Reznor RECC Unit Installation Manual - Manual (Page 68)

Form I-MAPSIII&IV, Page 68
The installation must obtain a temperature rise within the range specified on
the furnace rating plate. Maximum temperature rise for this unit is 100°F.
CFM = (Input rate x .80) divided by (1.08 x temperature rise)
1. Set the discharge temperature heating control at its lowest setting.
a) Firing rate is controlled by the discharge sensor.
b) Blower motor operation is continuous.
2. On a call for gas heat
a) The venter motor is energized after 18-second (approximate) time
delay.
b) Combustion air pressure switch switches from N.C. to N.O. contacts,
firing unit. The sensing probe proves the presence of the flame at the
1st burner section.
3. If the flame is extinguished during burner operation, the ignition system circuit
board closes the main valve and must be reset by interrupting the power to the
control circuit (See Lighting Instructions on the furnace).
 Turn the unit off and on, pausing two minutes between each cycle. Observe for
smooth ignition.
Manipulate discharge temperature setpoint up and down to see if furnace is
staging or modulating properly. NOTE: Be sure control is returned to proper
settings.
 Close all panels tightly. With the heater on, check limit control by completely
blocking off distribution air. The limit control should open within a few minutes,
shutting off the gas supply to the burner.
10.0 Commissioning and Startup (cont'd)
10.3 Checklist
Startup
(cont'd)
10.3. 2 Startup Checklist for Systems with Gas Heat Module (cont'd)
DANGER
The gas burner in the optional gas-fired heat section is designed to provide safe,
complete combustion. However, if the installation does not permit the burner to
receive the proper supply of combustion air, complete combustion may not occur.
The result is incomplete combustion which produces carbon monoxide, a poisonous
gas that can cause death. NEVER RESTRICT OR OTHERWISE ALTER THE SUPPLY
OF COMBUSTION AIR TO ANY HEATER.
DANGER
Safe operation of indirect-fired gas burning equipment requires a properly operating
vent system which vents all flue products to the outside atmosphere. FAILURE TO
PROVIDE PROPER VENTING WILL RESULT IN A HEALTH HAZARD WHICH COULD
CAUSE SERIOUS PERSONAL INJURY OR DEATH.
□
Setting the Supply and Exhaust Fans - If the energy recovery module is not
equipped with optional variable frequency drives (Options EFD1 and SFD1), it is
recommended that the air balance procedures outlined below be performed.
Instructions for MAPS® Unit with an Energy Recovery Module
1. Perform Air Balance Procedure on the MAPS ® Unit
a) In order to measure airflow without the pressure drop of the energy recovery
module, open the coil access door. (See FIGURE 15, page 30.)
b) Energize the MAPS ® blower system circuit only. Balance the air to the
specific air volume requirements for the application. (If blower speed requires
adjustment, follow the instructions in Paragraph 6.6.2.)
c) De-energize the MAPS ® blower system circuit. Close and lock the coil access
door.
10.3.3 Startup Check
for MAPS ® Unit with
an Energy Recovery
Module, Option ER1