JOHNSON CONTROLS
8
FORM ET130.13-NOM3 (708)
Coil Connections
Hot water and steam coils are male sweat connection.
Use appropriate brazing alloy for system temperature
and pressure. Refer to equipment construction submittal
drawing for specifi c connection size. MAXIMUM
HYDRONIC SYSTEM OPERATING PRESSURE
MUST NOT EXCEED 300 PSIG. MAXIMUM
STEAM SYSTEM PRESSURE MUST NOT
EXCEED 15 PSIG.
If necessary, you can change coil connection handing on
one and two row coils from left-hand to right-hand (and
vice-versa) by rotating the coil “like a steering wheel”
180° about its central axis when facing the fi ns. For
three and four row coils, consult factory.
Electrical
All fi eld wiring must comply with NEC and all local
codes. Electrical and control diagrams are affi xed to the
interior of the control enclosure box.
Minimum circuit ampacity (MCA) designates the
maximum operating load of the equipment for sizing
wire feeders. Supply Circuit Protection designates the
largest breaker in the electrical service panel that can
be used to protect the equipment.
Use Copper conductors only.
OPERATION
Start-Up
Thorough safety precautions should always be taken
when performing startup and service. Refer to safety
considerations at the beginning of this Operation
Manual. Only qualifi ed individuals should perform
these tasks.
Prior to start-up, the project control sequence/wiring
diagram should be obtained and thoroughly understood.
If factory supplied analog or DDC controls are utilized,
refer to the applicable Operation Manual for start-up
and balancing information. Check that all electrical
work is fi nished and properly terminated. Check that
all electrical connections are tight and that the proper
voltage is connected.
Check to make sure that heater elements are not
damaged, free of all foreign material and proper control
interlocks have been made before energizing the electric
heater.
Power Requirements
Three Phase AC power imbalance must not exceed 2%.
Be sure that the following guides are met:
1. AC power is within 10% of rated voltage at rated
frequency. (See equipment nameplate for rat-
ings)
2. AC power is within 5% of rated frequency at rated
voltage.
3. A combined variation in the voltage and frequency
of 10% (sum of absolute values) of rated values
provided the frequency variation does not exceed
5% of rated frequency.
Primary Air Damper and Fan Adjustment
Unit should not be balanced until the incoming power
supply is at the permanent voltage condition. All
discharge ductwork must be connected. The minimum
recommend discharge static pressure for all fan-powered
equipment is 0.1” wg. and 0.2” on 3/4hp and larger
(see fan curves located on the Enviro -Tec web site for
specifi cs). All foreign materials should be removed
from the duct system. Optional filters should be
installed as required.
Unless otherwise specifi ed, the fan motor has three
speeds. Fan speed is selected in the electrical control
enclosure by one of two methods. For units with dual
motors, see Figure 1A showing how the fan speed is
selected by placement of a factory supplied jumper
wire on a terminal strip. Otherwise see Figure 1B
which shows the wire to wire fan speed selection
method. Simply insert the male quick connect (from
control circuitry) into the female quick connect which
corresponds to high (black), medium (blue), or low (red)
motor speeds. Units are set to low speed at the factory
as standard in order to optimize energy effi ciency. A
three position rotary switch is optional.
ELECTRICAL SHOCK HAZARD
All power must be disconnected prior
to changing jumper or serious injury
or death will result.
All fan-power equipment is shipped with an electronic
solid state fan speed controller (SCR) for PSC motors.
The SCR is located in the control enclosure. Using
a 1/8” fl at blade screwdriver, adjusting the manual
potentiometer clockwise will increase the motor speed;
adjusting the potentiometer counterclockwise will
decrease the motor speed.
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