Table of Contents
Advertisement
OPERATION
10 MINS.
90%
8 MINS.
IGNITION
(80%)
70%
60%
50%
2 MINS.
MIN.
Operation with Conventional 2-Stage Thermostat
(DIP switch selects 2-stage heat)
Call for 2nd-Stage Heat - Thermostat contacts close R to
W1 and W2.
After a successful Light Off Sequence and expiration of the
Ignition Stabilization Period:
•
The IFC adjusts to the low firing rate.
•
After 2 minutes, the IFC increases to 80%.
•
Thereafter, the IFC will increase 10%, at a rate of 1%
per second, every 10 minutes for the remainder of
the call for heat.
•
The circulator is adjusted to the appropriate CFM,
corresponding to the current firing rate.
UNIT CALL FOR HEAT ENDS
100%
IGNITION
(80%)
78%
50%
O P E R A T I O N
CALL FOR
2ND STAGE HEAT
2 MINS.
MIN.
Call for 2nd-Stage Heat with 1st-Stage call for heat call in
progress, with conventional 2-Stage Thermostat.
•
The IFC increases the firing rate to 100% at a rate of
1% per second for the remainder of the W2 call.
•
The circulator is adjusted to the appropriate CFM,
corresponding to the current firing rate.
Call for 2nd-Stage Heat satisfied; Call for 1st-Stage Heat
remains.
•
The IFC remains at the current firing rate until the
1st-Stage call for heat is satisfied.
H
O
CTK01 T
(C
-
EATING
PERATION WITH
HERMOSTAT
OMMUNI
)
CATING
•
When the Thermostat Heat Setup DIP switch is set to
2-Stage heat, the IFC operation will be compatible
with a CTK01communicating thermostat.
•
When a call for heat is sent, the furnace will go through
the Light Off Sequence, After the successful Light
Off Sequence and expiration of the Ignition Stabili-
zation Period:
•
The IFC adjusts to the low firing rate.
•
After 2 minutes, the IFC accepts the specific Heat
Requested Demand.
•
If the differential is equal to or less than 2 degrees,
the IFC will follow the conventional 2-Stage algorithm,
equivalent to a W1 request..
•
If the heat differential is greater than 2 degrees, the
IFC will follow the conventional 2-Stage algorithm,
equivalent to a W2 request.
•
The circulator will operate per the heat airflow pro-
file.
H
O
CTK02**, CTK03 & CTK04
EATING
PERATION WITH
T
(M
C
)
HERMOSTAT
ODULATING
OMMUNICATING
•
When the Thermostat Heat Setup DIP switch is set to
1-Stage heat, the IFC operation will be compatible
with a modulating communicating thermostat
(CTK02**).
•
When a call for heat is sent, the furnace will go through
the Light Off Sequence, After the successful Light
Off Sequence and expiration of the Ignition Stabili-
zation Period:
•
The IFC adjusts to the low firing rate.
•
After 2 minutes, the IFC accepts the specific Heat
Requested Demand.
•
If the differential is 2 degrees or less, the Heat Cur-
rent Demand Status will show 50%.
•
If the specific Heat Requested Demand is above 2
degrees, the Heat Current Demand Status will track
the specific Heat Requested Demand.
•
The circulator will operate per the heat airflow pro-
file.
D
T
P
RAIN
RAP
RIMING
The drain trap must be primed prior to furnace startup. To
prime, fill the drain trap with water. This ensures proper fur-
nace drainage upon startup and prohibits the possibility of flue
gases escaping through the drain system.
Page 34
Hide quick links:
Advertisement
Chapters
Table of Contents
