Install Instructions
12
6-580.5
All units include the standard (STD) features. The unit must be
reviewed to determine the optional (OPT) features that may
have been supplied with the unit.
(1) Gas Valve
a) Single Stage Gas Valve - (STD)
The main gas valve provides the pilot, regulator, main gas,
and manual shutoff functions. For additional information,
see the supplier literature included with the unit.
b) Two Stage Gas Valve - (OPT)
The two stage gas valve provides the pilot, regulator, main
gas (100% and 50% fire), and manual shutoff functions.
For additional information, see the supplier literature
included with the unit.
(2) Ignition controller - (STD)
The ignition controller is factory installed on the back of the unit
heater with the spark igniter and sensor located on the burner.
For additional information, refer to "Control Operating Sequence"
on page 11 and the supplier literature included with the unit.
(3) Time Delay Relay - (STD)
The time delay relay is factory installed in electrical junction
box and controls propeller/blower motor function. For single-
phase units below 2 Hp, the time delay relay controls the motor
directly. For single-phase units 2 Hp and greater and all three
phase units, the time delay relay controls the motor starter. For
additional information, refer to "Control Operating Sequence"
on page 11.
(4) Low Voltage Terminal Board - (STD)
The low voltage terminal board is located in electrical junction
box. The terminal board is labeled to match the electrical
wiring diagram provided with the unit. All low voltage field
wiring connections should be made to the exposed side of the
terminal board (exterior of electrical junction box) to prevent
miswiring by modifying the factory wiring which is inside the
electrical junction box.
(5) Control Step Down Transformer - (STD)
The control step down transformer is located in the electrical
junction box. The transformer is used to step down the supply
power (115V, 208V, 230V, 460V, 575V) to 24V. This transformer
is used to control the gas controls, fan delay relay, field
supplied motor starter, etc. All unit heaters are supplied with a
40VA control step down transformer. To determine the control
transformer supplied as well as any accessory/field supplied
transformers required reference the supply voltage listed on the
serial plate and reference Tables 13.2 and 13.3.
(6) High Limit Switch - (STD)
The automatic reset high limit switch is factory installed on
the left side (air blowing at you) of the unit heater. If the limit
temperature is exceeded, the gas controls are de-energized
until the switch is cooled.
(7) Pressure Switch (STD)
A automatic reset vent pressure switch is designed to prevent
operation of the main burner if there is restricted venting of
flue products. This restriction may occur due to an improper
vent diameter, long vent runs, un-approved vent terminal, high
winds, high negative pressure within space, etc. After the cause
of the restriction has been corrected, the pressure switch will
reset automatically. See Troubleshooting section for more
information.
(8) Power Exhauster (STD)
All power vented unit heaters are supplied with a round vent
pipe connection. Some models may require the use of a vent
transition from the power exhauster outlet to the vent pipe (see
Table 6.1). The power exhauster may be rotated 180° to allow
for various venting directions.
(9) Blower Motor - (STD on BDP models only)
The blower motor can be provided in a variety of supply
voltages and motor horsepowers. Refer to the model
nomenclature to determine the motor provided. The blower
motor is supplied with an adjustable sheave that can be used
to increase/decrease the blower RPM. For instructions on
changing the blower RPM, refer to Blower Adjustments.
12
UNIT AND CONTROL OPTIONS
➀
➁
➂
➃
➄
➈
⑥
➆
Figure 12.1 - Factory Mounted Option Location
➇
Table 12.1 - Control Descriptions - Models PDP and BDP
➀ All controls are intermittent pilot ignition, 100% shut-off with continuous retry.
➁ Factory wired 460/575 available on blower models. Field installed step down
transformer may be used for 460/575 propeller applications.
Single-Stage
➀
30
31
32
33
85
86
93
94
115V
208/230V
460V ➁
575V ➁
87
88
25V
25V
25V
25V
25V
25V
Control System
Description
Control Code
Natural
Gas
Propane
Gas
Service
Voltage
Thermostat
Voltage
Two-Stage
➀
63
64
115V
208/230V