HTP Elite FT Series User Manual

LP-387 Rev. 011 Rel. 005 Date 1.3.19
48
Ensure the boiler is full of water before ring the burner. Failure
to do so will damage the boiler. Such damage IS NOT covered by
warranty, and could result in property damage, severe personal
injury, or death.
3. Fill condensate trap with water.
4. Verify electrical connections are correct and securely attached.
5. Inspect exhaust vent and intake piping for signs of deterioration
from corrosion, physical damage or sagging. Verify exhaust vent and
intake piping are intact and correctly installed per Venting Section
and local codes.
I. Setting Up a Single Boiler
When power is applied to the boiler, the control rst completes a
power-up systems check. During this time the combustion fan
may run. The display will initially show the current boiler supply
temperature. If a fault is detected during the power-up test, the
control will display the appropriate fault code. Otherwise, the
display will continue to show the boiler supply temperature and
stand-by, waiting for a demand for heat.
When a demand for heat is received, the control begins the following
demand sequence. The boiler rst turns on the pump. The control
will measure the supply temperature. If it is below the set point
temperature minus the ignition dierential the control will ignite
the burner.
After the burner is lit, the control modulates the ring rate to control
the supply water temperature and meet the heat demand. When the
thermostat or indirect water heater temperature is met, the control
will extinguish the burner and run the combustion fan to purge
gasses from the combustion chamber. In addition, the pump will run
for a pump post purge interval. The control will then be in standby,
waiting to process the next demand for heat.
During this process, the control will extinguish the burner if it senses
a dangerous or unsafe condition. If the control determines that a
dangerous or unsafe condition has occurred, the control may lock
out the boiler and prevent it from igniting until a maintenance
person diagnoses the problem, repairs it, and resets the control. In
the event that the control goes into lockout, it will show a diagnostic
code on the display, illuminate the LED fault indicator, and close the
alarm relay contacts to aid in recognition of the condition, diagnosis,
and repair.
J. Setting Up a Cascaded System
If the boiler is part of a cascaded system the operation is somewhat
dierent. The control of each boiler in a cascaded system completes
its own power up system check. One of the boilers in the cascade
system is designated as the master boiler. After the master boiler
completes its power up sequence, it checks the communication bus
to see if any other boilers are present. If other boilers are present,
the master control determines these follower boiler addresses. The
master boiler control will recheck the bus every few seconds as long
as it is powered up to update the status of the connected boilers.
The control in the master boiler processes all heat demands and
dictates which of the follower boilers should light and what ring
rate the followers should try to achieve.
When the master boiler receives a demand for heat, it determines
which boiler is rst in the ring sequence and sends that boiler a
command to begin a demand sequence. That boiler will then begin
a demand sequence as described above. Once the boiler ignites,
the master boiler control will increase the ring rate command to
that boiler until the system sensor temperature is at the set point
temperature plus the dierential, or that boiler is at high ring rate.
If the command from the master boiler control gets to the high
ring rate of the follower boiler, but the system sensor is below the
2. Verify the boiler and system are full of water and all system
components are correctly set for operation.
required temperature, the master boiler control will then tell the next
boiler in the ring sequence to begin its demand sequence. The master
boiler control will then begin to ramp up the ring rate command of
that boiler. This process will continue while there is a demand until all
boilers in the cascade system are at high re or the desired temperature
of the system sensor is reached. If the system sensor temperature
reaches tank set point and dierential before all boilers are at high
re, the master control will modulate the cascade command signal
to maintain the system sensor at set point and dierential until the
demand is complete. When the system sensor is equal to the set point
temperature, demand is complete, and the master boiler control will
extinguish all boilers that may be lit. If the demand decreases, the
ring rate command and amount of boilers lit will decrease exactly
opposite as described above.
Whenever the master boiler control needs to re a follower boiler, it
sends a ring rate command to that boiler. The follower boiler will
respond to the command until its supply sensor temperature gets
to be 5
o
F above the set point temperature plus the dierential, at
which point the individual boiler will modulate on its own so as not
to overheat. As a result, it is not uncommon to see the cascade output
at maximum but individual boilers ring at less than their maximum
ring rate.
K. Lockout Condition
If any boilers, including the master boiler in the cascade system, are
in a lockout condition, the master control will recognize the lockout
condition and skip over the boiler in the ring sequence. Each boiler
in the cascade system is responsible for its own safety functions.
So, if any individual boiler control senses an unsafe condition, it will
extinguish the burner and, if necessary, go to a lockout condition. In
this way, every boiler in the system has its individual safety controls
intact and operational, even if the ring of the boiler is under control
of the master boiler.
In the event that the system sensor fails, all boilers in the system will
ignite simultaneously when there is a demand, and each boiler will
individually regulate ring rates to maintain the master set point
temperature (supply temperature set point + dierential) at the
individual supply sensors built into the boiler. If this should happen,
the master boiler will display an E03 fault code, indicating that the
supply sensor has failed.
L. Cascade System Programming
1. If the boiler is used alone, skip this section.
2. Programming the Master Boiler:
a. Make sure there is no demand for heat being supplied to the
boiler.
b. Apply power to the boiler.
c. Enter the system setting program navigation following
instructions in Part 10 of this manual.
d. Verify that cascade address function 15 is set to 0. This makes
the master boiler address 0. NOTE: The Master Boiler MUST be
addressed as 0.
e. Change Cascade Mode function 23 to 926 Boilrs. This makes it
the master boiler.
f. Exit the installer menu.
NOTE: The temperature set point of the master must match the
follower boiler set point in order for the system to operate properly.
3. Programming Follower Boilers:
NOTE: READ THE NOTES BELOW BEFORE PROGRAMMING
FOLLOWER BOILERS
• The boiler addressed as 1 will share its alarm output with the
master boiler.
• If one of the follower boilers has an indirect red water heater
connected to it, the address of this boiler must be 2 or greater.
• It is recommended but not necessary to address boilers in the
order that they are wired.
• No two boilers can have the same address.
• It is not required to use all consecutive address numbers.

HTP Elite FT Series Specifications

General

Brand	HTP
Model	Elite FT Series
Category	Boiler
Language	English