Rudd ELS 552-2, ELS 1102-2 Installation Manual
INSTALLATION & OPERATING
INSTRUCTIONS
Electric
SPA-PAK
Heater
Models
ELS 552-2 & ELS 1102-2
FOR YOUR SAFETY: Do not store or use gasoline or other flammable vapors and
liquids or other combustible materials in the vicinity of this or any other appliance. To
do so may result in an explosion or fire.
Catalog No. 6100.53U Effective: 09-28-09 Replaces: 11-11-08 P/N 240362 Rev. 22
WATER CHEMISTRY
For your health and the protection of your pool equip-
ent, it is essential that your water be chemically
m
balanced. The following levels must be used as a
guide for balanced water.
Occasional chemical shock dosing of the pool or spa
should not damage the heater providing the water is
balanced.
Automatic chemical dosing devices and salt chlorinators are usually more efficient in heater water, unless
controlled, they can lead to excessive chlorine level
which can damage your heater.
CAUTION: Corrosive water voids all warranties.
Recommended
Level(s)
Water Temperature 68-88°F (20-31°C) 89-104°F (31-40°C) 68-104°F (20-40°C)
pH 7.3-7.4 7.3-7.4 7.6-7.8
Total Alkalinity (ppm) 120-150 120-150 80-120
Calcium Hardness (ppm) 200-300 150-200 200-400
Salt (ppm) 6000 Maximum 6000 Maximum 6000 Maximum
Free Chlorine (ppm)* 2-3 2-3 2-3
Total Dissolved Solids
(ppm)
*Free Chlorine MUST NOT EXCEED 5 ppm!
Fiberglass Pools Fiberglass Spas
3000 Maximum 3000 Maximum 3000 Maximum
Further advice should be obtained from your pool or
spa builder, accredited pool shop, or chemical supplier for the correct levels for your water.
Other Pool and Spa
Types
Rev. 22 reflects the following: Changes to: The C-UL Listed Mark on page 1.
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INTRODUCTION
Check Valve
To Spa
Filter
Chlorinator
Pump
Bypass
(Customer Installed)
Drain Valve
(Customer Installed)
Gate Valve
From Spa
NOTE: PVC pipe may be used.
The Spa-Pak spa Heaters have been designed to pro-
ide efficient, pollution-free, electric pool heating while
v
requiring minimal installation. The Spa-Pak consists of
a sheathed resistance element installed in a copper
tank.
This tank has a 1-1/2” inlet and outlet on the side for
plumbing connections. The heater voltage is 208/240V
single-phase. The control circuit passes through a
manual switch, the temperature control, and the magnetic contactor coil. All items are pre-wired and
installed in a baked enamel steel case.
It is essential that the heater be installed in accordance with the instructions given herein. Failure to do
so may cause damage to the heater and to the equipment to which it is connected, or may prevent the
heater from operating in a correct manner. The heater
is to be installed in accordance with article 680 of the
National Electrical Code ANSI/NFPA No. 70. Consult
State and local codes BEFORE installing this unit.
Where such codes have requirements beyond the
instructions given herein, the codes shall have precedence over these instructions.
Location
These heaters are listed by UL for either indoor or outdoor use. Unit must be mounted on a level base
parallel to the ground. Allow 6” clearance at sides and
18” clearance at top and front for maintenance. Secure
the unit with 5/16” mounting hardware using the holes
provided. The heater must be located where leakage
of heat exchanger or connections will not damage the
area adjacent to the heater or structure.
NOTE: When using two speed pumps, do not install
ate valve on inlet.
g
The Spa-Pak has 1-1/2” male NPT inlet and outlet
connections at the right side of the heater. The inlet is
at the base of the heater and must be piped directly to
the filter discharge to ensure proper flow direction.
Minimum flow rate through the heater is 15 gpm, maximum is 60 gpm. If this is exceeded, an external
bypass must be added as shown. Unions should be
used on piping connections. A shut-off valve should be
included on the heater inlet to prevent draining the spa
when performing maintenance.
CAUTION: No shut-off valves are to be installed in
the piping between the heater outlet and the spa.
Any chlorinators, valves, etc., that can cause return
line blockage will void the warranty.
Water Connections
Automatic Chlorinators and
Chemical Feeders
All chemicals must be introduced and completely diluted into the spa water before being circulated through
the heater. Do not place chlorine tablets or bromine
sticks in the skimmer. High chemical concentrations
will result when the pump is not running (e.g.
overnight).
Chlorinators must feed downstream of the heater and
have an anti-siphoning device to prevent chemical
backup into the heater when the pump is shut off.
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CAUTION: High chemical concentrates from feed-
TYPICAL COMFORTABLE
TEMPERATURE
RANGE FOR POOLS
T
YPICAL COMFORTABLE
TEMPERATURE
RANGE FOR SPAS
ers and chlorinators that are out of adjustment will
cause very rapid corrosion to the heater. Such damage is not covered under the warranty.
Thermostat
The heater thermostat located on the front of the unit,
may be set for any desired spa temperature.
odes. Keep wire runs as short as possible to mini-
c
mize voltage drop. Bring wires of size indicated from a
used disconnect switch (customer furnished) with an
f
amp rating of at least 125% of the amp rating shown
on the spa heater nameplate. A ground lug is provided
for connection to the supply ground. A wiring diagram
f the heater is shown at right. It is also affixed to the
o
inside front cover of the units.
Field Wiring
Heater requires three-wire service. With 240 VAC
there are two hot wires and a grounding conductor.
Even when metallic conduit is used, the grounding
conductor must be run to the supply ground.
Field wiring connections are made to the electrical
entry at the left side of the unit. A hole in the jacket is
provided for a 1” trade size conduit hub. The location
of the field wiring box is shown below. Wire nuts are
used to connect all leads except the grounding conductor, for which a pressure lug is provided.
NOTE: Heater grounding conductor shall be the
same or larger than the live power supply conductor.
Maximum Temperature Setpoint
(Knobstop Adjustment)
Adjustment to a different maximum setting is a simple
task. Loosen the small set screw on the knobstop and
rotate the knobstop ring until vertical “stop” tab is at the
desired maximum setting. Retighten the set screw.
ELECTRICAL
WARNING: The power supply circuit to this heater
shall be protected by a ground-fault circuit interrupter
(GFCI), in accordance with Art. 680 of the latest edition of the National Electrical Code (NEC). Failure to
do so could result in severe personal injury or death.
The GFCI devices shall be of the self-contained types,
circuit breaker types or the receptacle types. Feeder
ground-fault protection is not required where GFCI is
already provided in the branch circuits or receptacles
supplying power to the heater.
Electrical Disconnect
An electrical disconnect and over-current protection
device must be provided in accordance with local
Recommended Wire Sizes
for Field Connection
Use type THWN copper wire to the unit, with the AWG
wire sizes (Internal wire sizes may differ) listed in Table
A on the following page.
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