Disconnect Power Supply Before Making Wiring Connections; To Prevent Electrical Shock And Equipment Damage; All Appliances Must Be Wired Strictly In Accordance With; Wiring Diagram Furnished With The Appliance. Any Wiring - Modine Manufacturing PDP Installation And Service Manual

installation

electrical connections

WARNING

1. Disconnect power supply before making wiring connections

to prevent electrical shock and equipment damage.

2. All appliances must be wired strictly in accordance with

wiring diagram furnished with the appliance. Any wiring

different from the wiring diagram could result in a hazard to
persons and property.
3. Any original factory wiring that requires replacement must
be replaced with wiring material having a temperature rating
of at least 105°C.
4. Ensure that the supply voltage to the appliance, as indicated
on the serial plate, is not 5% greater than rated voltage.
CAUTION

1. Ensure that the supply voltage to the appliance, as

indicated on the serial plate, is not 5% less than the rated
voltage.
1. Installation of wiring must conform with local building
codes, or in the absence of local codes, with the National
Electric Code ANSI/NFPA 70 - Latest Edition. Unit must be
electrically grounded in conformance to this code. In
Canada, wiring must comply with CSA C22.1, Part 1,
Electrical Code.
2. Two copies of the unit wiring diagram are provided with
each unit. One is located in the electrical junction box and
the other is suppled in the literature packet. Refer to this
diagram for all wiring connections.
3. Make sure all multi-voltage components (motors,
transformers, etc.) are wired in accordance with the power
supply voltage.
4. The power supply to the unit must be protected with a
fused or circuit breaker switch.
5. The power supply must be within 10 percent of the voltage
rating and each phase must be balanced within 2 percent
of each other. If not, advise the utility company.
6. External electrical service connections that must be
installed include:
a. Supply power connection (120, 208, 240, 480, or 600 volts).
b. Thermostats, summer/winter switches, or other accessory
control devices that may be supplied (24 volts).
NOTE: Propeller units supplied with 460/575 power will require
the use of a field step-down transformer. Refer to the serial
plate to determine the unit supply voltage required. Additional
information may be found in Table 14.1 and in the step down
transformer installation instructions.
figure 8.1- typical duct & airflow installation
recommended installations
TURNING
VANES
3" MIN.
A
3" MAX.
B
12" MIN.
side vieW
8
3" MAX.
12"
MIN.
3" MIN.
B
12"
A
TURNING
VANES
BAFFLE
side vieW
6-580.4
7. Refer to Figure 13.1 for the electrical junction box locations.
8. All supply power electrical connections are made in the
electrical junction box of the unit. The low voltage (thermostat
and accessory control devices) can be wired to the terminals
on the electrical junction box. Refer to the wiring diagram for
the terminal location of all low voltage wiring.

duct installation

IMPORTANT
Do not attempt to attach ductwork of any kind to propeller
models.
When installing the heater, always follow good duct design
practices for even distribution of the air across the heat
exchanger. Recommended layouts are shown in Figure 8.1.
When installing blower units with ductwork the following must
be done.
1. Provide uniform air distribution over the heat exchanger.
Use turning vanes where required. See Figure 8.1.
2. Provide removable access panels in the ductwork on the
downstream side of the unit heater. These openings should
be large enough to view smoke or reflect light inside the
casing to indicate leaks in the heat exchanger and to check
for hot spots on exchanger due to poor air distribution or
lack of sufficient air.
3. If ductwork is connected to the rear of the unit use Modine
blower enclosure kit or if using field designed enclosure
maintain dimensions of blower enclosure as shown on
page 23.
additional requirements for Blower model BdP
determining Blower speed
The drive assembly and motor on all blower units are factory
assembled. The adjustable motor sheave is pre-set for
operation of this unit under average conditions of air flow and
without any external static pressure. The motor sheave should
be adjusted as required when the unit is to be operated at other
than average air flows and/or with external static pressures.
Adjustment must always be within the performance range
shown on pages 16 and 17 and the temperature rise range
shown on the unit's rating plate.
To determine the proper blower speed and motor sheave turns
open, the conditions under which the unit is to operate must
be known. If the blower unit is to be used without duct work,
nozzles or filters, the only criteria for determining the motor
sheave turns open and blower speed is the amount of air to
be delivered. As an example, a model BDP350 unit, operating
with no external static pressure, that is, no duct work, nozzles,
etc., and is to deliver an air volume of 6481 cfm (cfm = cubic
feet per minute) requires the unit be supplied with a 5 hp motor,
a -207 drive, and the drive sheave must be set at 2.5 turns
open to achieve a blower speed of 960 rpm (see performance
table for units with or without blower enclosure, page 17). See
"Blower Adjustments" on page 9 for setting of drive pulley turns
open.
Dimension "B" Should Never Be Less than 1/2 of "A"
B
A
BAFFLE
side vieW
12"
B
MIN.
TURNING
A
VANES
BAFFLE
toP vieW