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Honeywell TRADELINE Q7300H Series Installation Instructions Manual page 5

2000 commercial thermostat subbases
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Standard Terminal
Designations
A1, A3
Damper control relay. See T7300F Installation Instructions, form 69-1025, Installer
Setup 18, for control parameters
A2
Dry auxiliary contact. (A2 is common to A1,A3).
AS, AS
C7150B Discharge Air Sensor connection.
B
Heating changeover valve.
BM
ML7984 Actuator connection
valve approximately one-half open; call for stage 2 heat: valve full open.
C1,C2,C3,C4,C5
Communication input for T7147.
E
Emergency heat relay.
EB
L
W
ON
FC
Fan control transformer.
G
Fan relay.
GH
High speed fan output. Activated during call for cooling.
GL
Low speed fan output. Activated on call for heat and fan On selection.
O
Cooling changeover valve.
P1, P2
Pump interlock relay. Operates circulator pump in hydronic heat or energizes
conventional heat system.
R
24V system transformer.
RC
24V cooling transformer.
RH
24V heating transformer.
RM
ML7984 Actuator connection. No call for heat: valve closed. Call for stage 1 heat:
valve approximately one-half open. Call for stage 2 heat: valve fully open.
T, T
Remote sensor input for T7047 or T7147.
W1
Stage 1: heating relay or auxiliary heat relay.
W2
Stage 2: heating relay.
W3
Stage 3: heating relay.
X
Heating transformer common.
Y
Cool call.
Y1
Stage 1: compressor contactor.
Y2
Stage 2: cooling compressor (conventional) or compressor contactor (heat pump).
Y3
Stage 3: cooling compressor.
a
European installations must use a safety transformer as defined by IEC60742.
b
Applies to Q7300L and Q7300H2037 only.
Y2
X
AS
AS
COMPRESSOR
DISCHARGE
CONTACTOR 2
AIR
SENSOR
COMPRESSOR
CONTACTOR 1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION INSTRUCTIONS.
3
USE A1 AND A2 WHEN CONTACTS ARE NORMALLY CLOSED IN OCCUPIED MODE.
4
CONNECT GND TO EARTH GROUND.
Fig. 10. Typical hookup of T7300F/Q7300H in three-stage heat and two-stage cool heat pump system.
Table 4. Terminal Descriptions and Conditions.
Typical Connection
b
. No call for heat: valve closed; call for stage 1 heat:
ORKS ®
network connection.
a
a
a
Y1
O
E
G
W1
AUX.
HEAT
FAN
RELAY
EM. HT.
RELAY
COOL
CHANGEOVER
VALVE
Q7300H SERIES 2000 COMMERCIAL THERMOSTAT SUBBASES
SUBBASE
3
A1
A2
C5
B
R
HEAT
CA5
CHANGEOVER
T7147 REMOTE COMFORT ADJUST MODULE
VALVE
ECONOMIZER
5
Function
Output
Input
Output
Output
Input/Output Low Power
Output
Input/Output Communications
Input
Output
Input/Output
Input
Output
Input
Output
Input
24V Output
Output
C4
C3
C2
C1
T
CA2
CA1
CA4
CA3
T
GND
4
2
1
L1
(HOT)
L2
TRANSFORMER
Terminal Type
Dry Contact
24V Powered Contact
24V Powered Contact
T
EB EB
LonWorks ®
BUS
T
LonWorks ®
BUS
M16056
62-0155—3

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