Heating Operation With Ctk01 Thermostat (Communicating); Heating Operation With Ctk02**, Ctk03** & Ctk04** Thermostat (Modulating Communicating); Condensate Drain Trap Priming; Furnace Operation - Amana MVM97 Installation Instructions Manual

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 furnace control board adjusts to the low firing
rate of 35%.
• After 2 minutes, the furnace control board increases
the firing rate to 80%.
• Thereafter, the IFC will increase the firing rate by
10%, at a rate of 1% per second, every 10 minutes for
the remainder of the call for heat.
• The circulator fan is adjusted to the appropriate CFM,
corresponding to the current firing rate.
Call for 2nd-Stage Heat with 1st-Stage call for heat call in
progress, with conventional 2-Stage Thermostat.
• The furnace control board 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.
100%
IGNITION
(80%)
78%
50%
2 MINS.
MIN.
Call for 2nd-Stage Heat satisfied; Call for 1st-Stage Heat
remains.
• The furnace control board remains at the current fir-
ing rate until the 1st-Stage call for heat is satisfied.
Heating Operation with CTK01 Thermostat
(Communicating)
• When the Thermostat Heat Setup DIP switch is set to
2-Stage heat, the furnace control board operation will
be compatible with a CTK01 communicating thermo-
stat.
• When a call for heat is sent, the furnace will go
through the Light Off Sequence, at which time the
Heat Current Demand Status will still show 0%. After
the successful Light Off Sequence and expiration of
the Ignition Stabilization Period:
• The furnace control board adjusts to the low firing
rate.
UNIT CALL FOR HEAT ENDS
CALL FOR
2ND STAGE HEAT
Figure 48
• After 2 minutes, the furnace control board accepts
the specific heat requested demand.
• If the differential is equal to or less than 2 degrees,
the furnace control board will follow the conventional
2-Stage algorithm, equivalent to a W1 request and be
reflected in the heat current demand status %.
• If the heat differential is greater than 2 degrees, the
furnace control board will follow the conventional
2-Stage algorithm, equivalent to a W2 request and be
reflected in the heat current demand status %.
• The circulator will operate per the heat airflow pro-
file.
Heating Operation with CTK02**, CTK03** &
CTK04** Thermostat (Modulating Communi-
cating)
• When the Thermostat Heat Setup DIP switch is set to
1-Stage heat, the furnace control board operation
will be compatible with a modulating communicating
thermostat (CTK02**, CTK03 or CTK04).
• When a call for heat is sent, the furnace will go
through the Light Off Sequence, at which time the
Heat Current Demand Status will still show 0%. After
the successful Light Off Sequence and expiration of
the Ignition Stabilization Period:
• The furnace control board adjusts to the low firing
rate.
• After 2 minutes, the furnace control board 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 de-
grees, the heat current demand status will track the
specific heat requested demand.
• The circulator fan will operate per the heat airflow
profile.

Condensate Drain Trap Priming

The drain trap MUST be primed prior to furnace startup.
To prime, fill the drain trap with water. This ensures
proper furnace drainage upon startup and eliminates the
possibility of flue gases escaping through the drain sys-
tem. Please see requirements in Condensate Drain Lines
& Drain Trap section.

Furnace Operation

Purge gas lines of air prior to startup. Be sure not to
purge lines into an enclosed burner compartment. Follow
NFPA 54, National Fuel gas Code 8.3 for proper purging
methods. In Canada, follow approved purging methods in
B149.1-15.
Check for leaks using an approved chloride-free soap and
water solution, an electronic combustible gas detector,
or other approved method. Verify that all required kits
(propane gas, etc.) have been appropriately installed.