Coates PHS SERIES 54 & 480V - Manual (Page 4)

B. Installation: Plumbing
Pipe the heater as shown in Figure 2 to the inlet and
outlet openings on the right side. Connect the heater
in line between the filter discharge and pool. The
water line coming from the filter should be connected
to the heater inlet, and the discharge line to the pool
should be connected to the outlet. The pool will not
heat properly unless it is plumbed correctly. If plastic
pipe is used, it should be suitable for at least 120°F
(49 °C).
A plumbing bypass around the pool heater is not
necessary unless flow rate though the heater exceeds
80 GPM. A minimum flow rate of 20 GPM is required.
Lack of sufficient flow will not allow the flow switch to
activate the heater.
It may be necessary, in larger Olympic-sized or public
pools, to use two or more heaters to obtain sufficient
KW capacity. If so, the heaters must be placed in
parallel, so that each heater takes equal flow.
DRAINAGE: A method of draining water away from
the heater and other equipment is to be provided. The
heater should be flushed at the end of each swimming
season. During flushing or service, water may be
spilled and could cause damage to the floor or other
equipment. A drain valve is to be installed in the
INLET plumbing.
3.0 ELECTRICAL INSTALLATION
1. Check nameplate rating to insure the heater
matches your electrical supply.
2. CHECK ELECTRICAL CONNECTIONS TO ALL
COMPONENTS within the heater for tightness.
These can become loose during shipment and
handling.
3. Check components for any moisture, rust, or dust
which may have accumulated during shipping, and
clean or dry where necessary.
All pool heaters covered in this manual have integral
thermostats, transformers, contactors and sequencers
where required.
Wiring diagrams included show internal wiring and
required field connections for various models. Consult
your local electrical code for proper wire and conduit
sizes, and other local requirements.
Do not connect the pool heater to, or operate at, a
voltage other than the voltage rated on the nameplate.
Bring wires of adequate size from a fused disconnect
switch or circuit breaker with an ampere rating of
125% of the ampere rating shown on heater
nameplate. Refer to Table 1 for wire sizes. Connect
power conductors to the power distribution block inside
the heater. All other internal connections are completed
and tested at the factory.
Ground wires must be insulated copper conductor and
the same size as supply wiring, but not less than #12
AWG.
Table 1
WIRE SIZE: AWG
KW
240V/1Ø 208V/3Ø 240V/3Ø 480V/3Ø
12 4 8 8 12
15 4 6 8 10
18 3 4 6 10
24 1 3 4 8
30 2/0 2 3 8
36 3/0 1 2 8
45 250MCM 2/0 1/0 4
54 350MCM 3/0 2/0 3
57 350MCM 3/0 2/0 3
Suggested size for insulated copper conductor
wires. Based on 125% correction factor for wire
with 75°C insulation.
A. To Connect Pool Heater to Power Supply
The pool heaters with load ratings over 48 Amps have
branch supplemental fusing already installed in the
element circuitry; see wiring diagrams. To connect to
the power supply, one needs only to protect the main
supply lines, either with a circuit breaker or fused
disconnect switch (Figure 1). Suggested wire sizes are
shown in Table 1.
Figure 1
B.
Startup Procedure:
1. Make sure that the pump is on and that there is at
least 20 GPM flow through the pool heater. The
heating elements will fail prematurely if allowed to
operate with insufficient water flow.
2. Check temperature control setting, also, examine
wiring for loose connections, etc.
3. Turn on power at main disconnect switch.
4. Turn on pilot switch on pool heater.
If the high temperature manual reset high limit switch
shuts off the heater, disconnect power at disconnect
switch and determine the cause before resetting.
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