Detroit Radiant Products Company QTD Series - Manual (Page 29)

QTD Series
29
The heater must be electrically grounded in accordance with the following codes:
United States: Refer to National Electrical Code ® , ANSI/NFPA 70 (latest edition). Wiring must
conform to the latest edition of the National Electrical Code ® , local ordinances, and
any special diagrams furnished.
Canada: Refer to Canadian Electrical Code CSA C22.1 Part 1 (latest edition).
3.0 Installation • Electrical Requirements • Thermostat
Electrical Requirements
NOTICE
• 120 Volt - 60 Hz GRD, 3-wire.
• 24VAC thermostat connection.
• Starting current 1.5 amps.
• Running current 1.1 amps.
The QTD Series comes standard with internal isolation relays. 24 VAC must be supplied to each heater’s
yellow control cord. The burner control box is equipped with a six (6) foot yellow 24V control wire. Do not
supply 120V to the 24V connection.
NOTE: Heater also comes with a DPDT Switch to allow for alternate operation of unit. (Located inside
Service Access Panel). The alternate operation of the unit allows the internal transformer to send out
power for a thermostatic connection. (No external transformer necessary). When this configuration is
selected, the heater will supply 24VAC out on the green control wire.
When heater is set up for the alternate operation, DO NOT supply an external supply of 24 volts. Damage
could result to the Dual Pole Isolation Relay.
This configuration can only be utilized on a ‘single heater to thermostat’ type operation. For further
information, see figure 3.21, Alternate field wiring diagram for Single unit operation with a 24VAC control.
The 120V supply connection is factory wired with a three-prong pig tail.
Refer to Field Wiring Diagram (see Figure 3.20).
WARNING
!
Improper installation, adjustment, alteration, service or maintenance can cause property
damage, serious injury or death. Read and understand, the installation, operating and
maintenance instructions thoroughly before installing or servicing this equipment. Only
trained, qualified gas installation and service personnel may install or service this
equipment.
Not for residential use! Do not use this heater in the home, sleeping quarters, attached
garages, etc. Installation of a commercial tube heater system in residential indoor spaces
may result in property damage, serious injury or death.
Thermostat
NOTE: Different thermostats operate according to their particular features. Refer to thermostat
specifications for details.
QTD Series heaters require a 24V, two-stage thermostat to operate. The burner control box is equipped
with a yellow 24V control wire.
Do not supply 120V to the 24V connection.