipes of the heater

2

5

6

10

MENU

ELEM. FLOW

4

RESET BUTTON

°F HEATING°C

TEMPERATURE

CONTROL

F

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F

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T
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INLET/OUTLET PV C UNIONS
ID ACCEPTS 1 1/2 PVC PIPE
OD ACCEPTS 2" PVC FITTINGS

CSTILL1C

3

1

9

1

NOTE: TEMP
CONTROL BULB
ON LOWER LEG;
TEMP LIMIT BULB
ON UPPER LEG

8

7

Coates Spa Heater Assembly

Figure 2 – Coates Spa Heater Assembly.

Refer to Table 2 for part description.

** 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.

DO NOT INSTALL ANY SHUT-OFF
VALVE ON DISCHARGE SIDE OF
HEATER. A SWING CHECK
VALVE IS PERMITTED.

Exception
pressure relief valve is installed
between the heater and valve , the
valve may be of the shut-off (ball or
gate) type.

CAUTION

: If a 30 psi (2.1 Kg/cm2)

COATES POOL

HEATER

FIGURE 1 – PIPING DIAGRAM

DRAIN
VALVE

CHECK
VALVE

FILTER

BALL OR GATE

VALVE

PUMP

BALL OR GATE

VALVE

POOL

or

SPA

3.0 CONTROL PANEL

A. INDICATOR LIGHTS

The control has two indicator lights. The lights are
as follows:

STATUS LIGHTS

LIGHT DESCRIPTION (when Illuminated)

FLOW Sufficient water flow through heater.

ELEMENT Heating elements are powered.

B. DIGITAL THERMOSTAT CONTROL

For heaters equipped with a digital thermostat. The
digital thermostat control which measures the
temperature of the water as it enters the heater has
a MENU button, up and down adjustment buttons,
and an LED display. The desired water temperature
(set point) is controllable between 40°F and 104°F
(5°C and 40°C). The set point may differ from the
actual water temperature at the pool or spa due to
heat loss in the piping.

MENU:

The MENU button cycles through the three menu
items: Measured Water Temperature (default), SET
POINT and °F/°C.

ADJUSTING THE SET POINT:

Press one of the following buttons; MENU,
The display will momentarily blank and then the
current set point will be displayed. Press the

button to change the set point. Hold the button

down for rapid temperature changes.
The set point will be saved and the display will return

to the measured temperature after two seconds of
inactivity.

OPERATION:

In the measured temperature mode, the water
temperature in the heater is displayed. The LED
corresponding to the current temperature scale will
be illuminated. If the heater is calling for heat the
HEATING LED will be illuminated.

FAHRENHEIT TO CELCIUS:

Press the MENU button twice and the current
temperature scale will be displayed ( F or C ). Press

or buttons to toggle between F and C.

the
The temperature scale will be saved and the display

will return to the measured temperature after two
seconds of inactivity.

or .

or

ERROR CODE:

The display will read “Err” when it detects a
problem with the temperature sensor. This can be
caused by a faulty sensor or a loose connection
between the sensor and the temperature
controller.

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 and maintenance on these
heaters.

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

Turn off electrical power at the heater supply
circuit breaker before stopping the circulating
pump.

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,
see Table 2.