5750149-UIM-D-1219
Johnson Controls Ducted Systems
33
2.
Once the correct gas inlet pressure has been established, see
Table 16, turn the gas valve to OFF and turn the electrical supply
switch to OFF; then remove the flexible tubing from the gas valve
pressure tap and tighten the pressure tap plug using the 3/32” (2.4
mm) hex head wrench.
3.
Turn the electrical and gas supplies back on, and with the burners
in operation, check for gas leakage around the gas valve pressure
port for leakage using an approved non-corrosive gas leak detec-
tion fluid, or other non-flammable leak detection methods.
Read the manifold gas pressure
Connect the positive side of the manometer to the OUT P Tap on the
gas valve. Do not connect any tubing to the negative side of the
manometer, as it will reference atmospheric pressure. Refer to Figures
39 and 40 for connection details.
This gas valve has separate regulator adjustment screws for high fire
and low fire, as shown in Figure 39. The procedure below is used to
adjust either the high fire manifold pressure or the low fire manifold
pressure.
1.
Refer to Figure 39 for location of pressure regulator adjustment cap
and adjustment screws on main gas valve.
2.
Turn gas and electrical supplies on and follow the operating instruc-
tions to place the unit back in operation.
3.
Place jumper wire from W1 to W2 to R on the furnace control board
for the furnace to operate HIGH fire. Once correct manifold pres-
sure is set (HI), remove jumper from W2 for the furnace to operate
on low fire. Set the manifold pressure (LO) to correct manifold pres-
sure.
4.
After the manifold pressure has been adjusted, re-calculate the fur-
nace input to make sure you have not exceeded the specified input
on the rating plate. Refer to “CALCULATING THE FURNACE
INPUT (NATURAL GAS)”.
5.
Once the correct BTU (kW) input has been established, turn the
gas valve to OFF and turn the electrical supply switch to OFF; then
remove the flexible tubing from the gas valve pressure tap and
tighten the pressure tap plug using the 3/32” (2.4 mm) hex head
wrench.
6.
Turn the electrical and gas supplies back on, and with the burners
in operation, check for gas leakage around the gas valve pressure
port for leakage using an approved non-corrosive gas leak detec-
tion fluid, or other non-flammable leak detection methods.
AIRFLOW SETTINGS
Cooling Airflow Settings
This unit is equipped with an electronically commutated (ECM) blower
motor. The motor and blower are capable of delivering airflow over a
wide range of operating conditions.
The desired cooling airflow may be selected by placing the COOL
jumper on the control board in the desired position A, B, C or D. The “A”
position will give the highest airflow and the “D” position gives the low-
est. Additional fine tuning of the cooling airflow can be done by using
the ADJUST jumper. The nominal ADJUST setting is “A”, while the “B”
jumper position will give a 10% increase in airflow over the “A” position
and the “C” ADJUST jumper position will give a 10% decrease from the
“A” position. Consult the blower airflow tables in this manual for the
expected airflow at each speed setting. The speed should be selected
so as to deliver approximately 350-400 CFM per ton of A/C cooling
capacity. Use of airflow outside of this range may result in diminished
air conditioning performance and may result in lower overall energy effi-
ciency and higher electric utility bills. See Table 18 for default cooling
blower settings.
IMPORTANT:
The inlet gas pressure operating range table specifies
what the minimum and maximum gas line pressures must be for the
furnace to operate safely. The gas line pressure
MUST BE
a mini-
mum of:
•
7” w.c. (1.74 kPA) for Natural Gas
•
11” w.c. (2.74 kPA) for Propane (LP) Gas
in order to obtain the BTU input s1pecified on the rating plate and/or
the nominal manifold pressure specified in these instructions and on
the rating plate.
IMPORTANT:
The cap for the pressure regulator must be removed
entirely to gain access to the adjustment screw. Loosening or tighten-
ing the cap does not adjust the flow of gas.
NOTICE
Gas manifold pressure must be set on high fire before adjusting low
fire pressure.
Table 17:
Nominal Manifold Pressure
NOMINAL MANIFOLD PRESSURE
Natural Gas (High Fire)
3.5" w.c. (0.87 kPa)
Natural Gas (Low Fire)
1.6" w.c. (0.40 kPa)
Propane (LP) Gas (High Fire)
9.8" w.c. (2.488 kPa)
Propane (LP) Gas (Low Fire)
4.0" w.c. (0.99 kPa)
FIGURE 39:
Gas Valve
,1/(7
:5(1&+
%266
,1/(7
35(6685(
3257
212))
6:,7&+
/2:67$*(5(*8/$725
$'-8670(17
287/(7
287/(7
35(6685(
3257
9(17
3257
+,*+67$*(5(*8/$725
$'-8670(17
$
IMPORTANT:
If gas valve regulator is turned in (clockwise), manifold
pressure is increased. If screw is turned out (counterclockwise), man-
ifold pressure will decrease.
MANIFOLD PRESSURE “U” TUBE CONNECTION
FIGURE 40:
Reading Gas Pressure
Table 18:
Default Blower Speeds
Model
Number
Default Blower Speeds
HEAT
Jumper
COOL
Jumper
FAN SPEED
Jumper
060B12
B
A
L
080B12
C
A
L
080C16
D
A
L
100C16
B
A
L
100C20
B
A
L
120D20
B
A
L
287/(7
35(6685(3257
*$69$/9(
´78%,1*
0$1,)2/'
3,3(
*$6
%851(56
878%(
0$120(7(5
,1
:$7(5
&2/801
*$6
35(6685(
6+2:1
$
)/$0(
6(1625
Содержание TM9V C Series
Страница 18: ...5750149 UIM D 1219 18 Johnson Controls Ducted Systems FIGURE 23 Upflow Configuration A0945 001 ...
Страница 20: ...5750149 UIM D 1219 20 Johnson Controls Ducted Systems FIGURE 25 Horizontal Left Configuration A0946 001 ...
Страница 21: ...5750149 UIM D 1219 Johnson Controls Ducted Systems 21 FIGURE 26 Horizontal Right Configuration A0946 001 ...
