Reznor SHH (Indoor PreevA) Unit Installation Manual - Manual (Page 48)

Form I-PDH/SDH/PEH/SHH/PXH, Page 48
7.5.5 Door Switch,
Model SDH and SHH
All Model SDH and SHH heaters are equipped with a door switch which prevents the
heater from operating when the heat section door panel is open. The door is equipped
with a tubular core gasket that fully seals to provide added protection from building air
entering the combustion zone of the heater.
7.5.4 Blower Motor (PDH, SDH, PXH, SHH, PEH) and Venter Motor
(PDH, SDH, SHH)
Use an ammeter to check blower motor amps. Amps may
be adjusted downward by reducing blower RPM or by
increasing duct system static pressure (Paragraph 6.7.2).
TABLE 32 lists full load amps of open-type blower motors
by HP and voltage. This chart can be used for sizing line
wiring but should not be interpreted as the exact motor
amps. See the motor rating plate for exact motor specifica-
tions. Do not exceed amp rating on the motor nameplate.
Venter motor amps for a 115 volt or 575 volt unit are 1.5
amps; venter motor amps for a 208, 230, or 460 volt unit
are .8 amps.
TABLE 32 - FLA of Single Speed, Open
Dripproof, Blower Motor
7.5.6 Condensate
Drain Pressure
Switch, Model SHH
All Model SHH heaters are equipped with a condensate drain pressure switch. If the
secondary heat exchanger condensate drain is blocked causing the sensing pressure
to be outside the switch setpoint, the pressure switch will function to shutoff the gas
valve. The burner will remain off until the problem is corrected.
7.5.8 Electric Heating
Elements - PEH
Electric heating modules in Model PEH are made up of two to six 5kw or three to twelve
10 kW heating elements depending on size and voltage of the unit. The elements are
bracketed together to make up the electric heat section assembly.
7.5.7 Vent
Temperature Limit
Switch, Model SHH
All Model SHH heaters are equipped with a temperature activated, manually reset
switch to limit the temperature of the vent gases to below 145°F. The switch is attached
to the side of the combustion air venter housing. If the setpoint is reached, the switch
will interrupt the electric supply to the gas valve. If the vent temperature switch is acti-
vated, identify and correct the cause before resetting the switch. Refer to the Mainte-
nance Section in Form O-PREEVA for information on probable causes and instructions
on resetting the switch.
DANGER
If the manual vent temperature switch activates, identify and correct the cause before
resetting the switch. Never bypass the vent temperature switch; hazardous conditions
could result. See Hazard Intensity Levels, page 2.
FIGURE 41 - Electric Heat
Section - Model PEH
Electric Heat Assy
Fuses
Distribution Block
Relay Transformer
Main
Electrical
Box
Discharge
Airflow
Staging Board used in
Control Option D12D
(see Paragraph 8.3.2)
FX06 Controller
Transformer(s)
Contactor(s)
Example of one
of the Electric
Heating Elements
in the Electric Heat
Assembly
7.5 Electrical Operating Components (cont’d) 7.0 Electrical
Supply and
Wiring (cont’d)
Full Load Amps - Blower Motor (Open)
(Single Speed- Average Values)
HP 1/4 1/3 1/2 3/4 1 1-1/2 2 3 5
115V 1PH 4.6 6.0 8.8 11.0 13.0 15.0 24.6 N/A N/A
208V 1PH 2.3 3.0 5.1 5.5 7.5 7.8 12.3 13.7 25.5
230V 1PH 2.3 3.0 4.4 5.4 6.5 7.5 12.3 12.4 23.0
208V 3PH 1.1 1.9 2.5 2.9 4.0 5.6 7.0 9.0 13.4
230V 3PH 1.4 1.6 3.0 2.6 3.7 5.0 6.6 8.6 13.2
460V 3PH 0.75 0.8 1.5 1.3 2.0 2.8 3.5 4.3 6.6
575V 3PH N/A N/A 0.9 1.0 1.4 2.0 2.6 3.6 5.4