Full Product Manual

IHR Series Manual
16 17
Electrical Requirements and Wiring Diagrams
All field installed wiring to the unit heater must be must be done in accordance with the national, state,
provincial, local codes, and to the guidelines in this manual. In the United States, refer to the most current
revisions to the Electrical Code ANSI/NFPA 70 and in Canada refer to the most current revisions to the
Canadian Electrical Code CSA C22.1 Part 1. The unit must be electrically grounded according to these
codes. Line polarity must be observed when making field connections.
Before proceeding with electrical connections, ensure that the supply voltage, frequency, phase and
current capacity meet the requirements specified on the rating plate. A dedicated line voltage supply with
properly sized wire should run directly from the main electrical panel to the heater. The power to the unit
must be protected with a circuit breaker appropriate for the load. The unit must be electrically grounded
in accordance with local codes, or in their absence, with the latest edition of the National Electrical Code,
ANSI / NFPA 70 and/or the Canadian Electrical Code CSA C22.1, latest edition.
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.
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 Figure 2.6 below. It is recommended that the thermostat be
installed on the hot side of a fused supply line and have sufficient ampere capacity rating for the heater(s)
it will control. The ventilation system may not be controlled separately from the heating system (consult
local codes) by the use of a humidistat that closes then 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.
Figure 2.6 • Typical Field Wiring
2.0 Installation • Electrical Requirements and Wiring Diagrams
The power supply to the heater must be within +/- 5% of the voltage rating as indicated on the rating
plate of the appliance. If input power does not meet these specifications, contact your utility company.
CAUTION
!
Thermostat
Hot
Neutral
Exhaust
Fan
IHR Series
Heater
Transformer
(required on
24V heaters)
IHR Series
Heater
IHR Series
Heater
WARNING
!
Shock hazard. Disconnect power supply before making wiring connections to prevent
electrical shock and equipment damage. Any original factory wiring that requires replacement
must be replaced with wiring material having a temperature rating of at least 105°C.