Operation; Cooling Sequence Of Operation; Additional Static Resistance - York ZH078 Installation Manual

Table 23: Additional Static Resistance
Size
Model CFM
(Tons)
1900
2100
2300
2500
2700
2900
3100
078 (6.5)
ZH
090 (7.5)
3300
3500
3700
3900
4100
4300
4500
1900
2100
2300
2500
2700
2900
3100
3300
3500
3700
3900
102 (8.5)
120 (10) ZH 4100
150 (12.5)
4300
4500
4700
4900
5100
5300
5500
5700
5900
6100
6300
1. Add these values to the available static resistance in the respective Blower Performance Tables.
2. Deduct these values from the available external static pressure shown in the respective Blower Performance Tables.
3. The pressure drop through the economizer is greater for 100% outdoor air than for 100% return air. If the resistance of the return air duct is
less than 0.25 IWG, the unit will deliver less CFM during full economizer operation.

Operation

Cooling Sequence Of Operation

NOTE: For more in-depth sequence of operation of the Smart
Equipment™ control, refer to the Smart Equipment™
Controls Sequence of Operation Overview LIT-
12011950 available from your equipment dealer or
distributor.
For ZH units, a "Y1" call for the first stage of cooling is passed
to the Unit Control Board (UCB) which then determines whether
the requested operation is available and if so, which
Johnson Controls Ducted Systems
1
Cooling Only Economizer
0.00
-0.01
-0.01
-0.02
-0.03
-0.04
-0.05
-0.06
-0.07
-0.08
-0.09
-0.09
-0.10
-0.11
0.06
0.07
0.08
0.09
0.11
0.12
0.14
0.16
0.18
0.20
0.23
0.25
0.28
0.30
0.33
0.36
0.39
0.42
0.45
0.48
0.52
0.56
0.60
,
2
2 3
4" Filter
0.07 0.10
0.09 0.11
0.11 0.12
0.13 0.14
0.16 0.15
0.18 0.16
0.20 0.18
0.22 0.19
0.24 0.20
0.27 0.21
0.29 0.23
0.31 0.24
0.30 0.25
0.35 0.26
0.02 0.12
0.02 0.13
0.04 0.14
0.11 0.16
0.18 0.17
0.25 0.19
0.31 0.20
0.37 0.22
0.43 0.26
0.49 0.27
0.54 0.29
0.58 0.32
0.65 0.35
0.69 0.38
0.74 0.41
0.78 0.44
0.82 0.47
0.86 0.51
0.89 0.55
0.93 0.58
0.96 0.62
0.98 0.67
1.01 0.71
components to energize. With a "Y1" call for first stage cooling
the UCB will determine if a first stage cooling output is valid as
long as all safeties and time-delays allow a C1 output for
cooling. The C1 relay on the UCB will close and send 24 volts
to the M1 contactor starting the first stage compressor and also
energizing M4 contactor starting the associated condenser
fans. During any call for fan or cooling the FAN output on the
UCB will energize the M3 contactor starting the supply fan.
NOTE: If a Y2 call is present it is passed to the Unit Control
Board (UCB) which then determines whether the
requested operation is available and if so, which
components to energize. With a "Y2" call for first stage
5167515-YIM-H-0518
Electric Heat kW
9 18 24
0.05 0.06 0.07
0.06 0.07 0.08
0.07 0.08 0.09
0.08 0.09 0.10
0.09 0.10 0.12
0.10 0.11 0.13
0.12 0.13 0.15
0.13 0.14 0.17
0.15 0.16 0.19
0.17 0.18 0.21
0.19 0.20 0.23
0.21 0.22 0.25
0.23 0.24 0.28
0.25 0.26 0.30
0.05 0.06 0.07
0.06 0.07 0.08
0.07 0.08 0.09
0.08 0.09 0.10
0.09 0.10 0.12
0.10 0.11 0.13
0.12 0.13 0.15
0.13 0.14 0.17
0.15 0.16 0.19
0.17 0.18 0.21
0.19 0.20 0.23
0.21 0.22 0.25
0.23 0.24 0.28
0.25 0.26 0.30
0.28 0.29 0.33
0.30 0.31 0.35
0.33 0.34 0.38
0.35 0.37 0.41
0.38 0.40 0.44
0.41 0.43 0.47
0.44 0.46 0.50
0.47 0.49 0.53
0.50 0.53 0.56
2
36 54
0.08 0.10
0.09 0.11
0.10 0.13
0.11 0.14
0.13 0.16
0.14 0.18
0.16 0.20
0.18 0.22
0.20 0.24
0.22 0.26
0.24 0.28
0.26 0.31
0.29 0.34
0.31 0.37
0.08 0.10
0.09 0.11
0.10 0.13
0.11 0.14
0.13 0.16
0.14 0.18
0.16 0.20
0.18 0.22
0.20 0.24
0.22 0.26
0.24 0.28
0.26 0.31
0.29 0.34
0.31 0.37
0.34 0.40
0.37 0.43
0.40 0.46
0.43 0.49
0.46 0.53
0.49 0.56
0.53 0.59
0.56 0.62
0.59 0.65
53