Reznor MAPS II Unit Installation Manual - Manual (Page 53)

Form I-MAPS II, P/N 206131 (Rev 13), Page 53
Startup Cooling
Sequence when
ambient temperature
is ABOVE 68°F/20°C
10.3.1 Startup Checklist for ALL Systems
Assumptions: All prior to startup checks have been completed satisfactorily.
Compressors with crankcase heaters have been allowed to warm up for at
least 24 hours.
Reference: See one-page Startup Form in Paragaph 10.5, page 57. Form is
also available on line at www.RezSpec.com.
c) Observe gas meter for movement, or
d) Attach pressure gauge readable to 0.1" w.c. and after turning gas on for
ten seconds, turn gas supply off. No change in pressure should occur
over a three-minute period.
e) If either c) or d) above indicate a leak, locate leak by brushing a soapy
solution on all fittings. Bubbles will appear at the leak. Repair and
repeat tests.
 Check to make sure that the combustion air inlet and flue discharge open-
ings are free of obstructions.
When all checks are completed satisfactorily, close and secure all doors.
10.3 Checklist -
Startup
 If there is a furnace section, turn on the gas.
 Adjust the system controller so that a call for cooling exists. Observe for
complete sequencing.
Sequence of Cooling Operation when ambient temperature is ABOVE
68°F/20°C (all Models):
NOTE: Outdoor ambient lockouts may prevent mechanical cooling or reheat.
Temporarily override lockouts by lowering the oC1 programmable control
setting to 58°F. To enable unit reheat functions, temporarily lower the DP1
setting to 50°F. When testing is complete, reset oC1 or DP1 as required by
the application. (For instructions on changing settings on the programmable
control, refer to the instruction sheet for the control system shipped either in
the Literature Bag or with the Wiring Diagram.)
1. Set control switch at Auto position (closed).
A) Energizing the blower motor and, if equipped, the damper motor.
B) Air proving switch closes, allowing for heating, cooling, or reheat
mode.
1) On temperature rise above outside air setting for cooling
a) Energizing the re-heat pump circuit after minimum time delay
(RDA, RDDA, REDA).
b) Cooling rate is controlled by discharge air sensor.
c) On call for cooling, the corresponding compressors and con
denser motors are energized.
d) On low humidity or abnormal temperature, the re-heat heat pump
is de-energized (RDA, RDDA, REDA).
e) On abnormal temperature, the corresponding cooling circuit is
de-energized.
2) On temperature drop below changeover setting, the cooling circuit
is de-energized
2. For shutdown, set control switch at OFF position (open).