Rheem Raypak Hi Delta H Series Installation & Operating Instructions Manual page 42

f. For systems with CWP enabled, the MIX out-
put is released to its control point based on
distance from Inlet temperature target.
g. When power is sent to the first gas valve it is
also used to energize the stage module, which
also receives a proportional signal generated
by the PIM that will stage the firing rate based
on the calculated heat demand.
h. The proportional signal will determine the
exact time when the 2nd Stage relay is activat-
ed. At the moment of activation a Time Delay
Relay 1 (TDR-1) will be energized, which
starts a 5-sencond countdown.
i. After the 5-second countdown TDR-1 ener-
gizes Gas Valve 2 and provides power on one
side of the Stage 3 relay dry contact (NO).
j. The proportional signal will determine the
exact time when the 3rd Stage relay is activat-
ed. At the moment of activation a Time Delay
Relay 2 (TDR-2) will be energized, which
starts a 5-sencond countdown.
k. After the 5-second countdown TDR-2 ener-
gizes Gas Valve 3.
l. (1262C) When Gas Valve 3 activates, power
is also provided on one side of the Stage 4
relay dry contact (NO).
m. (1262C) The proportional signal will determine
the exact time when the 4th Stage relay is
activated, at the moment of activation a Time
Delay Relay 3 (TDR-3) will be energized,
which starts a 5-sencond countdown.
n. (1262C) After the 5-second countdown TDR-3
energizes Gas Valve 4.
22. If flame is not detected during the trial-for-ignition
period, the gas valve output is disabled immedi-
ately and the blower goes to post-purge.
23. 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.
On multi-trial-for-ignition models, the control goes
through an interpurge delay before additional ignition
attempts are started. If no flame is detected after the
final trial-for-ignition, 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.
Models 1532C-2342C
1. Upon initial application of 24VAC power, the PIM
resets with all outputs in the "OFF" state.
2. The Primary PIM and VERSA IC Control perform
a processor and memory self-test to ensure prop-
er operation.
3. The Primary PIM and Secondary PIM confirm the
presence of a valid ID Card which matches the
configuration stored in memory at the factory. If
valid ID Cards are NOT present, the individual
PIM generates a diagnostic fault and will shut
down waiting for this fault to be addressed.
4. The Primary PIM reads the DIP switch settings
and configures itself for the desired operation.
5. The Primary PIM scans the Ft_bus communica-
tions for the VERSA IC Control and if found,
system operation is controlled by the VERSA IC
Control. Additionally the Primary PIM, once con-
firmed the Dual PIM configuration by the ID card,
scans for the Secondary PIM. If not found, the
system generates a diagnostic fault and will pro-
ceed operation with the available capacity.
6. Non-volatile memory is checked for any active
lockout conditions. If any exist, they must be
addressed before the Primary PIM will allow a
new trial for ignition to start.
7. The Primary PIM and Secondary PIM continually
monitor the flame status to ensure that no flame is
present during standby. If an erroneous flame is
detected, the individual PIM generates a False
Flame error fault.
8. A Call-for-heat is initiated by the presence of any
one or more of the 4 sources below:
a. A heat demand (contact closure) on the TH
field wiring terminals.
b. A voltage greater than 0.5 VDC on the analog
0-10 VDC EMS signal input.
c. A heat demand present on the DHW field
wiring terminals.
d. A heat demand from the VERSA IC control
based on the DHW sensor temperature.
9. The Primary PIM initiates a trial for ignition count-
er to the programmed number of trials for ignition
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