Controls - Rheem Raypak Hi Delta P902C Installation & Operating Instructions Manual

e. The flame sense is checked for successful
lighting of the burner. If a valid flame is detect-
ed, the main gas valve, operating pumps and
blower relay remain energized and the PIM
proceeds to the Heating mode.
f. For systems with CWP enabled, the MIX out-
put is released to its control point based on
distance from Inlet temperature target.
g. (902C) When power is sent to main gas valve
it is also sent to Time Delay Relay 1 (TDR-1),
which starts a 5-sencond countdown.
h. (902C) After the 5-second countdown from
TDR-1, which closes stage 1A contacts ener-
gizing Gas Valve 1A.
i. The second stage will be triggered by the PIM
using the second relay build into the PIM hard-
ware (J14- 2, 5).
23. If flame is not detected during the trial-for-ignition
period, the gas valve output is disabled immedi-
ately and the blower goes to a post-purge.
24. On single trial-for-ignition models, the PIM enters
ignition lockout and the LED on the PIM indicates
the fault code for ignition lockout. The VERSA IC
Display should also state Ignition Lockout.
25. On multi-trial-for-ignition models, the control goes
through an interpurge delay before additional igni-
tion attempts are started. If no flame is detected
after the final trial-for-ignition, the PIM enters igni-
tion lockout and the LED on the PIM indicates the
fault code for ignition lockout. The VERSA IC
Display should also state Ignition Lockout
Freeze Protection
To enable freeze protection, DIP switch position 7 (on
the PIM) must be turned on (UP position). This is the
default position.
If the water temperature drops below 45˚F on the
Outlet or Inlet sensors, the Boiler pump is enabled.
The pump is turned off when both the Inlet and Outlet
temperatures rise above 50˚F.
If either the Outlet or Inlet temperature drops below
38°F, the VERSA starts the burner at the minimum fir-
ing rate. The burner cycle will terminate when both the
Inlet and Outlet temperatures rise above 42°F.

Controls

WARNING: Installation, adjustment and service of
heater controls, including timing of various operating
functions, must be performed by a qualified installer,
service agency or the gas supplier. Failure to do so
may result in control damage, heater malfunction,
property damage, personal injury, or death.
WARNING: Turn off the power to the heater before
installation, adjustment or service of any heater
controls. Failure to do so may result in board
damage, heater malfunction, property damage,
personal injury, or death.
CAUTION: This appliance has provisions to be
connected to more than one supply source. To
reduce the risk of electric shock, disconnect all such
connections before servicing.
CAUTION: Risk of electric shock: More than one
disconnect switch may be required to de-energize
the equipment before servicing.
Ignition Control Functions
When there is a call for heat, and all safeties are
closed, then the combustion air blower starts to purge
air from the combustion chamber. After the pre-purge,
the igniter is energized. The standard ignition module
will lock-out after failing to light 3 times during a call for
heat. To reset the lock-out, press and release the
RESET button located on the user interface. The con-
trol will automatically reset after 1 hour. When in
lock-out the control will run the blower through a post-
purge cycle.
The single-try ignition module (part of the CSD-1
option) will attempt to light only one time before lock-
out occurs. To reset the lock-out, press and relase the
RESET button located on the user interface.
Turning off the power to the heater WILL NOT reset
the single-try ignition module.
42