Wiring Guide

ii
Wiring Diagram Selection
A. Field and Submittal Wiring Diagram Selection
Wiring in the field changes little when the brand of the
controls furnished on the unit heater changes. Select correct
wiring diagrams as follows:
1. Determine unit heater model and size.
2. Select control code number from Table 1.
3. Reference unit heater model in the Page Location Index
with control code number and determine correct page
number for single-phase or three-phase control. Single-
phase wiring diagram page numbers are in the upper left
of box and three-phase diagrams are in the lower right of
box.
4. Wiring diagrams for unit heater accessories are listed in
Table 2. Use the accessory diagrams along with the unit
wiring diagrams for complete wiring instructions.
B. Service and Troubleshooting
Because internal or factory wiring may vary depending
on controls manufacturer, the wiring diagrams must be
selected with the series identity number when servicing
or troubleshooting a unit heater control system. Wiring
diagrams in this bulletin are for unit heaters manufactured
after June 2003 and the series identity number is the 5th
thru the 7th digits of the unit heater serial number.
EXAMPLE: Serial No. – 01121010697 has a series identity
number of 101.
To select the correct wiring diagram:
1. Determine unit heater model and size from serial plate
located on the side of the unit.
2. Determine the control code numbers from box marked
Control Code, also on the serial plate.
3. Determine the series identity number of the unit heater,
then proceed with Step 3 of Field and Submittal Wiring
Diagram Selection.
Example Selection
Select correct single-phase wiring diagram for a PDP175A
Control Code 11, series identity number 101.
Locate the Page Location Index which shows the page numbers
for PDP and BDP units with series identity number 101 (see
page iii). Select the page number where the column for the
PDP175 intersects with the line for control code 11. The correct
single phase wiring diagram for this unit is found on page 1 in
the upper left portion of box. If the unit also had a summer/winter
switch the accessory wiring diagram found on page C-2 as per
Table 2, would also be required for complete wiring information.
Two-in-one Diagrams
Two wiring diagrams are furnished for each circuit configuration
in this manual. Included are a connection diagram at the left
for field installation and circuit schematic at the right to aid in
continuity and trouble shooting.
The heavier lines in the connection diagram indicate line voltage;
the lighter lines indicate low voltage. Solid lines show pre-wiring
performed at the factory; dotted lines inform the installer of
connections required to put the heater in operation.
Table 1
Control Code Descriptions
Control Code
Number Description
11,12,13,14 Single-Stage, Standing Pilot, 100% Shut-Off, Natural Gas
81,82,91,92 Single-Stage, Standing Pilot, 100% Shut-Off, Propane Gas
25,26 Two-Stage, Standing Pilot, 100% Shut-Off, Natural Gas
83,84 Two-Stage, Standing Pilot, 100% Shut-Off, Propane Gas
30,31,32,33 Single-Stage, Intermittent Pilot Ignition, 100% Shut-Off with Continuous Retry, Natural Gas
85,86,93,94 Single-Stage, Intermittent Pilot Ignition, 100% Shut-Off with Continuous Retry, Propane Gas
59,60 Mechanical Modulation with Automatic Pilot Ignition, Non-100% Shut-Off, Natural Gas, BDP Only
89,90 Mechanical Modulation with Automatic Pilot Ignition, Non-100% Shut-Off, Propane Gas, BDP Only
63,64 Two-Stage, Intermittent Pilot Ignition, 100% Shut-Off with Continuous Retry, Natural Gas
87,88 Two-Stage, Intermittent Pilot Ignition, 100% Shut-Off with Continuous Retry, Propane Gas
Table 2
Accessory Wiring Diagram Page Location Index
Page Accessory
C-1 Energy-Saver Kit
C-2 Summer/Winter Switch
See paragraph A, step 4 under “Wiring Diagram Selection”.
6-446 — MODELS PDP/BDP