Detroit Radiant Products Company DR Series - Manual (Page 17)

DR Series Manual
16 17
2.0 Installation • Electrical
WARNING
!
Electric Shock
Field wiring to the heater must be connected and grounded in accordance with national,
state, provincial, local codes and to the guidelines in the this manual. In the United States
refer to the most current revisions to the ANSI/NFPA 70 Standard and in Canada refer to the
most current revisions the CSA C22.1 Part I Standard.
Control systems are initiated by either 120 VAC, 24 VAC or millivolt energy. The 120 VAC systems can be
used directly from a 120 VAC line. On 24 VAC systems, transformers
must be used to supply power of
sufficient VA rating for single or multiple connected installations.
Important! Proper grounding and polarity are essential for heaters with spark ignition controls. If the
system is not properly grounded, it cannot determine the presence of a flame and will lockout and shut off.
Millivolt systems require NO external power, as energy needed to operate the valve is developed by the
power-pile generator. Do not use multiple connections, as one thermostat may only control one heater.
For wiring of controls on the unit see the wiring diagram included on page 18. It is recommended that the
thermostat be installed on the hot side of a fused supply line and have a sufficient ampere capacity rating
for the heater(s) it will control. The ventilation system may be controlled separately from the heating
system (consult local codes) by the use of a humidistat that closes when the humidity rises. The
humidistat control should be installed at roof level. For summer ventilation, a simple on/off switch can be
installed at the occupant level.
Electrical
Thermostat
Hot
Neutral
Exhaust
Fan
DR Series
Heater
DR Series
Heater
DR Series
Heater
Figure 2.7 • Typical Field Wiring
Transformer
(required on
24V heaters)