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T7200D,E, T7300D,E,F AND Q7300 SERIES 2000 PROGRAMMABLE COMMERCIAL THERMOSTATS AND SUBBASES
63-4355—48
EB, EB — Q7300H L
ON
W
ORKS
® bus connection to L
ON
W
ORKS
® network. Input, Output Communi-
cations
G F Fan relay. Output 24V powered
contact
O R Cooling changeover valve. Output 24V powered
contact
R V 24V system transformer. Input —
RC — 24V cooling transformer. Input —
RH — 24V heating transformer. Input —
T, T — Remote sensor input for T7047 or T7147. Input —
W1 H1, R3 Stage 1 heating relay (Q7300A,G,H) or auxiliary heat relay
(Q7300C,D,H).
Output 24V powered
contact
W2 H2, R4, W3, Y Stage 2 heating relay. Output 24V powered
contact
W3 — Stage 3 heating relay. Output 24V powered
contact
X
B
b
, C, X1, X2
Common. Input
X1, X3 A, A1, A2, C,
L, X, Z
User defined Light Emitting Diodes (LED). Annunciation —
X4 — LED common. Annunciation —
Y1 C1, M, Y Stage 1 compressor contactor (Q7300C,D,H). Output 24V powered
contact
Y1, Y RS, M
Stage 1 cooling compressor (Q7300A,G,H
c
,L).
Output 24V powered
contact
Y2 C2 Stage 2 cooling compressor (conventional).
Stage 2 compressor contactor (heat pump).
Output 24V powered
contact
Y3 — Stage 3 cooling compressor. Output 24V powered
contact
BM —
ML7984 Actuator connection (Q7300H
c
, L only); no call for heat,
valve closed; call for stage 1 heat, valve approximately one-half
open; call for stage 2 heat, valve fully open.
Output —
FC —
Fan control transformer (Q7300H
c
, L only).
Input —
GH —
High-speed fan output (Q7300H
c
, L only); activate during calls for
cooling.
Output 24V powered
contact
GL —
Low-speed fan output (Q7300H
c
, L only); activated on calls for heat
and fan On selection.
Output 24V powered
contact
P1, P2 —
Pump interlock relay (Q7300H
c
, L only); operates circulator pump in
hydronic heat or energizes conventional heat system.
Input, Output 24V powered
contact
RM —
ML7984A Actuator connection (Q7300H
c
, L only); no call for heat,
valve closed; call for stage 1 heat, valve approximately one-half
open; call for stage 2 heat, valve fully open.
Output —
— C, H, L HSII Control Panel. ——
— O Momentary circuit changeover. ——
— PDefrost. ——
— R1, R2 Low- and high-speed fan relays. ——
— T External temperature readout, T-relay; outdoor thermistor. ——
Table 6. Terminal Designations and Descriptions. (Continued)
Terminal Designations
Typical Connection Function
Terminal
TypeStandard Alternate
a
Some OEM models reverse the economizer terminal designations A1 and A2.
b
Some OEM models label the terminal for transformer common B.
c
Applies only to Q7300H2037.